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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: admin   总分: 98分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels from one point in spm2p d5m*(c dtosn0h+y qq(o, pace to another. Make a comparison between the displacement and the distance traveles m ,pc 5od0yd+qh(m(2qn *otpd.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the inb / o,st6 l,+usgbk0gjstantaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturerkn j0hv3 8kr4h advertises that their car can go "from zero to sixty in 8 s". This is a descri3 krh8vn h04kjption of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x axis experiences an ac6zi-fqb8w/rv dd: ko1wf7aq5ku 4b3e celeration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the Eastugd5.tuhykm7m ,1g8yio (mf8 (+x direction) begins to slow down as it approaches a traffic light. Mak.18iuhg m5,8kgy odmuf7t(mye a statement concerning its acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the We4 mmu :y: xgshqh*ku5+st (-x direction) begins to slow down as it approaches a traff* xgy5h qks u+:mu:m4hic light. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving zq8c *h2l1cttm 3; bfohwc.7 kekm+(pwith a constant velocity. Make a statement concerning its accelerati k *(m hfc7hzc21qc .tp3+;m ew8bkloton.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of aex ib/b2a;8qn8wu- lj n object is zero, does it mean that the acceleration is zero? Support your answer with i/b28e8 bw- a ju;lqnxan example.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velocity change dixboa qwb-g*p dul3c *g1t j*yed+ucxs(5,)z) rection when its acceleration is constant? Support your answer with an exampl 3cd,t)gqxpj5 s x+ lboau)(1gzw-eby*** cude.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving wilf4, fgikb51 es 3t:loth constant acceleration. Make a statement tk3fegi,ls 4 f1o5:bl concerning its motion with respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its acceleration gnm9zou2 e qqx)wq p-.9evp8o(4 3zve is decreasing? Support your answer with an exa)n8qoqp2 qew94 .goevu xzzpm39 v(- emple.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up along a smook4 vae*0+8 tma nfoz c::l3sh77u cvh8jz/jmeth hill of ice. Make a statement concerning its a7/ n4c3 f kv h*jlaz+jm8evmzoa c: 8h07euts:cceleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to the average of txsjw(prx -hx6e(ck1; sdh (l36f,j lbhe object's initial and fiw -16rljxkx(;p((jfbl ,chesdhx3s 6nal velocity?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start at rest. They both accelerate at the s lh3(t-eedaw8(g a( iwijjg7-ame rate. However, object A accelerates for ta-dwj g3g 8t-(h liiaej7we((wice the time as object B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both startoj8e*yfdn(x*drfm3yv a*.b8 8mi a/x from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance(e j adrd8.xib ya* v8m*fmoy*3xn/8f traveled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is releasesfl4 s z(w(w;t37jvho se f00xd from rest and falls in the absence of friction, which of the followingf ; h3zwfjl(t s(40ex7s0os vw is true concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence +v 1*4im 6x 49k4xcv.qljovornd7wi tof friction, which of the following + v*x nx16k.ooi4 47ilwc4dvmr 9tvqj is true concerning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statem 3n* c.fpueywv:ei+i2euf6q5ent about the velocity and the acceleration when the ball 63ue:wfuc.ni5iv * +q feype 2reaches the highest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleration jusafd.)o j(u7ym7p 4byit before it reaches its highesyoim .u(b daf74 p)7jyt point?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straigh-djp*7/zei w yt up, reaches a maximum height, then falls to its initial height. Make a statement ewpzjd7/ *iy- about the direction of the velocity and acceleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a map5vr4i7tlv.25 vswi dximum height, then falls to its initial height. Make a statement about the direction of the velocity and accev2t5pvdv5l4 r .i7sw ileration as the ball is coming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in h,-)izos dwze4bd(+uf9;vob / u5wy w the absence of air resistance. Make a statement c;-wd+w dio5/yvou e, 4hzbwf(sbu)9 z oncerning its acceleration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying plane. What is her acceleration l*vri kfs v7c0 )pf:i.when she she reachvs.rv07cil kp* i:ff) es terminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed vx nqls1t9 shs7( b8mh(. An identical second ball is thrown upward with a speed 2v (twice as fast). What ish(th7n1(8s m9 s slbxq the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped fro1cbdl zx84g+c 0*vqqsm the top of a building. One second later, ball B is dropped from the same builzc1gx v4* clq+8qd bs0ding. As time progresses, the distance between them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the 84hab ky2c kfw+)u+l( d3wj8,mhsr lvtop of a building. One second later, ball B is dropped from thmw,rhdk( hlu a2 j83vw)l s+48cbfy+ke same building. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building. One is thrown: v3s0fgff -w (p9pfggfx mzv46 i85dy up, and the other is thrown down, both with the same initial speed. What are their speeds whenxf g 5mp d06w3s fvif9: gpz-(84vfgyf they hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from the top of a building. A second brick id5t(in7ko dxvz -pq96s thrown straight down from thep67 d tniqkd5vo-x9(z same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axis. The positiv,f o8d1a5jl;yxg;ve 49htpron versus time graph of thit,ej1 8rg5;pao hyvvf xd94l; s object is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the v2x r+bw4dyt .+x axis. The position versus time graph of this obyw 4.v2td rb+xject is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity-jztl8 z*),.-ld*i fb zlz bau in the +x axis. The velocity versus time graph of tjbzf lblz- .) ditlau z8**,-zhis object is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with cons8frs.jt2urw 0w33 zwytant non-zero acceleration in the +x axis. The velocity versus time graph of this objecwtsu y 2w.r 0w83jr3zft is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position versus time graph giv8n+( c cxf4zfxes

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity versus time graph j0 (50xj4mmo(tc l4;jeaoues gives

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an acceleration versus twfom2sh ,5jb.b4 2dqy ime graph gives

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve inqms2l ) 5c 2fnue;7gtz a velocity versus time graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a horizontal line, the z4k x zxd:3-zcx4* nbpobject c-*4xzz xk pdzx34bn: is

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of lb2,z neje.h:an object is a vertical line, the object isen2 lzb:h,j.e

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a hor08t /op7b)o)e husisyizontal line, the object htb /0o o)si)8y ps7euis

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a straight line ma89 zow. +wfkme9 )xdlaking an angle of 30 degrees with the timeox9mzw e f) +d.kwl8a9 axis, the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 11.0 m sou -wf2lw*0zb,ayw doje6 + ig 4jg)*dpwth. Find both the distance traveled and the magnitbdgewgj 2po6 -+w4 *wzjdf*wa),l0iyude of the displacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still wa3zj)y q70xtmt;z.q2 rw- aucjter. How long will it take to move 12 km upstream in a river flowing 6.0 kmq0;3ryj tuwztzxj q m 72.-ac)/h?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  55 mi/h is how many m,a/9oyj 4fcl lb4g5q61cyhp q/s? (1 mi = 1609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your average speed in order to travel 350 km iqgusv 8rd05 pgvs*6f.n 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min.e ()5ngbenn qvo-p 6ev.s*/sg What ieq* /n6o(sgs 5.evpg- n v)ebns the average speed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. Hod.:f:nan x t /opui1 4hnze/r3w long does it take for it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distan6tana q2v5nyd6/k h:sce that light travels in one year. The speed of light is 3.00 tk anv aqh/6dyn 2:s65x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight road and you look to the side for 4. 19sufh ea:2kx+;h bly0 s, how far do you travel during this inattentive se1ylu ax ;h+bhf9k :2period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor t89aj i eqp+ +mzdcngt z/gxy3co 81e(-rack (400 m), in 100 s, your average velocitqzei mg+ do9+3 8p8e (tcg1y-nxjaz/cy is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south, th(sp 7di q/kvd.en 1.0 km east, then 1.0 km north, then 1.0 km west to return to its startin.7p(/i ddvsq kg point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.jm; 6/xw-c bahifi d5:0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to re5adc:bij6 i - ;hfxwm/turn to its starting point. This trip takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekenhhf)ogfhrocwi2 6t1 7cz*6v3v9uz + bd from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes76f t9ocfw z3 h1vhbuc62o)*zvhir+g. How far is your hometown from school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 k ppzwemv 2: :pp 6;(/oo w.ss,abhjn6am/h and 160 km at 100 km/h. What is the average speed of the motorist for this tripp jz;ww6/paoes, hb(ov6sm . p:p:n2a?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h andzasb1f (oy:0++zay nb m5 c/np 2.0 h at 100 km/h. What is her average 1b:0a (b+fmp zs+y5cn/anozy speed for the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h sj(4m ;+q9fp* lzwmnlnzpd,4 mouth for 2.00 h and then at 250 mi/h north for 75*n+qj pzmzw(f pdl9l;4nm 4m,0 miles. What is the average speed for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorman (the person who runs the u0 (w6ju0tr anlast 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the finwurn a( 00utj6al leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates uniformly and comes to a stop after 10 s.-od9kx. c8ddwo7w6 h l The car's average velocity during deceleration was 50 km/hddckwoowxh8l -7.6 9d. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to m. 2gyspvh1n+160 m/s, at the average rate of 2gmny1s+.vph $15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h 1 j3x;gtg:tlxj7b 4c r g84qzu8;,k 6p lxtlpaaccelerates at the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from rest a-1paha)ezuf m rmv0, 9nd accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then speeds up qi y jmfxsot/t/5q0,q(aef8f vl .1 l*with a constant acceleratio fl. tifqy8e1qfo0m/j / s5aql,v(xt* n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 5.0 m/s experiences a constant acceleration o(pi) /lnmkt+0 4rpap pf lpi+)n (k4pr pma0/ tp$2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x direction) with a speed of 508 am:-3lebfsbojw* ;s.ikdxx2tw 46h 0 m/s strikes a sandbag and px3sa8;lx:-f64mdb2 k* stwh .ij bwoe enetrates a distance of 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on an aircr en7c/ :tov0j7d o+qoaaft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, jqctv 7oo+nod/: 7e a0what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from rest moves with cons( a8v0myqp ;dttant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in a distance o3-5pt cb pmgg:f 200 m. What is its average acceleratig pp:3gc-t5mbon?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoefobmlsq3v; w h2a8o.*o;- mo/cq rpt1s uniform acceleration. During the first second it travels 5.0 m. How far/ ;lr v mf 82hmwq3sooo*btp -a1cq;o. will it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant acceleration. Invygx7qc --f9pitially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it movc gf-yv 9q-p7xe during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and act)s-rh8md b k/celerates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road can deceler-.0a flwlh24grcip e :ate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turns green, a car that has beeqn n4na1,nqk 4. fsq6en waiting at the intersection starts ahead with a constant accelna sn4q1.6ekfn ,4nqq eration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed ofj5ssk.cu 35 1nlbkz+m 12 m/s on the surface of planet X where the j s+ulnck5b.m1z5 k 3sacceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the st rx7rr 7jdhy x j6c5if;,-+aulgr65xurface of planet X wher gxjxrr x75+ ;76,luy-6tdrf5a irjhc e the acceleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a sp 2lr4b) .stnoit*5cja4l2 azxeed of 15 m/s on the surface of planet X where the acceleration due to gravity2naz*bs24lr)tio jt5l4c xa. is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 1ix 0li ,9 a)4dd3 t8fqlxkvw,v4 m/s on the surface of planet X where the acceleration la48 ,tdi ,l3iv0) wq v9xxfkddue to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is u;zim;y mr :yv iv+e0e(sually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how;rvy+0i m :;(m evzeiy far can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity afteryii q))0dru5(j msua 3 3u3i 0( rsjyqd)m)u5a i.00 s?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its starting point in 10 s. W6 7qcl,-z ydi;(cgsaafb)em0 4* nto fhat is the initial speed of the bulgf,(itc b qa ymdl;)64o70-*zcs aenflet?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 36.0 m/s. How l j-dtsswb-d+cmu6du8 8vm4- gong does it take to return 4cdm 8 68bwu-smd -gs+dtju-vto its starting point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a buiz f4 . /aeaasl,lbj)i0wv7b/ylding with an initial speed of 25 m/s. It strikes tha 4 elasjyb7iz 0v.f,wlb/)a/e ground after 2.0 s. How high is the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeri dxg /+46j 70fj kkobk1sby-xjcal value in thgs j/d j1f k0j 4kbb6k-+xxyo7e blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed of 30.0 m/s. (only az u +a 6-2nb )xdf3fxxs.nuq .2.q -u+wwfoolfill in numerical va a . uz2 -+uboxnx 32wl6)qqffsw-u+x.fnad.o lue in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the vel/ub cxk10d4j0rbt3u+pgws 0w rvkz+ (ocity at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocitux8mlv(i i(i 2* /4yslofcy: uy at t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velo4vj1dvcrl6;igq6 a 4ocity at t = 4.0 s?


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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is themf7.whm o *9fb velocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from 0 to 4.0exr; vpjik2re6 0p .2w s?


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from 0 to 6 4dvz ztdsfh(;wv ed3.l 8q7f-.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accelerathr :6 nwhz;-; i5cbq;puf(d jrion at 1.0 s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accell a2 ih i9aye,a;ag* p8(wru5qkagr0+eration at 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the b0wk 5/l+6uabuw5ami average acceleration from 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleratio6 aq*gcovq0)h u q3 4tj nkffs/i;3l,xn from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the displacement from 0 t g6g ds4d9*bjvo 8.0 s?


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