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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 space to anothercnd htud)v pw,* -y:p5. Make a comparison c5np wt:,* uhpy)vd-dbetween the displacement and the distance traveled.

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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 inst, u0 qdxq8m 5/on 7s4bvu5nygzd6,vepantaneous 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 manufacturer adve+;ah3xs,adol ted.7wte 0dg *rtises that their car can go "from zero to sixty in 8 s". This is ahl+twgds a*0dt,eeo ;.7a3x d description 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 ae+ bxxhq*e4ea kc ,16mxis experiences an acceleration 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 East (+x direction) begi h 3x .wnxf2wpuk-2k7h 3akt4wns to slow down as it approaches a traffic light2f2u khx4w3tpwn kwx7a. -h3 k. Make 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 West (-x directio*ixni4moo)3 s hjo56s (xe:tl n) begins to slow down as it approaches a traffic light. Make a statement concerning its accx 6)3 nt: j(o*xh osiile4so5meleration.

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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 with a constant velo13 y;*dg qbiwvcity. Make a statement concerning its a1*gydbqv ;wi3 cceleration.

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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 an object is zero, does it mean t:dhqqe;ni yj**cri07 hat the acceleration is zero? Support your answer with an eiq*ey0 qi d:*j7 ;rhncxample.

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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 direction when its acceleration isod 8:2genpr l89 lcu0y constant? Support your answer with an exampl09c8ue8 d 2lg:ronlpye.

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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 with constant acceleration. Maabhka :/( (t73dp uh/np9nsx r9;paatke a statement concerning its :ttrup/h3 d9 7 /xp9aah b pnsa(;(aknmotion 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* dd0 uq8j5o*todp3 pd acceleration is decreasing? Support your answer with anod p 35utdd8od*p0qj * example.

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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 je9-+s y6 y8lef9kt,fbeair8 along a smooth hill of ice. Make a +69e ,9ejyi8k8tyfbsrf l- a estatement concerning its acceleration.

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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 the object's i b)nt+l p,jda.qfj)a fb*ed06nitial and final vepabl dfj )0,)n6a *dq fj.t+belocity?

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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 res g/z d5r4kfo;at. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objecfk 54rzo;agd /t 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 start fromqrz9l ep g*9.m 8gavp) rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What isgg*9e.q lzvm9par) p8 the distance 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 released from rest and falls in the absence of2zrvpmecxy::ob, w(hsl: 9rr2x o vq,0, 8xwa friction, which of theh,o:bzxxw:eryv8r292rp,asq:mxwv o ,( c0l following 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 frx:/4 j yn4gtjpp+ xpr6om rest and falls in the absence of friction, which of the following is true concerning its6jx4x4/ rj+npppg:y t 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 statement about the velg/6a ;qaa 1 k1kie8au8(eue 62kc bzzjocity and the acceler /z2cqzu( a8a1 ;ea kei1jub6kakg8e6ation when the ball reaches 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 throli6g1. g- hiviwn straight up. What is its acceleration just before it reaches itii6gh- .1vg ils highest 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 straight up, reaches a maximum height, 77xn 4w52ji no.evyhqthen falls to its initial height. Make a statement about the direction of the velocity and x.woqjye4h i5nn772 v 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 maximum height, then falls to its 2ogt( zg*erjcd.o 0,6 iv ck)hinitial height. Make a statement about the direction of the velocity and acceleration as thevo6reg 2c,0ok( z)gh.tjci d * 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 the absence of air rekk4 fyac;os;ko n(ui/oq8. v1sistance. Make a statement concerning its aku4 oc( k.y/o8v s n;ak1;fioqcceleration.

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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.-pp xl8r6r kp rfq(ts0(27d 0q6imdlr What is her acceleration when she she reaches terminal velocilrmr6rp ldppq tdk76 2rfs (8qx( 00-ity?

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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 v. An identical second b .n:ngz( qj)yke hpuuk+/0xx8all is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second bal x/uk. 8n0p+jqzygk)xh:e( un l 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 from the top of a building. One second 2h z0vp 6ykxo9p+1o5soa+daklater, ball B is dropped from the same building. As taz9kyks 1o 02xpov ap++6 5hodime 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 top ;x a0pzh)cid9of a building. One second later, ball B is dropped from the same bu9p c ixazd)h;0ilding. 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. st5y;1w gv3zj One is thrown up, and thj w5yz1g 3v;tse other is thrown down, both with the same initial speed. What are their speeds when 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 hk di4w451r1ayyb0d q building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance.i 4504dw1qryabd 1hk y 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 axizhspmx 8oq;)/jd;m ;ss. The position versus time graph of m;mj)d ;px;o/qsz8 s hthis 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 constan 0 ni*t*7t/5c o*gakok ,jjviqt non-zero acceleration in the +x axis. The position versusvj5c7 j ikti*q, ano/o g*k*t0 time graph of this object 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 cons:xyci75(5p* hu. se mxk) bjhwtant non-zero velocity in the +x axis. The velocity versus t*e:x5su hp.x i5c(kbwh)my 7jime graph of this 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 constant non-z0)h9ll+rii 9o lfsp. aero acceleration in the +x axis. The velocity ver9hlo)l srf 09li+iap.sus time graph of this object 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 versuq4+fi,xd moz ;()-s2dnahg s ts time graph gives

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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 vefp21a; gid ;iarsus time graph 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 time graph,**ja ;nkur4xp hp3hg- yvz4y( -usew 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 in a velocity vn. e ,dstd5vc4.* 1 3frio7ws(mpnhg oersus 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 v+q qpv*5g 4hbtime graph of an object is a horizontal line, the object b4g 5qpqh *vv+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,3qcojmedfcy d* e4c2ueh41 7 graph of an object is a vertical line, the object isch y23d*j14e74fdeeuccqo , m

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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 horizontal lw:k0tkvz, jxh9.,p5 xig4p dr ine, the object isx.:pk,w4 0t5r, dpi 9hxjkvgz

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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 making an uq(bp895 d/x;iozqbh9ow:mk angle of 30 degrees with the tzwbhm/xuo;: ( 5idqk q8o9b9p ime 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 q n oq4a)b),to11.0 m south. Find both the distance traveled and the magnitude of the disp, nbt)q 4)qoaolacement 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 water. How long will it take to move im96 ghd b- 1r+cflc8f12 km 6bc9h1dlc r - m+f8gfiupstream in a river flowing 6.0 km/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/s? (1 mi = 167 d-cl:6ixnpnq ww/v34k 3 s qdbymk(409 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 stp u*sesy; 6*3wt)bs 04accv travel 350 km in 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 (approxib q z2sm7bkg tl,g-4:imately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner i-l g:kmg74iz 2,btb sqn 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. How long does it take for it to travel 400 km?mbwep6j5, li qvpjx:v,j 7,(t

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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 distance that light travels in one year. The s y6pa+8j ge5jje+l3 . lwyt;nfpeed of lighe+fy+ny ;jp .6wte gj8a5ljl3t is 3.00 x 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 strai b60auq3rc;bu-p0n 7 ,spmc uph;sqb+ght road and you look to the side for 4.0 s, how far do you trabc, b0hrqsp;buqsm+u 7n36u a;-pcp0 vel during this inattentive period?

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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 track (400 m) b yi5jfcgsmd/9 04ln :i5+puj, in 100 s, your average velocityd5/ui bg:y5li9mn4sj0jfp c+ 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. g1of p/u3md2q It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's auo2m/p3d1 fgq verage 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 ef s l4 ldax97yjpvot86kp*04 at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. Taxj46ep*dos0 p 7 tly984lk fvhis 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 weekend from school at 55 mi/h for 11cb v4wlib5neryi-5, p sj-,.43sg dy n0 miles. It then starts to snow and you slow to 35 mi/h. You arrive home a. j4p4 3- l ,bsdcnib 5irvn,-ywes5ygfter driving 4 hours and 15 minutes. 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 km/h and 160,x3ru8z q4 g(;jyjfdge , mlc) km at 100 km/h. What is the average sp)d(ly 3c qxj,egju4,zr g;8fmeed of the motorist for this trip?

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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 an( dae3g* p+em0+ntptdd 2.0 h at 100 km/h. What is her average spe em ( dn3tptpdag+*e+0ed 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 south b h*da-.lyw+0jk 02nqdy 5bdafor 2.00 h and then at 250 mi/h north for 7ddd 2jh wynl+ka-. b y0a5*q0b50 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 last 100 m) forsmn9yp ((yl+p team A can ruy9(ms (+pny pln 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 final 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 sw2olw y9kk 8g( yhbq6+(jz6an . The car's average velocity duringhlz y6 2 awj8goywk qk(6+9b(n deceleration was 50 km/h. 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/bz-hrqy70i9s(2 a ve.rlt4 v b ,:dhmls to 160 m/s, at the average rate of z4 . m9liv2dt ab0-,er(7y:qhsbhrlv$15 \; m/s^2$. 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 accelerates at the rate oal t0 k(g1pb,;;/5hppzio r lvf $2.0 \; m/s^2$. 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 and accelerates ai;ooj/r6a. uut $4.0 \; m/s^2$ 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 lc) gpxt/t :4tthen speeds up with a constant acceleration pl4 xc)gtt: /tof $2.0 \; m/s^2$ 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 f jejlyn;5tj/fuk9b:.v a s3 ,m/s experiences a constant acceleration of yj;nuv9f a s:j/ l5j,et3k. fb$2.0 \; m/s^2$. 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 horizontall)-auv,a;*gfet 1 rcc py to the right (+x direction) with a speed of 500 m/s strikef*trpv1,a;c c-)g uea s a sandbag and penetrates 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 launc, iw5i*gm;gl kt. plw7hed from a catapult on an aircraft carrier. It reaches a speed of;tiw5 l. ,gmkwli *pg7 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what 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 ivl bo-07tq0qa+ .ahtconstant 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 of 200 m. What is ix4fnovau+9e ; ts average acuvf+an ex4;o9 celeration?

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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 undergoes uniform acceleration. During the c43cso)1-e 2(twqf ncq1mo4vj pa(s hfirst second it travels 5.0 m. How far will it travel duringj3cn4tv2s 41qo -acf ehmos)c (1wp( q 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. y4xtysr9n zrk/q; h1( Initially it is traveling at 16 m/s. Three seconds later it i4 /x(hrnrqtzy syk; 91s traveling at 10 m/s. How far does it move 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 ac tif* yuv rf-(y5a kl:o++l:wacelerates 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 decelerate n:(ahx uhrz b bbm(gr -8)+xv)juxg9,2xvch/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 been waiting at the kp: broijhh4u5+rtn u/l)88oe;6a g d3su+kjintersectdk+ /i les6o;jr5khu3 4ut +nhrj) 8uabp:8ogion starts ahead with a constant acceleration 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 of 12 m/s on the surface of y r1qj8v)kao- planet X where the acceleration due to gravity8yoq- 1a )rjkv 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 spe,rfmg)y o9ufu:eb: d 2ed of 12 m/s on the surface of planet X where the acceleratiodo rfmfbug,e:: )yu92n 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 spe,z:aq -or+ 5livpz6j ied of 15 m/s on the surface of planet X where jzzv: oi+p5 aliq r6,-the acceleration due to gravity 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 speewivt .vm ,y9 7ggmwra *ri*y)) a:)mbrd of 14 m/s on the surface of planet X where the g.iwgm*)w) at ,rv7 )m9ry:rviaymb *acceleration due 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 i)c6dvp +mjr 90uqr 7vms usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the 9+6udmv) 0r cpj rq7mvruler 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 ay6s,n61rnqg. qps u/ jfter 3.00 s?.s6/p, yjgrus qnn61q

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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 u hz0/gzk7a7ou*iv):cjr1t s s. What is the inucojr z ta*z:7710)ihsvk g/uitial speed of the bullet?

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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 lo2dv4ci) *bziy ng does it take to returnci vyib 42)z*d to 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 building *)fjj0m4 j mdmq:gt3)ai5cbv with an initial speed of 25 m/s.abcf*5imjmv 4) 30tjg:)djmq It strikes the 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 straighk(yl.pk+ nn:v-eg i vkmjax)09v +hn8t up with a speed of 30 m/s. (only fill in numerical value i xha+kn m(pevn. kklvg):+ijn 9y80- vn the 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.cgt, a.u jm7a p*.jkx2 (only fill in numerical value in the blan,jxk.gt2ja macp.* u7k)
(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 velocity at t l be(0kct u,p)iyt,zkb,e/p5= 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 velvne7r z 7zc3t-e-ndo5ocity 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 velocixzw 6(z4d z+toty 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 the velocity at t = 55om zm-86rn iu.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*-lwud i+n;t w4 icoi,;:tdv e average velocity from 0 to 4.0 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 v+9mg(ggcr huginzy +xwkd1.w c:-: c, elocity from 0 to 6.0 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 ahc0j,h 7ujl 5l+z4 oancceleration 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 acceleration at 3.0 s? dc*g4q-ab3ji


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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 average acceleraj -y(cv- oie l2d-izkp8d,s p)tion 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 acce+8ml d /byvdg(y:v;wdi7kr- y leration 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 kez91o f3ay6s uu-0ijo 8.0 s?


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