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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 traveg4*b f /1oo8kzg6mgc-zrk1 ym ls from one point in space to another. Make a comparison between the diom1-o8bk1c/6mzkf* r4gg z ygsplacement 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 instantaneous velocvzn 8fd*,sws 9ity?

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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 advertises that their car can go "from zrzt:2h6dd 5*q0s 8n vwz/z exaero to sixty in 8 s". This is a descriptioxda dz52e/z6h *8tr0vz swqn:n 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 axitav.jl z:unmav;x/ ,p hv,s1)s 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) begins to slow down asvvr-c w ;dfa44t701l0xgwa ys it approaches a traffic light. Make a statement concerning ;s0r04fdt7ya- w vxwa1c v4glits 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 direction) begins to slow down -xu 1n wjr;ir5as it approaches a traffic l 5; -xijuw1nrright. 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 wi4pes6u :a ,pu1qj mne;th a constant velocity. Make a statement concernunup4pm1;,sa q6 eej :ing its acceleration.

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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 p bbc8co gma6ows2v).;op ( a8e6oqra4qa:: lis zero, does it mean that the acceleration is zero? Support your answer wioqp6b:q a(w:l gembo8 o a6.co4)a sv2 c;p8arth an 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 direction when its acceleration is co*:kx 8mnz2czj nstant? Support your answer with z:k8jcmnz* 2xan example.

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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 acczgkpw g/2j dh59q.0ppeleration. Make a statement c95.k0d h /wj gp2pqgzponcerning 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 is decreasing? Sub f6rdl7rd/ b)pport your answer with an ex 6lb) f/7drdrbample.

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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 smoothl 5:k gdq)/u*uc) bbuw hill of ice. Make a statement concerning its accqb*)u) dub/w5kg:lu celeration.

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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 ave:;ll8ig/ uib0p o- dzerage of the object's initial and final velociliu:d8b0i-l /oe;pg zty?

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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 wapup9 5e) :ggstart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of objecu:pe5p aw )g9gt 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 start from rest. They both accelerate ejd/iuw9tul w417a5j at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A c7wula/4j ewd9 5i1j utompared 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 of fvkj6wrv * a/w:b s t8dwe57np, 5.bmrlriction, which of the following is ebp a5. *w 8bd ,ls6wnrvv:/mrjwkt 75true 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 ank) 1xy;5xwf;x/ad q-g(ywl y nd falls in the absence of friction, which of the following is true concerning its mlg ;q5f/xnwdx xwyk;yy(1 ) -aotion?

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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 u, m+mc/d3tba straight up. Make a statement about the velocity and the acceleration when the ball reaches the hdb ,3+ ctamum/ighest 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 accele* i xw*qr+im-sg i/um*ration just before it reaches its highes/gi-xi*+ swim*r*u mqt 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 straighp, aoqppqk: 7+xrx23v t up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the balvpr q: ,7p +apx3xqko2l 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 maximumr6(6dtb+ xu s3ex-:b,8ge hgseh p-pn height, then falls to its initial height. Make a statement about the direction of the veloc+nx eex6beh3tsp , gbsrph- -(8dug :6ity and acceleration 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 the -+ j7j-y pj n7q7p j,s6eyatxzabsence of air resistance. Make a statement concerning its acceleration ,6 -aj nj7y-t7+esy 7ppzxjqj.

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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-flyin bn:nd: 9kjq0ng plane. What is her acceleration when she she reaches terminal velocib :n0kjnqd9n :ty?

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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 speedfui t tv2/-1vyu+ke/w8 xrx ,g v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the uv/k8vxrt-1uyxg,w+/ ei t2f 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 from the nu3y 4 ufxhgy70 tvy7(top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance beu7x4u3hyyyv f0 t(7g ntween 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 of a building. One second latea 6as 9,lyrotg 0p4 ntctccv33c(7bz3r, ball B is dropped from the same building. As time progresses, the difference in their sp3c9n t(ts7bz l vo3, apat 4603cyccgreeds

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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 up, ak j7l*i/:ufhund the other is thrown down, both/ l7hj u*kifu: 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 buildings*l:rm k+hm: f op+j /dex 6e05dxtob5. A second brick is thrown straight down from thtxokxdse l5r+ j+6 *:/mhof:pb5dm0ee 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 positioaw7(k5. xeovv m ,kp(fn versus time graph of e,5va 7pf oxwm.( k(vkthis 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 +x axhjfewv t .ch(1t9 n3fn9 czz76cg;of9is. The position versus time grthntz(c3 76; gcocj99w.fffn9 h 1zevaph 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 constant non-zero velocity in thesp9 ,gc,8z ndv +x axis. The velocity versus time gracs v,9,pzdg n8ph 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-zero acceler-)1fvrdnio8u ation in the +x axis. The velocity versus time graph of tdfoui v-)1 nr8his 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 vmy4)efna*lndsj(0 ;xjew* v8 lap x. f/kxn2:ersus 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 versus time komm/tbp *5 1j6 fp1nggraph 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 tims np1b;q gwxyb((iv9y6yr )- x7n.:zaq8 bhh re 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 in a velocity versush8*9 ceuoo, dx1o afn; 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 horiza-4 uf zelhd3jhgj ux(-8c6 cs4e.mf (ontal line, the object 4h mc 4g cf 3e6z-efu(js-hu.j lda8(xis

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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+xmoirkpom7v(b ydm 5:4 ag(n joj 7;9 of an object is a vertical line, the object isimyvg:ojkx rjp(b9 m7nd(o7m 4 ao +5;

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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 line, the objec s6t 4*kxav6cjd+6dj ct istjcx d6* 4jdks+6 6cva

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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 lin: vav*,ygjjb8vlch*3) fkw: ye making an angle of 30 degrees with the time axisvjkb,8::*fhgy w j3cy v )*vla, 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 south. Find both the dx 5 8p gt.a1hpmzij6n+istance traveled and the magnitude ofjt pma.zhi+xp15n6 g8 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*pu :fhecfmwmd5). w , still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/h? 5wuc*f d)f:mp em.h,w

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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 = 1609 m).)7dfoa; )xrqsiids :

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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 travew+s(v af * q en)6a(l8e6;biahttff+vl 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 marwbb,1, pok+uo c lh2d gur8hzz7.s c.n2 r6k3gathon (approximately 42.0 km) in 2 hours and 57 min. What is the avkcs.l2pg,1ok .+ 37bh28zocrh6wdz ru, gnub erage 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. How long does it take foridi)e -d rf0 :u+*hvys 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 distance that light travels innkbd4m2t.k07 sqq;1f+ss om) exfue 7 one year. The speed of ligs of17f2bs msmq0. ;e4enkktx qu+d) 7ht 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 alongf:b2ot5/1d1*o5va5mjlef z w r btnt / a straight road and you look to the side for 4.0 s, how far do you trave v5tze5 5ol: jra tnbf/fwdtm* b211/ol 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), in 100 s, your a .*+lun)guowrverage vew.n+u r*)l ugolocity 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 soqxag /9e 1 wwp.t5-ezfuth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return t/qze9p- f ax1ww 5eg.to its starting 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 Noro lsag0a+ -27od uc.zjm2xl.z th 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. This trip takes 45 min. Whal-+.jsoadlmca. z 2z go27 x0ut 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 weekenwd7fd;v/8ppm5 no ugx/rvs; 8d 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 minutes. How far is your hometown from sch/;o;x mgvs/pp f 87r85wdnvd uool?

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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/h3k sgi5nw(ql1 and 160 km at 100 km/h. What is the average speed of the motowqkng53li 1 s(rist 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 and 2.0 h atgmk 9k.b*8 8v+qp xi r(i/oywe 100 km/h. What is her average speed for the tr 9/robmq p.*(g8xe 8 +kivyikwip?

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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 for 2.0zfsnf k+2/og40 h and then at 250 mi/h north for 750 miles. What is th2nff os/k+g 4ze 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) for tewrp7 wdg o;g*4am 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 final leg of th*;owd rpg4 7wge 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 aiily:g3x o/ 5ynd comes to a stop after 10 s. The car's average velocity during gxli3iy/o :5ydeceleration 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/s to 160 m/s, at the average rata,yrt;guxcr w88 zl: 6e of wrg;rx 86c 8l,:yzaut $15 \; m/s^2$. 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 accelera1qr*xd7ay k-6;avax8 d1zvmates 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 and accelerates at bi2 ogtx sn 9hokk68/vowc:q.+ b9b*v $4.0 \; m/s^2$ 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 spec:-tbpwb1 z 0uadx:nspam8:3eds up with a constant acceleration of b-t s:pu:cwa :bdxanz1pm803 $2.0 \; m/s^2$ 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 experie+glmkpvyz0p qd: ay /7(nu s1(nces a constant acceleration ounvzspm gl 0p(d/q :(y+7 a1ykf $2.0 \; m/s^2$. 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 rightrnh )hu:t0a n(jrp .vzx q-03y (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a dish0zx)nu-arv (jr t:3n.qy hp 0tance 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 aikie6ekg n+: /oor:-qn aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 on+i-6:k qeorie/ gk: 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 constant accelerat2opsgp +68.:tv wxs+nvix5/ 1co uqcy (zn9y oion 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 dista z*xkaz+4ox lot:;psk +0el)jnce of 200 m. What is its average accelerati k oo*p zx;k0l+s4tajx) zel+:on?

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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 unifor 9rti0 )n ten24,c2 lms6zdpws;l v8fhm acceleration. During the first second it travels 5.0 m. How far will it travlr2,t 4 n0i t)d6pms swfneh;cz29vl8el 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 acceleratr hvox0)4w(r5az mz )dzz:r d:ion. Initially it is tramdrzrzvow)h5: 4x (z: az)0 drveling at 16 m/s. Three seconds later it is 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 accelerates u:d+:xnu5a *qm s 2rbabniformly 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 deceleratejk g );5 )o qt02vrvpz9xpkfjaf2*g*p 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 lg8 cm q1bx1s7night turns green, a car that has been waiting at the intersection star181sq c gx7nmbts 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 z c9y,oowwd2we,/2vra speed of 12 m/s on the surface of planet X where92wc,e,2ow r zy ov/dw the acceleration 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 surface of plasj ,0y otlh -gcbvq/+7fr /y1unet X where the acceleration due to gravity thur -/,osv1l0cgyf/y bq+7j 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 speed of 15wsmf n7k)h1z: m/s on the surface of planet X where the acceleration due to g ns7)h:mzkw1 fravity 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 upwawkf ,.+m sf8,k9e cs ypb.l,g 0fhp/kjrd with a speed of 14 m/s on the surface of planet X where the9ff8l mfppg w,.yk/ , ehsk.jk,+b0c s 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 is usually greater than 0.1zxbxe(y06n s6 0 s. If your friend holds a ruler between your fingers and releases it without warning, how far nzy6xb6s (ex 0can 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 o:41vvrn vwkwvr .c7*v f 19.6 m/s. What is its velocity after 3.07 vv:wn4 cvv. vkr*1rw0 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 stoc(nf6c* t:ecb8z9pd arting point in 10 s. What is the initial speed of6(* c p:bfn8czc9odte 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 long do9xc2a et.f)oz j*v u-le 2r 89hajddv7es it take to return to its starting )aj2 lfe x29etvzohv- u r8j.7dacd9*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 thbq ,,v2 4jvifddxhk13h4o ps-adp5/k e top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is th k 541,jppfahvk2d,dosvh34/-dqx ibe 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 n vft5;vux;cl zn,;/g of 30 m/s. (only fill in numerical value in thvvu cgz;f/xtnnl ; ,5;e 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*qmhz ( odr2 :e78cz. s h4vzttnp.sc* of 30.0 m/s. (only fill in numeric:*dr.(ct cehznqzps mv7.to4 sh*8 z2 al value 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 velocity at t = 1.0 ob0dw6quuq5u3 ta6/ as?


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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 vefs, bb,z34r velocity 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 th8 jmh*vs s kpd,pqcyq347 *q+he velocity 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;naevlb 6r ro*/ol8 ,v 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 zf:qzi6 -jxq c3qbd1d-(d mh- 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 b i2t fu.ta o)6 07t3oi7peyasaverage velocity 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 acceleration a az,xo )w-lwo0t 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 rhy .;7 rn 113wbx6vpeolzd83ub ve n*acceleration 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 average accexx juo+i1 v93sv5q xm x+u63 z8ij*brhleration 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 acceleration from k)(ezn;7uvqy5hq .zv0 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 fro )zvh;xgid6 ay*x b tps7+5a+om 0 to 8.0 s?


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