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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: physics   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 auac91 0x qizitx a:m,uax:69mnother. Make a comparison b i,ucxx0i mazx:1q6am9 atu:9etween 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 instantaneous velocity?eq/8 *3kb9 jfre0 wkvp

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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 ad)p h-k 0mnp jeu:ico2*vertises that their car can go "from zero to sixty in 8 s". This is 0mec*)n phop 2ij:-u ka 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 axjjmgb 8 g,azy:m4y9d.is 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) beginsm5pz+vsw/a c 6 to slow down as it approaches a traffic light. Make a statement concerning itsz c+6 mp5avs/w 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 (-xbhq f8m.m:i 3zvcxt1l rs*-.s direction) begins to slow down as it ap8 .3m: qmi.s xzsb*hc1lrvt-fproaches a traffic 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 with a constant velocity. Make a stqo 89ne2q h h,c qfk90m niz+vt:t(s*tatement concerning h,8h o n2mvz:ts*q9 c90enkt iq+tfq( 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 is zero, does it mean that the accelerationm* npy-yph-kx7vw)h d dv)/i1 is zero? Support yourmiv)ypv1h --d7/ yphxwn)k d * answer with 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 chf yxsluy7bm2 b1u4-7jange direction when its acceleration is constant? Support your answer with an examplex 2jm7 by7ly1f4u ubs-.

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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 con i*k6n1mtert ;m5(ippdwf pn8*+iho- stant acceleration. Make a statement concerning its motion with respect 1*t;*emh-wtdip p 8irnni5 opm6k+(f 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? 5teu bwot)( ,f Support your answer wie,oft ()t5wu bth an 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 along a smooth hill oy4gsv.,ds x)of ice. Make a statement co 4yv.xdg, )ossncerning 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 :f p4pbhsbv68mla ove:+ k4w;the average of the object's initial and fi6 boa+4v:v w8: h;pk ps4fmelbnal 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 afj3 9iu)thy hiupr5v( z5h q1/t 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 object A comparihtrz9 qhuh( )3iy fv5p1 u5j/ed 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 re +:v /+pjifclxst. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A comp+c/lf +j xivp:ared 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 inn/ m,ipr9h5f*qy 6wrr the absence of friction, whichp6ny* /hrirq,9rfwm 5 of the 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 from rest and falls in the absence of fricts3sb upzi:n5, ion, which of the followingsn b ip5s:,3uz 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 statement aboutr 9 ):lkhb2r6oohwxo5 the velocity and 5hl b 2)o xroh9rkwo:6the acceleration 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 thrown straight up. What is its acceleration juzn.h gf5+mh2ipwl *j1 +v jht;k/ yx1bst before it re .w+;1+l5jnz1yghxhm/f jtipkh2b *v aches its 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, then falls :tk-km w bd.f:to its initialbd-:ktwf: .mk height. Make a statement 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 maximum height, then falls to its2izbiel :d+ p:fbh,eq :r37in initial height. Make a statement about the direction of the velocity and acceleration as the ball is fen3 :,+:bhzp edqbir:7 2ilicoming 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 resistance. Mag:.w-q9 pxx wxke a statement concerning its :-x qxgwx9p.wacceleration.

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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 ppynn9 (9v,zie bwe1 o;lane. What is her acceleration when she she reaches terminal velocit9 z1pen bvo(we;n,i 9yy?

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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 ba1zb,g6yobt(6 f8q2by bb s2evll is thrown up (8gfbobqzyyb 1ebs 6b v26,t2ward 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 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(:0ixfx c 1,qn8upcnp the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between tfucxx0 ni:q1cp,( 8pn hem

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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 later, ban1*f :tau 1k-btafl)all B is dropped from the same building. As time progresses, th1faa *ku a)bfl-1nt:te 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 ;4q q yv/e3ht0+yn d)-biplsf top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speed;+t)ln fpdve4q-bs yq0 yih3 /s 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 -krg)8u*gwxat a+ddww c9i r6+g2o 7 (0pquqabuilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the twouqg8k0x9p -7qa d)iwg dc ratu6*r+2 owag w(+ 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 buc3af b z39j+1ju 9lpe ixm03constant non-zero velocity in the +x axis. The position versus time graph of this object isbuj3pu9cj 331me9 lz0 f+iabx

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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-zerr(e 8 rh1/g:+z9ezu;f 4roi7uvp vzozo acceleration in the +x axis. The positiourzpz87( ; 41/hv: oez+ e uirzvgrf9on versus 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 con 3rz:g;-ohte kstant non-zero velocity in the +x axis. The velocity vers3k; ht g:e-ozrus time 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-zero acceleration in the +;(78, vxnkwvlf*c i f( xc(qiex axis. The velocity versus t;( fwxic8evifkxq, *v7cnl(( ime 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 versul 5 8bj v1q0zvx1vuji-nhn8* 35ndwqgs 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 graph g- u0meyi4qew g9ry74 tives

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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 versusf)s6 d .*mfdeopesz4- time 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 hwo g q3x 50 uqyj*,vu880orgqin 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 obz5 rvh s776aqjject ir5q7 a7v z6shjs

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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 g()tmzdjq 7tlm ; zpb,f6vvu,tm)34vk raph of an object is a vertical line, the object ism v)td4tlpb);uzv,3km,vmj (zft 6q7

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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 liwcvxk .cwhw+ ,,blfe*du,65or. v )x ine, the object c.c ,iu.w*b)drwoxf hv 6vk xe, w,+l5is

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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 nu44jyv)bng .straight line making an angle of 30 degree )4ugj.nvynb4s with the time 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 south. Find both the/gx* 1yk judb/ distance travel/ kg1 *by/djuxed and the magnitude 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 water. How long qd; ih+ yxu8bl,q:,abp*zmjaq t550nwill it take to move 12 km upstream in a river flot8 0: , qm,lp+iznb 5qb5 adax*;qyjuhwing 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 mwf ggw k +:9y vs3w7sn0ye,8zl/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 in 5.15 hna;9s1zzdwrmi zy*oh phh7.a6j; ; p/?

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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 hoz6 4is) l:lfuhurs and 57 min. What is the average speed of t:zlil 4fu6 h)she 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 takeufqaxl4ns )x)2(7zkgf35b mpccfs 0- 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 distance zbo 7pgn.z68t g33 vblthat light travels in one year. The speed of light is 3.00 x 108 m/s. Howb6 8l oz.3 nztv3gb7pg 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 /q(fo gvryt04w33v hoand you look to the side for 4.0 s, how far do you travel during this inaqov3(gvw f0o4y h/ r3tttentive 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 arou;8if9fyse0;1lp swtond an outdoor track (400 m), in 100 s, your average ;f90 w i 1e8pf;slystovelocity 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 c8p5gx(wlew;tiyz. ) 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 av l5 yi.tp;z8)wxcgew( erage 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 1.0 km south, the- hsb(0wia,nfphw5 o* m7*oip n 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. Th(b o-hpa w hipm,70wsni5 of**is 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 gf8 slhr5kt: /ky8nvp +u50lh55 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 v:r/ f85lk0gh nht 8klu+ ps5yis 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 km at 100 km/h. What is the andb k:+ /q2iyfc-)js mg.5zcbverage speed of the motorist fod :5c+mq /f) bsynb.zkcj gi2-r 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 at6jxq 2m fxjkf025f7.r 5grdqz 100 km/h. What is her average speed for the5jgm2q 6j f0x rf57xz2rq.kdf 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 for 2.00 h and then at 25cjtgqa+gq l:ow u ls)92oo l;o82bx690 mi/h north for 750 miles. What is the averagoxtb;l l)j 292ws:u9g lq + qcooo86age 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 *w eara8yy*ym z1o 1(steam 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 ofaw*r(8 1yza1 sey*yom 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 1jno w+ ,aa5g+,(bzq 9nym9 pcpekdi 250 s. The car's average velocity during deceleration waspcw95bm zy gk+ a,eqoa2pdnin(9 j5+ , 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 fr -;a;he, 4nb5(doznidquz+ro vsw)6ea4kv*rom 100 m/s to 160 m/s, at the average rate of o-*n5 d6 vaanukwrs) rv;(bqee4+i,; ohz4dz$15 \; m/s^2$. 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 of )q(aj(nibynii * bzeko(o: w.3ta- f0$2.0 \; m/s^2$. 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 accxb8d wm :cbus10sv xh x/3cj;3elerates 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 then1+ g 8aba/3fw y a1e w,b4ofltweh9ht* speeds up with a constant acceleration8/b ,4tfe of3wagtwal 1haw e1h+*b9y 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 velocs9h0t*ee 3uve6n fh;wity of 5.0 m/s experiences a constant acceleration of f390vhw s ;nhe*et6ue $2.0 \; m/s^2$. 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 50yv )-ix k1vmtb22,gba 0 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average acceleration, v) 2t2ayki b-mxgvb1,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 ai6 wiil)hffdh* u.y yh(- (l,rxrcraft carrier. It reaches a speed of 42 m/s at the end of the catapry-.(x dwf( h, h6*i liuyl)hfult, 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 witu1m nh 0nd+z+kc h-h6hh constant 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 itsjk+m ;8oj t4orq,7pt14 rgzoa average accele7okora1pjg4 ;m4j qtr8,zo+t ration?

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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 andw.b/ p:k,ekoe undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third ,/ewp k koeb.: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 acceleratioqz5.( ni mt3zvn. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move durin5viz( tm .qz3ng 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 uniformly ukv0d :w+t+ir 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 dryh*+6b vbgll3zq;y mvii26gc 5 road can decelerate 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 sis 3(d8 )jkuaturns green, a car that has been waiting at the intersection starts ahead with a consuk(is)ad s83j tant 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 m5(0mj8dak/fe tg sc/l/s on the surface of planet X where the accelerationlm0fcjad/k(e t8 g5s/ 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 hq30j4.evj z be,:xigof 12 m/s on the surface of planet X where the acceleration due to :j 3, gh.biqvz0exje4gravity 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 15 m/s on the surfacl l dox*wj4tsahke1/uye+(j 8 *kn1 9de of planet X where the acceleration due to 1tw +sk/h89j(*dln ey*x aj el1d4 kuogravity 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 upwardh s+zu/hg+ z7isn8l 9w with a speed of 14 m/s on the surface of planet X where the acceleration due to grnhz+/g 9ul7shiz+8 s wavity 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 0.10 s. c0 f -j:k6th lxt zrg,hqm;ienk5e 81* If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you ca:0nmxl -ir fqt 1hhge6,5e;tjz8 kck*tch 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 .u6k2ehb r yskch74x s .ni(0dat a velocity of 19.6 m/s. What is its velocity after 3.0x2 . h 0sr.i6sdu7bkkcnhy4e(0 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 f p:qm*30olfxb 2eg 8ureturns to its starting point in 10 s. What is the initial speed of thef30*8qxmu:gl bf o2pe 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. Hx5;vj6 9 oo8d-sl7rmtrkcx/r ow long does it take to return to its starting v ;rtm j8oxsklo7r-5 9xc6rd/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 wiywxd: yxefmp 0+px80m/ 1 c6kuth an initial speed of 25 m/s. I:1 pw0mxk8/fx 06y+ peucymd xt 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 straight up with a speed of 30 m/s. (only fill in numerik4zl i7 (8nf*kmv .fctcal value in t*z8.ct4k (7 fmlvifkn he 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. (oygu x3 nclh+u5/kj8y3nly fill in numerical value in the blank)8/gj +x 3ylu3yn5ckhu
(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 v4iqz(c e2+9 wc;uj1eih /fj qthe velocity 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 veloci4pem7hm5:emb o )cl t:ty 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 velocip i wmai8ui xf1/)dimy73i;z3u.+gaety 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 ve 9 7jee2jpm pzg4+/lequdjr xm g;/5(alocity 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 5*bdwie39uvohe)uc ; the 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 rp7q uchf+82naverage 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 accelru a+6c8 vbyj9,msv)a eration 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 accelerationeli)5ck(/g/ hg a5eeu 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 acceleration from a k 6j+q:fun,k vx;vlm y259il0 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 av6e92.u r2p+g pwi ldjierage acceleration 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 to 8.0 qf:fqrv2y l l 1.s c6rh+kf,8ms?


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