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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: 游客未登录  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 poinrh8uj4t 8qm8t6wbj 0dnpo*)gt in space to another. Make a comparison betb 8)j 08o4*wqr tdnp ujm68htgween 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 am2n27(rr.eqi2g 2()yca cg v cv8ewaun object equal to the instantaneous 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 advertises that their car o.wryftx3w1 7;tbf; g can go "from zero to sixty in 8 s". This bf;f7g3;1. tyroxtww is a 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 axis experiences an acceler8tu nqjbv a9pu(6wj41)pmf r5ation 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 p5px( uf)p s;dmzd-qhecp8( l 1yr j89slow down as it approaches a traffic lightm1ur 5ph(dfp88dxp se); 9p cql(-jzy. 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 direction) begkf ym47 o2g/b69kxaqxins to slow down as it approaches a tx g4mq 2k6yfax7o/kb9raffic 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 constantdmz-m 264h6cn xf3y:nv6ymr l velocity. Make a statement concernin :6m-l263yyr 4nvz fx mmhdn6cg 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 t*.5 / 9qrpigu lz;fgkahat the acceleration is zero?p/zrlg k9u.*qai f; g5 Support your 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 change directil p yll6hoj:6mh - bmc0l7kr+:on when its acceleration is constant? Suphm0y7ph:b :mo r lkl6cllj6+-port your answer with an 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 az3xbh, kwgmylxr,f4*0,yhv 9cceleration. Make a statement concerning its moyg wbrf*,z9xmh3,xlkv,hy0 4tion 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;d ghkr0.,mea its acceleration is decreasing? Support your ansa;me,h.rd g0 kwer with 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, m7cvyf78qopq51l: imgoves up along a smooth hill of ice. Make a stateo c1 78i5f ypqmg:v7qlment 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 condition4 4prguls ,ax5a9jo+ m is average velocity equal to the average of the object's initial and ul4xa g4 prj,as om5+9final 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 acl mnv 6j*um(okr+)(oz2 h8d kccelerate at the same rate. However, object A acc)r(l 8*k v6nm o2hud +jcozkm(elerates for twice 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 start from rest. *-vq7ip -xemp7jv5 lv+ 7lem r 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 compared to7-vpx77viq*ve+lp mlej r -m5 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 res1-m fk/ t1unjzvpl3 u v0wc1w+t and falls in the absence of friction, which of the following is true concerning its motion?3 -um w0wvn/juf1 cp11 +ltvzk

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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 d t25rea qp 9/2p;df,rszi,sifrom rest and falls in the absence of friction, which of the following is true epzsqrf/p,9d,i2 2 ar 5;itds 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 throwi0pxb)p6qgu v 2 h2;nnn straight up. Make a statement about the velocity and the acceleration when thep0 nb6h2nq) p;x i2gvu 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 throwtaxjzd n.:a 85n straight up. What is its acceleration just before it reaches its highest poin 5zjtdaxa8 n.:t?

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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.x;6zplcy d (ib6pt t;zxsj25 straight up, reaches a maximum height, then falls to its initial h;d6 xcbz(i.ts6l; x ptjp zy52eight. 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 falls26hkt kq;7;n-j ks siq to its initialkhq;2k s6nt;i -s qj7k height. Make a statement about the direction of the velocity 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 absence of air resistance. x59bhp 8tmkcv y-58wgo(py( z Make a statement concerning i(c p v5(t8ygky-8xz9o hm5pwb ts 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. Wh stot 11z. k2o.lg2vseat is her acceleration when soe ttg2vzsko1l1 2 s..he she reaches 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 v. An 12yi9.jlz ygf1x hz wuwn5/-aidentical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of j9.z2ui5yy-fwz wl/anhgx11 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 the top of atfkvl t6p8:nj 1/mo c25qwjen jgd./ / building. One second later, ball B is dropped from the same building. As time progrejpg:81tk j5/v. tdcejn6w/n 2ml/foqsses, 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 of a building. One second later, ball B is d cc.tw4sc/z8ev h0b6r ropped from the same building. As time progresses, the difference in their speeds/sv8c4rc. 0bec6tw z h

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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 ;nj42ahba+q l, and the other is thrown down, both with the same initial speed. What are their speeds 2 h4laqbjn a;+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 a9ys(1x8xwuxm5h,8at ozfp j; building. A second brick is thrown straight down p8 oj 1t(yu x;x5hfa s8mwxz,9from the 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 ax-kbyr(2 l)tvpx41i ylis. The position versus t(2bl - l)yrki tv4x1pyime graph of this 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;vb 6s n/diy6phu:va( non-zero acceleration in the +x axis. The position versus time graph vy:i6 ;u ba6 h/(svdnpof 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 vel fsg.j0rq n 9qu.,cn7jocity in the +x axis. The velocity versus qs..r j7u0c9j nf,qgntime 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 accelerx*sx(nyt27cmmjg6m: t/ (im+lomz 3oation in the +x axis. The velocity versus tj :s(min*gy3to m2(l6omxx7 z/ mmc+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 versus time graph g3.pq( j hkcm2gives

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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 gra-ji6h gq3 7)csldk. tjph 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 b*e/i,f u4 aty/z.zxwor qf,9t7 yt2p versus 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 in a velocity versus taae m(z- e-5syime 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 obkuphv*u mp/bs4; (gt 0ject 0pupb 4tkh(g/v*msu ;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 an object is a vertical line, the objectz*h kn82p +hru:t.z 0c:m 3kacylirt 6 iscn*m k:yh 8.0k zr:h pitu36lc2azrt +

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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 time3tvk+:1rn*zcu0 aegkd c-/xl graph of an object is a horizontal line, the object i0v k-xcz*31e d+:kc lutnrg/as

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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 straightd1uke c lhugbc4 4c789 line making an angle of 30 degrees wkhc9l8ceb74duuc 41 g ith 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 ns +bp qst474 iilr8f4north and then 11.0 m south. Find both the distance traveled and the ma i+b7r84pntl sq4i 4fsgnitude 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 will it take to move 12 3vth 7s6sj a(bkm upstre svj367stba h(am 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 = 1609 mzyi5ptc 9d.de 03mcl3)

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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 speef otc698c1 rg kbhzfl/+e3:qg d in order to 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 marathos5 nd+oco 2yxx j/mmju;g2x. +n (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the 2 d o5 ;on2csj xjymgum+.x/+xrunner 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 fol ,t5zn,lo *fhr 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 in one3l-vngxaulyb+46.) f kr0 *bjg rugy6 year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly l6y*yu)-b3.ba v0xr r+l4ug gk6jgnf? (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 str5 l fv7inmg t:zssh+j*e, 3y2m +7nlqxaight road and you look to the side for 4.0 s, how far do you travel during this inattenti7 ls+qh ng7 zjmf:im +se2,tv3x*yl5nve 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 trj v ibo3.b2rpz -7;1;wc/6kktjpkyci ack (400 m), in 100 s, your average velp1r vy/27ji ip-jco bc;k. ;wkzbtk 36ocity 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 Nort f-o*44jna2gcz xhri* d yc+:lh Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km +oa4d r*xfcci y j2g4:hlz-*nnorth, then 1.0 km west to return 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 North Pole. It te-h-v ixe) ;y1r pgi94etn8wa,y0sss ravels 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 takigvi9s s ayx 4ph)ne8;esw-et,y10r-es 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 110 miles. It th;a( a+sxzb6 ynen 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 frosz ayx 6+;(nbam 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 avlpcbtf7 / ue-h0mwt6)erage speed of the motorist for6 )wtlu/empfc0b- 7t h 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 q4k6dvaef2 88h ig u cs8*cj1b9o:vlqand 2.0 h at 100 km/h. What is her average speed f uhd qg 8ajicvo829vq4cb8f*lse :61 kor 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 for 3 uvfs9ye +qt; cgj9rqdz efk5oj8)d4b,7 z0p2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the tripjszyj5cb;fdfz9 g t )qu k 9d3eo,eq8r+7 04vp?

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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 t -qw/z*dodl9che anchorman (the person who runs the last 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 fi *9 zdwoqd/-lcnal 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. The cam,a4az) 0hph/xgx,m s r's average velocity during deceleration was 50 km/h. What was the car's de ),sxgmm a/4zh p,xah0celeration 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 ,/ac vy)o my3gtum0,38gpi)s w6a aye160 m/s, at the average rate of gv)w8pmca6a )/eagimyy3, o 3uy,s0 t$15 \; m/s^2$. 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 ak nj.vfcqr d,17yzy2 b svx6ns1+,r/zt 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 ac 6/0lt0x3 7sglh fdpgbi(abf; celerates 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 withm,tkhb 0. se d431otv1x+fdje a constant acceleration of mj3. fde1d1esk4+bvx ho ,t0t$2.0 \; m/s^2$ 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 vnao1kc.dyl,-sx:/ uexperiences a constant acceleration ofn /y.1lu: s-vkc,axdo $2.0 \; m/s^2$. 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 7tghr53bd6; fb la r4zof 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average accg6rb43;r ab 7ztd5hl feleration, 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 a-/t,n64f:sn xz fftpv u *z,fhircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s4sff:/ntn6zth vzxpf,*,-fu . 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 a 1 )mfosiu3f ;z)jj2wvcceleration 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 q;k1ro:ce4yd1pm b9gto 80 m/s in a distance of 200 m. What is its average accelerationepo:; kyqd 4gb1mr9c1?

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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 r)5own2 77:akncr/ unr c do3zqest and undergoes uniform acceleration. During the first second iz37on :r)u ckr7o2w5cnqad/ nt travels 5.0 m. How far 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 ee3 wt m b,uxxj72r;2yconstant acceleration. Initially it is tr7e2,r 2ux3 wty;exbmjaveling 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 re24 5sesaq .ybt59pk q(eyjm2jst and accelerates 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 decelerd *mo z-p;f j;qe,n+ohtp2*de 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 been wait 9e b2o9rcaqxa;li;+oc w8t5ngl7 eq+ing at the incnca;+9 +;i qoa5l7oeb 9wlqgrxe 8t2tersection 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 plajcaej2w vo,9l 0r3b )enet X where the acceleration due to gravity ic 3j,arb eev2)lj 9o0ws $1.5 \; m/s^2$. 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 planet X duz av4k8 -*ihwhere the acceleration due to graviz-i a4*8 dhuvkty 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 u 6xarty+b q(;wpward with a speed of 15 m/s on the surface of planet X where the acce t(aq ;6y+xrwbleration 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 speed of 14 m/s on the surface . 2wpdvl6f0tmm ,lqk7 g)9aznof planet X where the acceleratioqvk dwz a.0)7g9,mltml p2nf 6n 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 0.10 s. If your f3; .exj 5i j1b jin+z69sdxrc5dcmvj7riend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall.bj c7rndxi 651+ z 5ecs9;xdv 3jjmji 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.k btrgjw-w.x;2qwxz 3kowk ;h1*7gq 2 What is its velocity after 3.00 xjkk . xw -w1 w*37;;brtqwq22kzogg hs?

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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 inei.lmu5 *nbom.p io: 08b)ql z 10 s. What is the initial spei)0.l: ei o*8umonzb.lpb m5qed 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 long d/y5 ,jpot8 shaoes it take to return to its starting p/o pj,h8sty a5oint?

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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 with nl ov8( t,0guowh+0 owan initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the bu 0v (0,wonouo8lg+thw ilding?

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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 u- bz* n:bocgj3p with a speed of 30 m/s. (only fill in numerical value in the blanks*bon3czj:- b g)
(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 wit1o -/o(clkkqrn2( bo(tiaj-eh a speed of 30.0 m/s. (only fill in na-k-(k(olbq 2/reoijonc t1 (umerical 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 velocitw e2sa n.9al8 85ty/hls2eybey 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 th7c dbcwg0l)4 le 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 the velocity at t gj s g q3xft3.it db(e4f;b/hd504s:z idf9pl= 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 velocitwf annqkhg:- )5ca(30cea. muy 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 t8koj f/x;lu +oir13b5o8 en eao 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 mqip tgw/cl;w/(1c-m1+p/g mf1 b5qucl,wwm 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 )hykqtrf c-9(oudbrx/b7ls 6(+p )g qthe acceleration 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 3.00lqo5: dga bj2 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 0 to 5.pj t7e gh*;:,vda nm4p1j.csf0 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 a:rwy()wz /n5do qhmuhw 1*2vqp2g0qp verage 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 displacegkfd;,ns ; 8q2:nlj7wi d ag)ument from 0 to 8.0 s?


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