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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 travelsc xv:2trb4+e 45cbz9k i+o-wg.ni qpf from one point in space to another. Make a compariso pf52vqx9g:ot+cw4b 4rcibz en.k i-+ n between 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 instr4,m95,)pmatpg xbw2 d :wagz antaneous 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 can go "from zero to u;wdogj6 oj0(sixty in 8 s". Thiu0(6 odgj;o wjs 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 axis3)ywr;d*o . bl8zbjjb 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 acvpivqvo*-5-u(zji / jn mf,-s it approaches a traffic light. Make a statement concerning its acceleration.(-cju,*f/z-pji v 5i onvm- vq

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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 Wes uz.1(dmj gcv.t (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its a1v jcdm.(g u.zcceleration.

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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 withic) pupkn0un r,t5v*3d* jti ( a constant velocity. Make a statement convt ci3rdjp*t,(nuk 5n0)i pu*cerning 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 iwtd i0q5gt9 1w dcu4d*kz5v2zu.aq8gs zero, does it mean that the acceleration is zero? Suppqg8wu1. t 50qcdid5atwzzvk2du 4g*9ort 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 directiosksd3 gbt/ +o:oy(oimv(n)i -n when its acceleration is constant? Support your answer bvioo:kn/i)ds 3(g tm+ s(oy -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 accelerati56y o6y rjgiir*jlsm)2 zj6rpz,h+ ,zon. Make a statement concerning its motion gz ,)jhzl66y m+zr j62yir5 js,i *prowith 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 gitu: m5stk ,hmckh-2s3 29 skits acceleration is decreasing? Supportm kk s23hks :mshu2igc9tt 5-, your answer 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, moves up alongsy9mj8:)l l pn-, pjwb7xfgp4 a smooth hill of ice. Make a statement concerning its accelerati, 9g b m4-jwpjs)7x:fnpyll p8on.

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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 f 3)jn(,b,avj9wv sbmsu62 b 4j0 r8yxd2nmsvvelocity equal to the average of the object's initial and final velwx 832jv n94m0bmn(ajbv6 v,2 syu s,bsrd)jf ocity?

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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. lujh7 rz( 8ahqns0qq.m7 hp 4: They both accelerate at the same rate. However, object A accelerates for twice the tpq qq4(hj0.hla7:hmrn u7z8s ime 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 resty-( dm x7nm)om. They both accelerate at the same rate. However, object A accelerates for twice the time -( dmy7mnx)moas object B. What is 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 of friction, wy3ihm p3;qa e23ed*c hhich ie3dh3qyae m;*p h2c 3of 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 releasedp t 3gjgbcj,,17d6o(nt4d mso from rest and falls in the absence of friction, which of the following is true cd7 ,togb4j1j6tgmps,ndo3( 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. /dvcj;bq(. )6 mf oznu Make a statement about the velocity and the acceleration when the ball reaches the highest poq unzomj 6)c v/.(;bfdint.

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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 accelerattugj,y 1a) t,yion just before it reay1g)utty a,, jches 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 maximum8 omd,zg,z 3co height, then falls to its initial 8mo,z ,ozg 3dcheight. 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 +takeu hnr-7f* l+m1qfcx ,r6up, reaches a maximum height, then falls to its initial height. Make a statement about the direction oft*hra1q6k+ mfn7 l f-+,recux 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 do/ uinqaggo8- scy0 +:pwnward in the absence of air resistance. Make a stateme/nusicqa80 +-p o:yggnt concerning its acceleration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying plane. What is her51eco/t 9edyx acceleration whecte 1doe/59 yxn she 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 uf 8 cf6ql --ra2:k6wlcxpvh: a speed 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 second ball to that of the first ball? (How malrxffaq: 662-wv cuh 8k-:clp ny 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 froc7byjbqi) rxuwz. u rh51: 9h(/ mdy/em the top of a building. One second later, ball B is dropped from the same building. As time progresses, the dryy:r19hbu h cj75mq// iz)wu( e.bxdistance 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 buildbor): 3 bkob4 z.uj9sfing. One second later, ball B is dropped from the same building. As time progresses, the differen 3 ou.jb9)4b :zsrofbkce 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 takgo)bfjeg:2 d3h f:8op of a tall building. One is thrown up, and the other is thrown down, both wit3oej fb8:gfd2:hkg a)h 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 building. A second brick is thrown stra,*x fye 5d 5sl9kb;vsjight down from the same buildingslfjb5; x ks5e*9 dvy,. 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 position0o.f av7p :.qa5omcvu8u* vyu versus time graph ofoo.uq cv5.f7: *pv m0 uuay8av 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 witkdf qp/-ktt3v7.qw8htle4zl8s,y t 2 h constant non-zero acceleration in the +x axis. The position versus time graph of this,sqty-8t4.t 7tlk wkq h8e2/vdp3z lf 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 vn c fkw65i7f.aelocity in the +x axis. The velocity versus time graph o5n7.iff kca6 wf 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 +x axe ,gey+q3oig-is. The velocity qiegyg+3e, o -versus 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 versaueyg4h8cw vipp32 a f28 a8b :he+:cjus 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 9u8zz7pbaru : 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 grap eveo:wo9v.3n h 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 time graph give* iy:8w9fsda3eb) xo as

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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 ti+3( 3gcnthgmo me graph of an object is a horizontal line, the object mggnh3 3+c ot(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 gap vr pg5n/iag*)z6:v b9-tjqraph of an object is a vertical line, the object isg:aag)p6-qn z vtij rb*v5p9/

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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 object/ w-h*ear,xn7 bl4jq k i,4 hk-ebl /xaw7*r jnqs

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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 straighb1zm7dd+ r//j*zve,cel 8t .rr4bhio t line making an angle of 30 degrees with the time axis, the object + /7dzlv t/j 8e*,1 robecmr.rhz 4ibdis

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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 distance tca/scq ;)ws1 lraveled and the magnitude of the displac 1/ wsc)qla;scement 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 thrdcz8uq93y5yk 7; z water. How long will it take to move 12 km upstream in a river flowincz uz3q9ykdt8 7y5 hr;g 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 = 160i1llk8/e7aoz5exn-x 2m qyf;u0o y( y9 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 km80n/v4suwf54 qa9d xjf (rbmj 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 (approximately 42.02df 4ex/omgf(s,c t l9g.nj q2 km) in 2 hours and 57 min. What is the average speed of the runner i(2sq2ge c gdn / jlx4t.f9fo,mn 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 t r +u5xm0nu*hdzg32,3q tankfo 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 one yezey3g3om mfd 12e0 2cmpf+2ms ar. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly?dgmesm3zm 31 2e2 fp2yo+mf0c (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight road and you look to the sy6 ipvp+p. 39gjbait)ide for 4.0 s, how fa3p9t apj)y6ibi vg .+pr do you travel 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 averad.0s:qjevzx 1 ge velo:qd e 0xz1s.vjcity 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 v5s:w(7vn w+ ev 6ywdawq.0 cbkm south, then 1.0 km east, then 1.0 km north, then 1.0 km west to retur by7dv e+n0a(wvs.qv: c w56wwn 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 travels 1.04b2vr s -9gmb/+1dykzaoxa o-h (ziv4 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. Thisxozvy zb-d9 iakr/2gomas1 4 h4(bv -+ 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 110 miles. Ite:k5(7yh q tbk then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far istk5(7bykh: eq 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 y;pv47),jtuyp ck)oy 160 km at 100 km/h. What is the average u; y7c)pkvy,)p4yo tjspeed 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 and 2.0 hiwk vtu.a - kn42a4y q:h97prg at 100 km/h. What is her aver.-7ah2qyk i uvp4a 9r4wk gtn:age speed for the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h sc(-l5 8 dwwaksm07e;)ses4f v nhrb 6routh for 2.00 h and then at 250 mi/h north for 750 abdw0s4s-(ne)rw sc lmk hf87re5v6;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 run;wcx9x 5u1le f62ddkqs 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 final leg of the race, in order thx19kf2q;d ulewc 6 x5dat 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.7gb kcg h34/e5rjc3jr The car's average velocity during deceleration was 50 rk c/rh43g7ebj c j5g3km/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 thjvaaxejqb0ds(8l yh: 7- r4o(e average rate of (4x78:sl-ay j adbjo ve0r(qh$15 \; m/s^2$. 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 acceleratu6jp7s w,hz +c4up4bl es 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 rxipd75umj:cn - 7yst:est and accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then speeds up with a coe(w9qvi67f5 frjo l;rnstant acceleratio7 rirje( f5qlw69 ;ovfn 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 rof.3,, r54 fyyk1l+vjhdp anvelocity of 5.0 m/s experiences a constant acceleration ofanfd f 43k.jrh pyrv5,+lo ,y1 $2.0 \; m/s^2$. 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) k7u npf/s pc69with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. Wha7n ufk6spp /c9t 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 catapuwpax 9c9j). snlt on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of tx.9j w9c )spnahe 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 acceleration jn 7yy9d 1m; t5m,zkskof $2.0 \; m/s^2$ 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/s2y7 w 1;sqvxncl kv+rp9 aa21 8h,sltt in a distance of 200 m. What is its average acceleratit ssa px;vyw28h1rn+qlla791ct v2k , 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 uniform acceleration. Durinr 2y si85cr yqixr i gc*,ieas;c+9y4tt*;n 5cg the first second it travels 5.0 m. How 2i9*i4c*c cyr etc55q+ ;y i,t siyxa;rsrg8 nfar will it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant acceleration. Initial7.15l vwplu ykly it is traveling at 16 m/s. Three seconds later it is traveling at 10 5vuk wpyll17.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 acb u; lnc)ee -fl-4on(acelerates 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 at abon7duhvc i,lp /jph4hs 2; je2:ut $5.0 \; m/s^2$ 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 hasucawt/(a1- u c been waiting at the intersection starts ahawauu t1c/ -c(ead 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 okx y+4kasnku8 0q*v +kn the surface of planet X where the accele0v+*ya 8kxuqkk 4n+skration 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 ofmh4zf:yduh1cyxif0o7 f l774:e -pzt 12 m/s on the surface of planet X where the acceleration y: y1im7-0 hflfth47z:op4cz7xudfedue 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 speed of 1(nz(7;vh d9ksukb76*z gd l au5 m/s on the surface of planet X where the acceleration67g u* 7(vz(k 9a dbudlhzsn;k 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 wit.r+q- l-s q*rv ffs,whh a speed of 14 m/s on the surface of planet X where the acceleration duer hl-qv,rf+w-s*q. fs 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 gcnmc 4vhubfe.o329p; reater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expe v.umb2 h39p;o ccfn4ect 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 velocit x):zfs hqi..1iz:tmb y of 19.6 m/s. What is its velocity after 3.00zf): .bizh q: tsi.x1m 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 ia4o bl2d4 /sryl qf: jg(m4:vreturns to its starting point in 10 s. What is the initial speed of the buvfr s/mdba:yli(42qg 4jl:o 4llet?

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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 does it ta (2so.l d/skvzre(0 61gutte 8f qlat/+p)b peke to return to its starting poin8uoz 60t.vf(+b/(/ep glse21lktas tq) redp t?

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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 frso(9uo2 ;dltku qc /k5h/kh2tkb8z j:om the top of a building with an initial speed of 25 m/s. It strikes the hkto j9;q2 kkkodzh u5 :2 b/ls/8cu(tground 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 stra1:mi 5( 7 2s)on0 uh6oiaisayep pf-dhight up with a speed of 30 m/s. (only fill in numerical valu0spu i5 sa(ae:fo dm o 2ipy-1hni6h7)e in 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 strai4 q62 bvnhnaq-ght up into the air with a speed of 30.0 m/s. (only fill in numerical value6qqhan2- 4bnv 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,,*q 2oskf1nwzzyrek j-/8ow 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 velocity at t =qnf*)g5ini, x 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 thb r (0(gdpa)s y9jqob.e 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 t =0ckm9 cdb p y-a)f/ka; 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from 0 to 4.08co2jfmih*kauu, s2u 47sr v( 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 isd-p 7crwf j922 x py-b8fleq(nyi+d(s the average 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 achw g+wlpj+ 9u,qo kt3/j:b :d8szgts; celeration 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 iskih:kl2)9h d n the 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 accelel 3iy u+/zf2k9wssh7 tration 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 + 3hr)xaqg,kcqhf*re) mbm7 ,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 displargy/pkvc 6-tg6 a5hi/cement from 0 to 8.0 s?


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