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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: admin   总分: 98分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels from one point in space to anoth jgiuib)-q(sp7r:;i *+kxrsver. Make a comparisoqb -k)i(j vg*urs;ix pis7:r+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 e u2 m7frl2jtlnx)0u8u qual 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 can go "from zero to si -pmo;u6htl3q xty in 8 s". This is am3l;qtop- hu6 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 z 9nko -1cr4h9y6wkp6he/0tb ms:akt +x axis 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 tjd2;7qvz4hxf h9q: ljhe East (+x direction) begins to slow down as it approaches a traffic light.49q7vdljhjq;x:2fz h 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) begins to slow down 4 :llavpu2l)aq0e0ux( ;lpd j as it approaches a traffic light. Make a statement concerning its acceleruxa2p lpj( 0llvd;:40ulea )q ation.

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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.e:ur ,aa4.k nz Make a statement concerning its accelerata.k r4:u z,naeion.

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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 5hwohlr(1 1d/3ra +ubjw cp1bck2bc/mean that the acceleration is zero? Support yourb 1hbw32c /pj coa+1(cuhw/51r drlb k 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 chgwk .5d4mbl6wange direction when its acceleration is constant? Support youwgw54.b lm6dkr 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 acceleration. Make a statem-dqgnk)t4e tn *bw26hp2 t5yxent concerning its motion wixph-tkn2*g wd4tq56t nby) 2eth 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 increa gh f9)667sv*sudb 6mvg+c f0mgj8x wasing speed while its acceleration is decreasing? Support your answer with an examplem+g9 6u)w6g6smv bghf v *x 87jscadf0.

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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 of ice.kwai6.1 ftv- g Make a statement concerning its accet igvk6.a-f1wleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what conditionsv/8 :) ogmlbx is average velocity equal to the average of the object's init ml gb:8sox)/vial and final 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 accelerate atnk01s:dycq8 f the same rate. However, object A accelerates for twice the time as object B. What is the 08s cf:d nkq1yfinal 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. They both accelerate at the same :l9y)no8bderfq5s oqel4da6 + ;* zrlrate. However, object A accelerates for twice the time as object B. What is the distance traveled by o6s +*)qdzo5rr d8y qfoeb la:e9;l4 lnbject 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 k1v20tjt7vpn in the absence of friction, which of the following is true concernin02vt k71n tpvjg 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 fricti zfnhyqbq9 g9av)*: vif7nv6:on, which of the ffh v vq7i*nfya g:v)qb:zn 699ollowing 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 aboe 1hsolxzgo 08vv/ (b3ut the velocity and the accevz1 o3 h0olve8b/(xsgleration 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 ju-.sym /3 r1zszdp1vw20wsq 8fd kf 8gdst before it reaches its highest poinkd /q 8 .1 zds-83gsds2fwy1w 0rpfmzvt?

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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 ma 6;xgx;pob sn(* b.fpw7 t,t4rrio u+iximum height, then falls to its initial height. Make a statement about the diretsxniu ;rp,bo+6xg iwr*tp o(.7b4 f ;ction 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/g7ii9a: 4nergfad7o6o 7q ss to its initial height. Make a statem/g7 rano4i7 ao7gfe9q isds6: ent 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. krzm(f0 zw dv2kd2fycnor*i mu; ,iqx45+9r ) Make a statement concevm 92i;,zd r)kif(05rczo+y2wd runq*mxf k 4rning 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 a6r /j7k/xy tut high-flying plane. What is her acceleration when s/7 kjt uyr/tx6he 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 vertica y4fp 9fuy ,nfx5;d-ohlly upward with 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 x 4ndp9yy-5o fh; ,ffuthat 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 a building. One second later, ball B is droprj.7 vd(gh5n gped from the same building. As tim(75.vd nhrjg ge progresses, the distance between them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top or o )r:okn7be-zzrw-sw2xbf3 ,d/b q. f a building. One second later, ball B is dropped from the same buildiorozb:,w.-e f/w qdb rs 7z3x -bkr)2nng. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from thy/w0y((me:w,ohs +/l rwwtj oe top of a tall building. One is thrown up, and the other is thrown emlo/ s0yr(w wth:w,(+/ ojywdown, both with the same initial speed. What are their speeds when they hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from the top of a building. A second brick is thrown stra mizx1icc, +r ,j45npaight down from the same building. They are released at the same time. Neglect air re mr,1n,xac5pzi+ij4c sistance. 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.*1ufy0-fsyr qb n2nris. The position ver r2sby rnq*.uyn01 ff-sus time 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 non-zero acceleration in the +x axis. The po6 6 0gbcon7x p9ar4glfsition versus time graph of this o74 ga o9px6nrg 60lfbcbject 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 t/ cmfvm 065ffyhe +x axis. The velocity versus time graph of this object if mffy0vm/65cs

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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-zeroxq.ajq /zapr,83uc- j acceleration in the +x axis. The velocity versus time graph ofczx r3q qj p/8,-aua.j 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 f2 hudi*q/+a uv:vt:rgives

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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 versusy ms5h*x5jvubeqptu d8 53/l8 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 curvp*f/o( c3geg xe in an acceleration 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 i1 /+epo7rx tbwn 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 line7tno j.plsn cug(u9-(+)a jes, the object is s(u+9ego .)(ln- jst7pu janc

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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 objectk k0xyl( i)xu; is a vertical line, the object isk 0;lxi(uy k)x

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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 e5i8d)*:cn qgxxk:w y lt09pcof an object is a horizontal line, the object is d8q9x i)e:pwyc*:cg0 ltxnk5

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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 lina r zvs)q 11q j;l .o0sp+hy6*nmpw/fke making an angle of 30 degrees with the time .hzyfvsq1;n/*k1oqp arw+06)mlj s paxis, 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 thn y., xuu14ufaf2tfk gzq8(+u e distance traveled and ttux.uzg82+nku, 1f 4 fqfa(uyhe 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 lzgu iwgo:vep2f5+d)+nl og9(:i hvh1ong will it take to move 12 km f di 5ow9h nov::(hp+elig2zg+) vg1uupstream 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? (1y;9 rl1 h0q*vlydg v) (3*nqtr,gy kka 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 avec5 yx3cmxbe6rss+ +z2rage speed 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 marathon (av:cb dju t6v1-rid8v4pproximately 42.0 km) in 2 hours and 57 min. What is the average speed rt: 1d6v 4-bidv8u cjvof 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 itf fx9et ):lxyu:r*0 long does it take 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 that light travels in onc3j2 j apm71ofgz12 obe year. The speed of light is 3.0 17b2f32oa gopjm1jz c0 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a sto afrs 0*wkbsk, *g83lg. a/daraight road and you look to the side for 4.0 s, how far do you travel during this inattentive *k akgg dslow/03sa 8fba *,.rperiod?

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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 trac8c;s m5(2pka (cyo8zn* jb+rxmfvl0ck (400 m), in 100 s, your average velocity zap5m ( bjco;vx nfr *82c8 scym0l+k(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 sou/r-j(,b.lo6r )rsd n cbmu5epth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its s-b ujor(pr el,snm db/c6)r .5tarting 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. u l7 7h-wly/d f5ojsc 3*1cgzvIt 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. -3c y7u 1osl*lw5hj7/fd zgcvWhat 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 mii6;a y q04gnnples. 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 pin0;yq agn4 6hometown 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 k1y0y(pmtwb 5n m at 80 km/h and 160 km at 100 km/h. What is the average speewbtp0y( m5y1n d 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 h at 100 km/h. What is 2s 9zpv9vg er36p1j ine4nv.gher average spee6gi p evzgn14rs.n9ev9v3j2p d 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 a7fo/ 0m07v ,yzozbz*y1 tnqrmt 300 mi/h south for 2.00 h and then at 250 mi/h north for 750bony z0z qvm70oy1*/frt ,m7z 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 whojh9) zz.4 kjh 1r9clbz 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 le)9jj4b .r9lzzh cz1khad the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates unif0 kxo0 d:ug7qtormly and comes to a stop after 10 s. The car's average velocixd0 :qgt u07okty during deceleration was 50 km/h. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to 160 plt60ur)v) hg m/s, at the average rate of )g)p6uh lv t0r$15 \; m/s^2$. 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 ai:h;fi3xd ;vqe5 1tmfbsx+ (kccelerates 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 accel du ddlyk ej(588,ebn9erates 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. Itw3 cy;mxlu/u; 2w zwu31uup+e then speeds up with a constant acceleration of w/3cuzw ulu2 +3ume1 xw;y;u p$2.0 \; m/s^2$ 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 initia adrmll7u)-3q;ys kesc rt )1/l velocity of 5.0 m/s experiences a constant acceleration of qd)ss )c-r 3lmeu7r/;ltk1 ya$2.0 \; m/s^2$. 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 horizontallw+ okdyb .0ajbkfy a.5:4mtr:y to the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is t. w o +tarya4k:5dk 0.fmybbj:he 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 q w+t 7:m-bjwwan aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, aw-t :bqmwj w7+nd this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from rest moves with cov58/ g x)wts7 ck:yxirnstant 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 mb(. wv umvnsfe4 s6+t9. What is its average acceleration? un(tm .46 vf9wbvs+se

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes uniform acceleration. During the firste0d zww (e f-v4ame8j g*2mrp- i8j3yap9cwg + second it travels 5.0 m. How far will it travel during the third sec*d2(e+w9e8i-gvrc4a m8pm w3p- yfjeg0wzajond?

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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 constanili xj g*vd609t acceleration. Initially it is traveling at 16 m/s. Three seconds later it id*vgi9l0i x 6js 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 uni3) g5x1g o2a zj:bmiyvz5gwaez(kb0i ,+h 1faformly 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 roaden)wk+ea /e-ym(9tyao + 6 xuh 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 turns green, a 9 yczwvkbexp-(l cri5y; *-mqnq 8h93car that has been waiting at the intersectio-(lw 5p ;ihzcvq9rqye-nx8k9m *3by cn 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 upwv ;j*b2*zd7dnu acf e4ard with a speed of 12 m/s on the surface of planet X where the accelerat4dcvfjn eb;u7z2ad ** ion 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 spee) qqlgjt 2bg65*is mv.d of 12 m/s on the surface of planet X where the acceleration due to gravitygi5 *.26qb jgl)sqvm t 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 zdzc bbl--rc6 r9 d;4jthe surface of planet X where6r4lccbz - b;-9rddjz the acceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 14 m/s on the s. g qg*cmpcto,ygam r,dx9 +((urface of planet X where thtq*g+y,r(axm,p 9gmccg d.o( e 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. ;h4alc3b+cq p10 s. 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 cat;cbaqp 3h+cl 4ch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity of 19.6 m/s. What is its vsy( ,)ll , 7azhqs.ikjelocity after 3.0j, 7szaq(il)sy, kh.l0 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 starting po*iof0 l3,g*j:(k,qw,y:xpi wpk zb xqint in 10 s. What is the initial speekl(:k iwiqb*:p jg, *y,3zx0pf xq,wod 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 does h8tv;b 0p9 t5j pa0agyit take to return to its starting poiv5ta9bp; yh at00g 8pjnt?

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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*qxg3 9he6xt5n z4d9s11xcyy k ft/kz a building with an initial speed of 25 m/s. It strike1xdf z34qkk * 99tyxcyg6 st/5nz1ehxs 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*gl q5:mo68ynf*gm lt. (only fill in numerical valueol5 mq8g*f:6lgym* tn 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 straight up into the air with a speed oe5 r fx2h,1wl1-e3jau, orapq f 30.0 m/s. (only fill il e, 5rr1xoe,w2hu aqf-13jpan numerical 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 s +s6xoclc-w o5v3r +vk?


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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 = 2(sxa yvq/8hi6 .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 = 4n;jgz:-qxaa+f6 2fbgk ud )l/.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 = 5.5 2tntuq blh /tb) h6 ;dvn*51-0yzqjyes?


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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 frxrvt: 62w:+*a1 rxddhg pnr,wom 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 2dkl nm )hfp/-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 acceleration at 1po+.gx cys3 9t.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 accelerationhw9ae50n4v)t.j mp sn 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 fr (.7qzsd4;ydc s,3ynww - wciwom 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 z.yi)doeq /lec fc- (, n)-w2 p-qbivifrom 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 wwn(3f(b a3gh from 0 to 8.0 s?


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