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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 poiz: 2gsh20qv kao6hv70 ko xub8(.y mppnt in space to another. Make a comparison betweehp.u hzakp20:8o2k6vgq 0 7mbvos(yx n 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 .pv nm-6o33vew56zeg)rez dl an 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 can go "from zero to sih 5p4-xdvn/ alp9) 6 +twqpr.mlkf ya;xty in 8 s". /hp xf-mptr kd)w a5 9pv;ql6y4 la+.nThis 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 axisld ;4vrxvax:6i nqc;5 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 g4 p *5ao;b6z) 5i8dk vxkwohtto slow down as it approaches5ok5pvxikd*6)4az8g;hw bo t a traffic light. 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 2y 8h h6 q+zmv.tuy 4iaqi.i9hto slow down as it approaches a traffic light. Make a statement cqh9t 4 8y m+ah.i2qyuivh 6.izoncerning 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. Ma hkgl93v-r;(5 zjuqieke a statement concerning its acceleratioj5vu3 egh-z(li k ;9rqn.

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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, doer: y4:mbxwgwt 6z/id 9w3qxf8ci3vkxe1d 0r)s it mean that the acceleration is zero? Support your answer w:v6t84iw d: fdygekw0 z/rir c)bmw3qxx93x 1 ith 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 velocity9 u( te8jxh)mi,kaqz a:j4 sv+ change direction when its acceleration is constant? Support your answer +4vuj a9 (mk8ehi x:q,sj )aztwith 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 u962gaoc bxq, p.r/m ois moving with constant acceleration. Make a statement concerning its mo.x2pbm ,q9goucar/ 6otion with respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its acceleration is decreasing? Sua5w mkqkq+m;, pport your answer with an5w k;aqm+q km, 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 tx:ud )i ga7z6hill of ice. Make a statement concerning its ac6iu:g xd)azt7 celeration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to the average of the objecnf 0s4qp- /i, :)zxpg7iekb rit's initial and final velocit)kx-n b e,ri/qipfzgis74:p0y?

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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 resqna1*j8gf5c38ea jpy zg2j-mt. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Wq18e8gjm gjy j-*p5c 2fz3 naahat 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 restuh,kvy3qv hultd-9ts0.6q- w6y k 6sp. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance trav tyvkkuldw0pqvt s-36u h.- qh,sy669eled 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 andq- lgqp- 4txpk,52fpk falls in the absence of friction, which of the following is true concerning its mk4gpkp2, -l qq-xptf5otion?

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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+oyk,kys;zd.b:x p5 b of friction, which of the following is true ck5:sb; ,dkzby+o.ypxoncerning 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 about the velocity and yk9n* kbgn,b1oqjb-4 tbo kkg 1-qny9bb,*jn4he 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 straigt: 6-v:uux0hnslyc. kht up. What is its acceleration just before it reaches its highest point?nuth 6y.vcx- k:u0s l:

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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 to it ph3x7o0l7hqh( l dm;os initial height. Make77o;p(03omxhdhlq lh 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 maxim5xb6 y-cywn( gum height, then falls to its initial height. Make a statement abo-nw6 x yb(y5gcut 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. Make a st5jn( z+ir0cu wwu6u1( zyg7m hatement concerning it0um+j5y(u 7wuhn g16wc( iz rzs 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 her accelhl3vda;cm*vw 59*n/ we8c kn meration when s kvh9 mwd* 3/eccnmwv8n ;a5*lhe 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 win4ga o1 h5cs:nth 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 many times higher does the second ball go than the first ball?so:n1ngh4 5c a)

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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 fromhzkbzuo.9mmn 4.07 qt the top of a building. One second later, ball B is droppedztmun40b9 qmh.7.okz from the same building. As time 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 topzz/a 7 dp g:2*3hf88:h mgt.tibc zbmb of a building. One second later, ball B is dropped from the same building. As time prozm :cgb3*fibamphth b/. 788dzt2 g:zgresses, 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 the top of a tall bjjk)esrq5pogwo: (pz/z8 t( 5uilding. One is thrown up, and the other is thrown down, both with tj/ o5)k8(r:wpqzg(o jpez 5t she 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 secbs)jrhlbx2- k np wxjnl++u/8i4qq /9ond brick is thrown straight )rsbq // 28xn p+ nw-+94jixlqjhb ulkdown from 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,0+.pk0o iyjeqk g8ym-zero velocity in the +x axis. The position versus tiy0 egk0 +y .8mpkoij,qme 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 a,lfwrq .akbm2ge2bms ; *oc3 wvc7z)4xis. The positio fkml4v.gms 72wbw*ce ,;zaor)2b3 cqn 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 x+w ryw( 6ni4econstant non-zero velocity in the +x axis. The velocity versus time grap4x+ ry i6w(newh 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 a61kuuwhd-z f /cceleration in the +x axis. The velo1 h/du-fk 6uzwcity 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 versus time grag x :fwnt:5d(* x +gv38yaxt:kmyxl5dph 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 )-k m;m, 5i u.meahrcctime 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 *.a3 xkz5rt zuan 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 in a velocity versus time graph givesjq/94(nifj kb

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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 fn+p c vka/+jl.xpjlut- 80 g3graph of an object is a horizontal line, the object iskf c tl8p-+pxa03jnj./lu +vg

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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 ii ss:zxyvtv+ -z( y6x8s a vertical line, the object is+ xxyyssi (8tv z6vz-:

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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 ohs1sy3n/n *4qs:2wy x zg 6ba;kz e4hsbject iszys1;ghqznwhx/e 4 ssyk*4: 62b3nsa

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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 line mak gpx 4jc:kyl6y4f)c m2ing an angle of 30 degreeskglcp6 4 f4):2y cmyxj 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 nortunxkbngk: 564er. yk-h and then 11.0 m south. Find both the distance traveled and -. yxuek :4k bgknr6n5the 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 will it take to move 12 kmf*fkw4 ixe78rloveke c +bgo3 q3 2h*) upstreaihf3 4 +wl87xckovg3* r*oee kebf )2qm 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 =c7s((hb1 1tck0sjrl35ak u xg 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 n/10g4wq+rof t-kduw 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 42.0 km) in 2 hours and 57 min. What , 3cfdblk+x+ wcmt/e,bmqz 59 g pn.:vis the average speed9tp53+nz: + e ,./cxv,wfmbgd mlcbqk of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long does it take for it to travel 40 i54*2ttllapnyw)p9d.qbsk 2 0 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 distancbm1pwfb-5 bvh s (sn21vw5*qz e that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 s55f1vb-hw1wbz 2 s nbv(mpq* 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 srnxmz6t:* hiscn f( 370:lnp: gukeg2traight road and you look to the side for 4.0 s, how far do you travel during this inattenczl26u:i:3m0* ekptn : (ngg7hs nfxr tive 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 av8 w 6 bi7ri)qdtw7cmvc)-b;faerage veloacv)w 7ibb68rc;f)-m q7 tidwcity 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. Ifadiahg p8)q yrrhj3a ;yyw3v.6cl1b 7q; -2lt travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to 1q3;jy d;wahgy6f)2 l-8airh3a.y7qpl c brvreturn 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 th b71)56x4avbiq lgbyre North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear7axlgiqr5bb)y 41bv 6'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 scho3e jhhe,q,rn8ilr.q; ol at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hou8;,hqrneqj r3hle .i,rs and 15 minutes. How far is 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 03obz ajtp j0:t wzt4*km at 100 km/h. What is the average speed of to:paz0*jt3zw0j tb 4 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 wq: o7;w ey0y)t u-bpq ism)p/at 80 km/h and 2.0 h at 100 km/h. What is her average speei)ts qp b70mq-:w) yew;ypo/ ud 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 300gijs1ul5dsiq +:s;:l:ziv ) i mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed i:lid;:gql1iiv s):j+z5s usfor 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 whn 4dx4lmw/2ymo runs the last 100 m) for team A can run x/4m m4ynlwd2100 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 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 0a+rcx9tw 8x86xu h lkafter 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's968ht8u+lrxc x xa0wk deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to 160 m/s, at the average ra gtdhw p,j17r8te of p7dh,w8gjt 1r$15 \; m/s^2$. 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 accelh d6mq,giu2wdl60vzk nn vf ,:+e +69 j3jspdherates 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 acsl)6oohu0 grcq ,l 1cdl*b /t)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 with a constant accel fug3g 7v:;oo 00ziqdaeration :gzv3ogdoi ;aq07 fu0of $2.0 \; m/s^2$ 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 e3d3rvnt,bsm y3 g/e-/omcc . zxperiences a constant acceleration of dvn ytz /s-c3/e,m 3m.ogr3 cb$2.0 \; m/s^2$. 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 5mt;kio, m xy2 lwys3s;jxj )-,00 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average acceleratiom mwyjx; sx2k)ioyts ;,-,lj 3n, 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 f l 33vwj0c8kuqrom a catapult 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 theq 8 lju03c3vwk 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 ressrnw;a7vk:jt3 9 f .sgt moves with 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 its average fjhub;d. roh/ r3(v0 wacceleratiu( .b dvoh/r;jh0f3 wron?

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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 acceler,ss0 qbfnrj 15;9 y l8q)bjpy jpwyqmu:(;do;ation. During the first second it trave,q9unsbpf m)db;:j prywq ys;j; y158(jolq0ls 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 cq7 u:vt)5xx4gm qokk /onstant acceleration. Initially it is travelivg 4qtoq)k/m k75x: uxng at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and a xmrk 1j9 ggwm7:()yexccelerates 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 roagp4ka, bw7 pb.d 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 ga1zbgya4; n 3qreen, a car that has been waiting at the intersection starts ahead with a constant acceleration of abq;1ynz3 ga4$2.00 \; m/s^2$. 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 planet X w2qvpr.7 f ra.ghere the acceleration dp7fr. ra2.qv gue 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 oo-;29u5ik 6oed exmzbf 12 m/s on the surface of planet X where the accelerat2bx- oeu z;dke9o6m i5ion due 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 15 m/s on the surface of planet X wqug/: :pp)m myhere )ym/:pgm q:upthe 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 surq2qi)i9(j o gaface of planet X where the acceleration due to gravity is (o9g2a)ijqi q$3.5 \; m/s^2$. 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 yes/k6.tvqi 38gs3e fi(wug *v ;b1im 0.10 s. If your friend holds a ruler between your fi6;q(gi33f e g/ks1iey* iv. bv8wustmngers and releases it without warning, how far can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward ahaq;aqdn-w:*hv ik .9-ef3r at a velocity of 19.6 m/s. What is its velocity after 3.00r ef9ikn.:*avqh h;qda-wa-3 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 point in 10 s. What ixsqpa 7f0d 2vi z411jgs the inivxj17gf0za4 psd q2i1tial speed 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 upqag3u;dg z76v -ywbp-is 7 0ua with a speed of 36.0 m/s. How long does it take to returnyzwqp 73iub6ug ga;-ads70- v to its starting 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 with an initial speedooqh.si)v0 osu1e 3t:z.b 7ry of 25 m/s. It strikes b0hzy) o ..oi q3sv 7o:1rsuetthe 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-tyos r oj)v:f d6exn*do0j(. with a speed of 30 m/s. (only fill in numerical value s.)ddoyrtv jo(6 :-xjof0 n *ein 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 wito8e .v.1adwmq h a speed of 30.0 m/s. (only fill in numerical value in the blane .wvmdoa1.8 qk)
(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 ve j7i6 .mqp shi,hh3)wblocity 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 = 2wuv l). vz6 qyp)kp6w8.5 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 tq5f)ajv 6ef9. aex)i 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 = 5.5 sd (jcu6fs .ue9ro xp 64gfm62z?


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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 v3x+y/gwtq1fq k7 lvt 1:u1ckto 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 velocity from 0 -v fpbek83wcl 2q s9a7to 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 at3g sx5: 2zj1cyea(xyn 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.d*d*+ion2r4ao yxf8 pdi3ia2 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 accelea;(l c l6b4tcpration 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 averagk-6z5*q 0sn fmjqw5rv*hli : fe 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 f7y:jl xpf ,l k+cd dke77c;x gkp;n(6yrom 0 to 8.0 s?


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