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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 point in space to an:e)-s xifq9ff)f(p 0eu dcc) awv8j.xother. Make a comparisox) a).sj:fw fvec0 exp(- fdc98qf iu)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 velocitykg 45mgr b aenh,( 7stq ;3soh(;hzjo/ of 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 advertinqms+34sy q+j ses that their car can go "from zero to sixty in 8 s". This is yq3jnm4+ qs+sa 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 experiy2967 g-rajspuy jr3sences 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 Eas sgztkd6v.-8 j1fkay7r1uu 6 kt (+x direction) begins to slow down as it apprjkt.zrd 6u7g11k- vf86ysk auoaches 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 to slow down asle9s(* 8,b :kdcqyqc j it approaches a traffic light. Make a state :b(*j l98c kdqy,csqement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a constant veloqj ym:. kf7 . bdci4mh6kqpx;jo691jocity. Make a statement concerning ibm1hock.j67q yxoj6p;iqk4.f j :m9d ts acceleration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, does it mean that the accelek 4yrdlp.; d-zration is zero? Suppo-y.p dr 4l;dzkrt 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 direction we z9ikeq,(:p 8. kolsvhen its acceleration is constant? Support your answer with an examplk.e oespi,v( k q:zl98e.

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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 accelerationq4 pad +:rz1(t9(ta6czftva( qba;r m . Make a statement concerning its motipq aaq( drz4a1cztt((:f v+rbatm; 69on 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+y4yebuk:,fsf 4 0mn u acceleration is decreasing? Support your answer u4 fu0e:+ ,4nymsb ykfwith 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 init; 8 3mwt mgrjbgf4/h*t8 qhhu7ial kick, moves up along a smooth hill of ice. Make a statet/h8b mfjm q7wu;g3h 8rg*t4 hment 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 condition is average velocity equal to the average of the objeco4oh-)2bfg* v lor/kgt's initiabk og-roghv4f l/) o*2l 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 at the same rat r 9neq ccj,l-q7+o1xte. However, objectrl+ 19-qoj7xc,qe nct A accelerates 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. They botu,wtf4y r. /cjr.y2 cyh accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled byy, /.4uw2cr.jyr tyfc 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 i6vk5p;w0o*nyd7e cuz n the absence of friction, which of the following is truucov dyk;w 7p60 nez*5e concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence of di;slhovh o .h eu-/8*friction, which of the following is true concerning its mothsu*eh;v /.oo-d hi 8lion?

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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 v 7lifx;bmf t3wk4pv5 xo4d1*m elocity and the acceledm3o ;xbpm17 i5f* fwtl4 kvx4ration 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. Wh+x2b +qtx,tcwat is its acceleration just before it reaches its higx,w +c+xbttq2hest point?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up, reaches a maximum heig4z1drtdeln. y gv9f6)ht, then falls to its initial height. Make a statement about the direction of the ved 9vf1r6lzg4 )tynd. elocity and acceleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maximum height, then falls to its initiat0pxgexy/ y6g .lt77sl height. Make a statem .esxy/6 xgt yl7t0pg7ent 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 of48 i+ r0z +mcob(pdood(yrt.t air resistance. Make a statement concerning its acceleratioz p8 t+ooi. 4rtc+( (0dbmdyron.

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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 bcvvyhn cdc1 6x;8 f6*0k fl/la high-flying plane. What is her acceleration when she s x8c yl6vdb fc0vn6klh f;1c/*he 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 verticallyf--ww 5-qzk2f8v5p fzy; mejz 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 that of the first ball? (How many times higher does the zyve5;zz -f2pw8f--fwj5 mqk 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, balbb u4qj9eryk/v3b 0j 2l B is dropped from er3qy 04v k2jbjubb9/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 top of a b qms;iii)3r:v uilding. One second later, ball B is dropped from the same building. As time progresses,v:q r;m)is3ii 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;6y +nf 1j5l8pauwvxz tfi2)y from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are8y)van6pwt x 2jizfl5 u1; yf+ 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 ofv 8i s:og i; jc2b-f3l7pzzk/n a building. A second brick is thrown straight down from the 27p z:bc k fojngi z/lv83i-s;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 constad1y4 kabw6+t fnt non-zero velocity in the +x axis. The position versus ta1 t6yfwkb4 d+ime 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 thejel2gfhh ls:3pcxj ( 53 mh1-u +x axis. The position versus time graph of this hxc :3hlshj3gu1l-mep(f52jobject 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 the +zbnc 5l6-4d7f, pgbr 3p)p jj rmh)jm,x axis. The velocity versus time -mdgzhbj6)rlrpjf, 5p4)c3m,bnj 7 p 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 nwphm0y n, 3p+vph +fg5on-zero acceleration in the +x axis. The veloy 5 +g0pp hnph3,mwvf+city 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 graph;pt0d-iv mcn / gives

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity versus time graph givu 05ioxwxab* / /+rtrdes

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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 gr, fml1 /lton: lwv9yku c; wuy,;t.*msaph 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 v ny7kko)gf76 helocity 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 hori4l(smo5 l* f5hm bai2tzontal line, the object is5lh4 m *ia2ms5tf (lob

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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 lizvfig,+w1k4jy6t.pd7 nk ;hq/k u c(ine, the object is/fkq 47+ k uj.pivhg,ynz;(1k6 cwdit

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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 y6zx0zyqefo u/fejt7, t 09e2 is2/qzyxeee z0 ,9joyffu7 0 tt6

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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 (0,jj;tux gsuis:)5hyiv ,nbstraight line making an angle of 30 degreesgi(subi0h ux,sj ,)nvt:j; y5 with the time axis, the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and thenjsb a9j 8cm(3z3 v:wbjm0 xp:qi zno*7 11.0 m south. Find both the distance traveled and the ma7 x(bq:bp :sw8n 3ojz93i* 0za jmmvjcgnitude 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 w6y/lg fujc+ea-k-v5f ater. How long will it take to move 12 km ue l-6ajcyf v/fg -uk+5pstream 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 muxo.z43 b )w6mr1k yuf/s? (1 mi = 1609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your average speed in order to truzd-7r vr55gzavel 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 (approximately 42.0 km) in 2 hours and 57 min.;0za plf++xzr What is the average speed of the runnerp0+a +;rzl xzf 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. x tr0 p+-yt7jz6y:qfxel , kn) How 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 8d oqfj /(lh,gthat light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a lyq8hj( d/ ol,gf? (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 lo7upb/e its c8ogls8 1,go xm7tl0 6t8mok to the side for 4.0 s, how far do you travel during this inat 8/,gtsxslbgm 87lipt6t8meo 1 0c7ou tentive 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 trae sz.(sin i98dco ,1tzck (400 m), in 100 s, your average en1t i8 s9zid c(,soz.velocity 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 kmuqv9:db8 9 zfa3rv)qvmqx d .:-hz6 cxrk40nm south, then 1.0 km east, then 1.0 km north, then n 60z):9q hu:rad. kv8vrzcm9qm3xxf v db4q- 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 travels 1.0 km south, then 1.0 3sc nm6b sdi+0km east, then 1.0 km nis0+s cd3mb6 north, then 1.0 km west to return to its starting point. This 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 schoo:l-y7 nvw0kic9q zs:q l 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 hours and 15 minutes. How faywq7ic s-qz::l v kn90r 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 km at 10x .ul1v9k sf91i0) g8 yymahse0 km/h. What is the average speed .8lvgu 1 yxa 1m yshef)s99ik0of 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. :uwny qh:x)a 4k /k.1bkw +ayp What is her average speed foh / x+ pyauw) k:yakw4k1:q.nbr 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 2.00 h and then ak ( *ft13lq.+ zhjt3 tdwsvf0mc.m1 ekt 250 mi/h north for 750 miles. What is t03k.t(ej m1 *v3+thzsf1 kcmlqfdw. 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 runs the last 100 m) dofh +n.e x)k8for team A can run 100 m in 9.8 s. His ri+) oxnfked8 h.val, 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 stopt:hzjn b dv8vx(k/ ;kgw*cc3( after 10 s. The car's average velocity during deceleratio*h;d/:z kwc(vbgn3kt (8jvx cn 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 160kglcxo5: / )j1u*yl g*yfn wo( m/s, at the average rate of )u lx:* cgfn*l (/wy5joyk1go$15 \; m/s^2$. 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 accelerateswgac 1 hv+:g2y3ss v7v 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 restlkp8s lb;6o b8jov(/e 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 vf ) 17b3vvmmu10 s. It then speeds up with a constant acceleratiom vu7v)vfb 31mn 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 velocity of 5.0 m/s experiences a constant accelyke j,uqrb7l6 8+)icn eration ol cnj87ibk6r )q+euy,f $2.0 \; m/s^2$. 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 (+p2l .fks79/g cfz xy.p*v4 hwex direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the h49 ygsx/*kp..f2fevz w p7lc 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 catapul ahcac(w, ;8sq* nu3: ,keixjonx*f- nt 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 acceleratix,n - a*qh:*(3jfnsicea ox 8c,n uk;won 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 acce/odvu* kl:zs+ leration 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 distan 1s61/irt)lxj5z ycgace of 200 m. What is its average acceleratiosa xzyr)jl c/1t6 g15in?

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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. Du28z o6(pcyq3k(urv ocring the first second it travels 5.0 m. How far will it travel during the th(z c32krqop6yv o8u (cird 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 straightb95:fj3 5nts cb0kx gr /qt)sp line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during th ctr3)0stb59xqjg nb 5s/pf:kis 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 accelerate+mxs7nu.eu:9o* av x+ /prxdes 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 c0;tjg b3oeo3xh 8cmu1an 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 9i n*.evzq4iwzzhf)l9 8xy k* light turns green, a car that has been waiting at the intersection starts ahead with a constant accelera h*9 zn. )8wqzefvi9k4i x*lyztion 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 - j5ni44mv5y cgpzr8kh*ril )m/s on the surface of planet X where the acceleration due to gravin5r*viyj-kz484l5)r mpghi cty 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-q*4 eknr y es5bysb25ubn j53 of 12 m/s on the surface of planet X where the acceleration du553qnr-2 nb*k e5ej y4ssubbye 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 surfa.aeadtu56 cx)ce of planet X where t ct ae5).dau6xhe 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 surface of planet 1h i((vj8) azpvzq )lmX where the acceleration hvzm( )i18 vlaj() pqzdue 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 thay vsv)k)si7kyc m8j;*n 0.10 s. If your friend holds a ruler between your fingers and releases it wi vi7k);*ym)syvck8 jsthout 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 at a ve7/woh n/k( cjolocity of 19.6 m/s. What is its velocity after 3.00 jc ho/kow/(7n 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 is thmj 1z g.zb0vx,t7c od3e init 3jo0vm,z71tzc.gdxb ial 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 up with a speedvjzhq:p kn xxp89i*1 :g.fpn0 of 36.0 m/s. How long does it take to return to its starting poz* px9xqnvp:gn8kf1.p ijh:0 int?

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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 ofkk4i 7yspvy 81 a building with an initial speed of 25 m/s. It strikevis yk47p 8yk1s 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 with2hyki s0 k4b)c a speed of 30 m/s. (only fill in numerical value in the0)cs2by4i khk 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 ins:v-onhw5py jbqy 2d.2j7ww4to the air with a speed of 30.0 m/s. (only fill in numerical valuw2 n.v4q75bj yoh2w-ypswj: de 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 ud0zw hi6; 6nf v;;xba= 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 thefgrh de8+ 76* lrzuyq0id:3nc 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 = 4.0 sg 34v /6i3su1wf8lzlm0ne o:ltt;i8twku 0pb?


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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 velocitv1 ; 0iukupfu5y 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 to 4e b :*qk m10x59hdreuj.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 to 6.0 s?/ l5m 7orah,xdl(g ef-


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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 acceleratioo0pvztml oechgv.h18 8;5 q c*waj9.hn 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 accfl( *l 2*wsxyvzg0z.jeleration at 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 t; qo3f,-t)nbin 2ro xto 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 thesz 4)i,.qrahlc 2;ak v average acceleration from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the displacement from 0 to +i x k-ov7( 8xxp 1 +hi7 vp0tkr.kligrp2s7hx8.0 s?


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