Suppose that an object travels from one point in space to anothe+x) ht vg7s8vqr. Make a comparison be 7)vg8xsh+ vtqtween the displacement and the distance traveled.

  When is the average velocity of an object equal to thsnx3 7u j lzivh2wgc5p3g *b3*e instantaneous velocity?

  A new car manufacturer advertises that their c0w 1 i0xmxela3p 2)o/saowuw-ar can go "from zero to sixty in 8w/xw0u-iasm0 e1 2a)l 3w opox s". This is a description of

  An object moving in the +x axis experienc nr 0.j 7vciff-2uss7tes an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the(x4)r7pp fuvffco b 68 East (+x direction) begins to slow down as it appr(bfr pf x46p8c)u7vfooaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow- ( vd2jr9.g ih (vl zqxjkt(a57n3.+m plmruh down as it approaches h( mil(u5agn(jqd3 rv.vrm9.xh t p+ zlk 7-j2a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocm: 4 8mdiktsv:ity. Make a statement concerning its acc t:is:mdkv4 8meleration.

  If the velocity of an object imz1ab9+ +6oc zd2j izl+fi v4xs zero, does it mean that the acceleration is zero? 49+vlzx o z++ mj 26ciifz1adb Support your answer with an example.

  Can an object's velocity change direction when its acceleration is con0r/qjo;iwg4dk lty-7 stant? Support your answi lk47rd q0;/og wty-jer with an example.

  Suppose that an object is moving with constant acceleration. Make a s.j q nly/ :cb*qhhj5+ttatement conc5*yt+ c q:hq.n h/jlbjerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is dg6pye ):8(s6yihajc xecreasing? Support your answer with an exx(68ci pyhja g6se:y) ample.

  Suppose a can, after an initial kick, moves up alonb po*cu eg,5b*g a smooth hill of ice. Make a st*oe ,g5bucp b*atement concerning its acceleration.

  Under what condition is averagj-qkut3 hq;e*3jtx;vs3z5 wae velocity equal to the average of the object's initi 3 3;jz*h qwksutq;5va -ejxt3al and final velocity?

  Objects A and B both start at rest. They both accelea1s7dr5c7x5p ro iq4dd5ndcx 7eowgo n* ..x3rate at the same rate. However, object A accelerates for twice the time as o .cddaoexrn5 77 dd7 qxg xs5*i4wor1.ocpn35bject B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. t,g8,h+ c8 k,ocjyrri However, object A accelerates for j+ c,8cy, ikr h8ogt,rtwice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released 0 *9lc0q roknxfrom rest and falls in the absence of friction, which of the following is true concerning its 9n kc rlqx*o00motion?

  When an object is released from rest and fall vjtb7xr9s zuz3 n(5.gs in the absence of friction, which of the following is truev n9. xjut3r7b(5sz zg concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the vy0 j:8 j xwmkl)j1xwq l (e,h)ug5ved;elocity and the acceleration when the ball reaches the highe 5ey vd: lqjg1k ,)xhjw )8jxeu(;l0mwst point.

  Suppose a ball is thrown straight up. What is its accel;y.1w-js:jri1u4ppy o-e c8 e.t -h habsqs5k eration just before it reaches its.s1rp;-b.he hj qe5k ipy-aswt: osuc 4y1 -8j highest point?

  Suppose a ball is thrown straight up, reaches a maximum heigh(nc * fsb bvat3n68-v6f2pmhst, then falls to its initial height. Make a statement about the direction of the velanbh(n-vtp6s63mv2 8 scf*fbocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its ib +9a9plm o4 rpd5xd9 u-/mt/+ owr y/rkyaka*nitial height. Make a statement about the direction of the velocity and acceleration as the9ly+ pak t-rm+45ard*/9owr/xuam/odkbp y9 ball is coming down.

  Suppose a ball is thrown downward in yns5s d gcu1)zt 3 byq3;w32bqthe absence of air resistance. Make a statement concerning its acceleratiod1sb)3 q tyz ubc;wn y3gq523sn.

  Suppose a skydiver jumps from a high-flying3n hu3db-wj *wq:2chf plane. What is her acceleration when she she reaches terminal vwu*dchh n:3j 2fw 3qb-elocity?

  A ball is thrown verticalur4:+bkkln2 z. qa9 , xuwlqh0ly 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 second ball go thakak. x0bnulq 2h,qrzl9u 4:w+n the first ball?)

  Ball A is dropped frox:reg-b)l)x 0 tzbk1 sm the top of a building. One second later, ball B is dropp k sbxl 0tzg-e:))b1rxed from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a b2a)jraav)4ti .mmw s;uilding. One second later, ball B is dropped from the same building. As time progre).t j2iva4wm;r a) smasses, the difference in their speeds

  Two objects are thrown from tkszkx8n2*t c5he top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the stn*zk2 xts58ckreet?

  A brick is dropped from the top n yw/v t eitkvnd 6zl/nq6 81ry+)kr;.of a building. A second brick is thrown straight down from the same building. They are released at the same tk1rk nv+8.tvwltz/n nid; y/ry6q e6) ime. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with co; qiq.wm z3ixgsrl ;5)nstant non-zero velocity in the +x axis. The position versus time graph .x;gz i;lr 5sm )3qiwqof this object is

  An object is moving with constant non-zero acceleration in the +x axis. The 0 /i+aokbaf/d,irsn :6y n hy0vvn 88pposition versus time graph o aspr+b y n/vh ok0nyi:6d/if80 nva,8f this object is

  An object is moving with constant non-zero ve;;wuvow)t 1zglocity in the +x axis. The velocity versus time gr ) z;gw1ov;utwaph of this object is

  An object is moving with constant nonta. 71w hdkpb0-zero acceleration in the +x axis. The velocity versus1ka d0tpbh7. w time graph of this object is

  The slope of a position versus timendwyrzl 36 q58(u6xdt graph gives

  The slope of a velocity versus t9d9-m4h57spgyiu tvepq of3 yql7-2 l ime graph gives

  The area under a curve in an acch;g ovq+ /n4h0m bk5dgeleration versus time graph gives

  The area under a curve in a velocity versus time graph4:w tp*l+j;egpewd 1k gives

  If the position versus time graph of an object is a horizoncox,x6fhp, 3ital line, the object h x3ipfo 6cx,,is

  If the position versus time graph of an object is a vertical s-23 skpvua +kline, the object is+ apk23s kuvs-

  If the velocity versus tybuxh ) 1pm9lp-5gqq /ime graph of an object is a horizontal line, the object iqxulhyp)pbqmg/- 59 1s

  If the velocity versus time graph of an object is a straight lin.2 yhbax,:txlxfg) no1o 0dd ;e making an angle of 30 degrees with the ti,:hg x.d;nyo a21x do tx)bf0lme axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both5p r9xn3 4 ym4wvt.xnp the distance traveled and the magnit4t pn xyxwp9r3 4m.nv5ude of the displacement vector.

  A boat can move at 30 km/h in still water. How lob3m7hq w/ yk:f936c lkv2fstung will it take to move 12 km upstream in a river flowing 6./y2 c6wtus3:7mq bhk9fkfv 3l 0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 mh91x ca. mxdlp./eoce m7a +-n)

  What must be your average speed in order to travel 350 km in 5.clk8,6spzg/u 15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 m4yd.*stkck. p in. What is the average speed of the ruk4y tpk d*..scnner in m/s?

  A car travels 90 km/h. How long does it take for it to travel n,j2 4jgn/bbs9fj9 i: s6heq w400 km?

  A ly (light year) is the distance that light travels in one yjxz2:cx;ek w /6eac5 hear. The speed of lightxhz5:xcee;k /wac62 j is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you ls2p ( ;42tpoxte fi;zmook to the side for 4.0 s, how far do you travel du ;pfzmte(2i pxso;24tring this inattentive period?

  If you run a complete loop around arb .;lja)gyzr ap8c pk* ,(bn7n outdoor track (400 m), in 100 s, your average velocity ilan.ygr 8;c(zjpba*, k pb)7 rs

  A polar bear starts at the North Pole. Iw- -h-drf1ys3;1qcg; donjx xu1 ;a iot travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starr3sd-iw;;- -hycnoxa g1q o;dxj 1fu 1ting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km ( 1/i /xb+vz;rhywqkssouth, then 1.0 km east, then 1.0 km north, then 1.z;y/ qvi/1(wrs x khb+0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on21liklj- idu; a weekend from school at 55 mi/h for 110 miles. It then starts to snowi2l-i;dk ul1 j and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 hk:4rzr9m0ml sgc,te. ,y* 60 8 ictdfod coc(km at 100 km/h. What is the average speed of the motorist fh tc0m eg*fs kcr:. m0cz86rt9,o,cd yoil4d( or this trip?

  A motorist travels fusj2 qzf /o-h(6enb8aor 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her averaj2u8bsn/o -hf(qz6a ege speed for the trip?

  An airplane travels at 300 mi/h south for 2.00de6v m 1hj pz :*mro:6uzz(/aps,mi9o h and then at 250 mi/h north for 750 miles. What is the average speed for the trippmed:m(,/hzzios 9 rmo*zp 6u1v6:ja ?

  In a 400-m relay race the anchorman (the pe9lj 1yq3n.yhk 8bu/e dovd6+srson who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 3dd u1.yhs6yvq nj/8klo b+e910.1 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?

  A car decelerates uniformly and comes to abdk9kpcayg/x ak: e9,u 8l9g* stop after 13 s. The car's average velocity during deceleration was 57 km/h. What was the car's decele ,l xa9/9pe9u*:ckdg kb8gyk aration while slowing down?

  An airplane increases its spesm nj3nc 4+dh,ed from 100 m/s to 160 m/s, at the average rate of jncmn,d3 4 +hs$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at th4rktl jld/ 2kgu3 .vn(jxrb 79e rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelels )r (fuw h7u9mr)dz+rates 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?

  A car travels at 15 m/s forx ahmo*; *f1tb 10 s. It then speeds up with a constant acceleration offxht o m;1a**b $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.2 m/s experiencesyz/.soh3 h dq6.xd4 t/bm:udd a constant acceleration of . 3yobh4:ddmudsdqt. h z/ /6x$4.8 \; m/s^2$. What is the cart's displacement during the first 9.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed 6ii+wrk8;e.i 4 ghq ehof 349 m/s strikes a sandbag and p8 4hqg6+ er.wikhi ei;enetrates a distance of 51.50 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched frorfyy gu7swp24l007tiu0 ev p-m a catapult on an aircraft carrier. It reaches a sv yp7fsi0u2 0lt -e4yur7wg0ppeed 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 the catapult?

  A car starting from rest moves with constant acce-n5wa,ugk bc 2h -jpp0leration 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?

  A car goes from 40 m/s to 80 m/s in a dtb2g0trw - -9q pj.wy d,o+rjeistance of 200 m. What is its average acceleraopbw,g0r - yrtj2j9.+t qe-dw tion?

  An object starts from rest and undergoes uniform acceleration. Duringg9k x;zqotrbxgn; 2d1m, ) c6c the first second it travels 3.2 m. H91gz b;mcgx6or,d;k q) n2xtcow far will it travel during the third second?

  An object is moving in a straight line4dmn588yqb( c9v hn34gyc ;rgibn 4uy with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is travely5gryq 3;( g4 84bmhn4n8buyn9cvdci ing at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerat:zc4q k579v j 4mlda-frtb9tbes 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?

  A car with good tires on a dry road can1 xr t,7osfeww*kvf7 - 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car,x hhxgu 1hv.) that has been waiting at the intersection starts ahead with a constant acceleratiu hhx,xvh.) g1on 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.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s o+aq5jd4: -*uefm 2ty3i pwwion the surface of planet X where j 35+4t2ww*ui m-ie dqyfo ap:the acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward withmdt 0zsmnvgz)x6n* 1) a speed of 12 m/s on the surface of planet X where the acceleration due to gms6 * ))dg0tvnzz 1mnxravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 mh8.8f t6d,mvui)nl6b-dwm lu /s on the surface of planet X where the acceleration due 6)v.8 nmbui6mhu-flt wdl , d8to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the surfa 4atzldk3i x 8l,-zvvp+gn -9dce of planet X where t3dn -adllvzg8k,9 v ip +t4xz-he acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually gread81spo( f ;d;mvmycy*ter than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to * ov8dp( ;dycmfsy1;mfall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity afterdpt0t+hf *mn7 3.0* dtnm0fh t7p+0 s?

  A bullet shot straight uqovo;q0 , +vpduf4vf 2p returns to its starting point in 6 s. What is the initial speed of thvv02qo udf fqp+4ov;,e bullet?

  A ball is thrown straight up with a speed;h0q+md, xlh i of 36.0 m/s. How long does it take to return th0m+; ,xlhqid o its starting point?

  A ball is thrown downward from the top of a building with an mdvz1a77l/+ fni.2ugb z u01os okf,yinitial speed of 9 m/s. It strikes the ground afterf/d l0z2 .ufoy 7z7okbgnua +1iv1,sm 4.6 s. How high is the building?

  A ball is thrown straight up with a speed of yqq*3 hs syiicbbj0 .79;y g6+caei5d 30 m/s. (only fill in numerical value in the blanks y70+9qqdiij b6c 5 aysec; g3b.si*hy)
(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?    $m/s$

  A foul ball is hit straight up into the air with a speedef5 ; d *a3lj)jlpe5rx of 22.0 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 12 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 s?+j(l yes1 i9do

  In Fig. below, what is thkg wr3az:aw*lf +u(y)x ogf9qn 1(*rme velocity at t = 2.5 s?

  In Fig. below, what d0ie;m0z9efq av1 h0 wis the velocity at t = 4.0 s?

  In Fig. below, what is the v d d7m;zu/vbjs1j*-bhelocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s b:an*9rmyz b: f0a-:x wldrr/?

  In Fig. below, what is theu h 0ii99zp.-mtyia r* average velocity from 0 to 6.0 s?

  In Fig. below, what is mn m5yxt;*z4kthe acceleration at 1.0 s?

  In Fig. below, what is the ro (31 ipdcc:vwff08*morw (sacceleration at 3.0 s?

  In Fig. below, what is the average acceleration s:.z *4+)zbs1luysqqca5cqnh ; 7qiqfrom 0 to 5.0 s?

  In Fig. below, what is the average amr8gkz 326oev bn.rn7cceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to gp+u 5vxaf i8qp g7 k.u1w8d:t8.0 s?

Does a car speedometer measure speed, velocity? {speeg5jv neb+ z37,amkl +td|velocity}

  An object can have a varying speed if its velocity is constaky sv3 0a:zw8et t.y:ant.

  The velocity of an object can be negative when its acceleration is posgso3kv77b+ p 5r4qij9 2qede sitive.

  If one object has a greatekgmj)j/9dv 7 jr speed than a second object, the first must have a greater accel k)mj jj/d7gv9eration.

  Two cars emerge side by side from a tunnel. Car A is traveling-2( fph if-zpp with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increas da9- hns-,s1 j:;yh+ yh d6yk:muudwjing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leavebpr eu)vk.rguh0jb- kw4m,0 9h:4tors the bat with a sperj)w4bo mv , 4ukbkru.p:t0h0ehg9r -ed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happening tju5 6mdh*m2/ xvnt 0rqo its acceleration, how does it change if air friction is igno6umvx2hq jm*r d t/50nred?

  As a freely falling object speeds up, what is happening tckyve ti/260dx w;1 zfo its acceleration, how does it change if aiwe tvzx 6 ;yi0k1d2c/fr friction CAN NOT be ignored?

  An object that is thrown vertically upwardiv2ty e rrrrr5m s7j24/ kf9-v will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, hor9f 2js-mktr4/ve 57v irr 2yrw will this result be altered?

  An object can have zero velocity and nonzero acceleration at fcn b5p:ab qfc+: ej()the same time.

  An object can have non6: snwshy bu24zero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making n) b4k ughe(m+r) /nvvjo stops along the way has zero acckv+ )vbhr 4gj/()n uemeleration all the time.

  A rolling ball moves fro-*, ap-m 5qqrwagrwmd h792jwm $x_1=2.2 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.7 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps arous v5 sx/3 0fjg(t/yulund a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, moving 86 m 2z 5u;e87e rr+lt3(ej spg tmeaway in 10.1 s. It then turns abruptly and gar e2r(;tpule5 8t e+ejz7gs3mllops halfway back in 4.7 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates frva o4s-7cbh.q0tg) ocom $12 \; m/s$ to $23 \; m/s$ in 4.2 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down froc 8puc7wt2u9 o 4iv4wjm $16 \; m/s$ to rest in a distance of 61 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re:ni ::4v7doh qvm(sx;mc3fzd ach a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top sp51tmhss91s gmnf)cqk2 x8 : hi. 7 xlrytie;p/eed aboutmi82;h/.l e sx)95p1m qhkt1n sx7t:ifcygrs $10.2 \; m/s$ in the first 11.8 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speip;stz+ifr7:.r*z:oq ho3fem-z ( nl ed of $20 \; m/s$ to rest in 4.04 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m hax5)n a2tw1diz2g 3ulong on the highway. Assuming a deu51dt xz2ia w3h ga)n2celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trucx ,hk0tz t/au;/nj84lrg 1 nauk going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. After exatt1 d jxb*3zmtj)6za8 ctly 27.0 min, there are still 1100 m to go. The runner must then acceleratj m3zxt 8b dajt6t)*1ze at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$