Suppose that an object travry2 h7*dqb60r*k mf d h1ndgw5els from one point in space to another. Make a comparison between the displacement and the dy1n0*ghk2mrdh 6brdw *7fqd5 istance traveled.

  When is the average velocityzu *87c8cs0 s uimv4 fws7 ra,)n2vqpb of an object equal to the instantaneous velocity?

  A new car manufacturer advert0uq 7hcnlu(+riy rc84hzw 9 m(ises that their car can go "from zero to sixty in 8 s". This is a descrinczrrhhu l0q(u748my9 +cw (iption of

  An object moving in the +x axis eer5,tg/o zs)wxperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to t09lm7oh:h yy s 4rl;ijhe East (+x direction) begins to slow down as it approaches a traffic liy:l97ohy h s ;04mjirlght. Make a statement concerning its acceleration.

  Suppose that a car traveling to t)j +7c 6jd( kzd xg,6i/7kb4imzepo,wz9rtng he West (-x direction) begins to slow down as it approaches a traffic lightn,k,zbrcitoj gz 6 dgpjx+6d /wzie(7)49k 7m . Make a statement concerning its acceleration.

  Suppose that an object is moving wb 8 50yqly:fxlith a constant velocity. Make a statement concerninlb50q yyl8:fxg its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zerody1,aifr ir8 )? Support your answer witira1ri8 ,) fydh an example.

  Can an object's velociyn1n7i jt -vk-n:h bt-ty change direction when its acceleration is constant? Support your answer with an exampln-j7t n1bn ki-:v t-hye.

  Suppose that an object is moving with constant acceleration. Maktvjo/5mexfs,+87t ap e a statement concerning its motion with respect to tvt,j/o mpxet5f sa 78+ime.

  Can an object have increasing spe6 6.wedhvgx+d jg:a;r tgav* 440frw ked while its acceleration is decreasing? Suppo;t4:xggw+r v.h0g4 j aarfk*w6dv d6ert your answer with an example.

  Suppose a can, after an initial kick, moves upmh 25, 1ysmqpr along a smooth hill of ice. Make a statement y qm1s,hr p2m5concerning its acceleration.

  Under what condition is average velocity equal to the k 6mim;m e/ed6 0q :wet*8, pobqx7zmcaverage of the object's ini b7et mq/i,c86o*md we;qx6z :p0mk metial and final velocity?

  Objects A and B both start at rest. They both accelerate at t u474z0jf6 2leuubv kthe same rate. However,eb4f t 40juk26 v7ulzu object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from r) zw,j2pd4f4c, hmbqx,h 7a ,d .tpjheest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Wh f, .zcpebd2,,)4jxaqmhj4dh, pth7wat is the distance traveled by object A compared to that of object B?

  When an object is released from r ktd.ma 5z,ll x6(dms9qr p)0kest and falls in the absence of friction, which of the following is true concerning s (l650 k9.l am,dkzdrpxq)tm its motion?

  When an object is relem,s (csknd0*dejcw9:sw2yc85 :tg xnased from rest and falls in the absence of friction, which of the following is true contymdgn*j2 kss: se9c c,wd(805 xcw:ncerning its motion?

  Suppose a ball is thrown straight up. Make a statement a+nsen 4oz*uus 1 sia1mmm +z-ds,67y 2nsqp:qbout the velocity and the acceleration wdss2snp4n +zmqmiuy+1u q7eos *s:z, 61-ma nhen the ball reaches the highest point.

  Suppose a ball is thrown straigh98vn -. iklmyzt up. What is its acceleration just before it reaches itn -zvm.98ikyl s highest point?

  Suppose a ball is thrown straight up, reaches a m1equ-ybpqx 48b48 at daximum height, then falls to its initial height. Make a statement about the direction of the velbaq8 4 pu4etd8 q-bxy1ocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initialn0tbi7n6u),/h gc gm l height. Make a stabu/lt g,07m hgnn)6ci tement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown down1u .ndunxlv ,7ward in the absence of air resistance. Make a statement concerning itlnv7n 1x, duu.s acceleration.

  Suppose a skydiver jumps from a h;n3 a0h*rj o8b6 ultk0c*x cmnigh-flying plane. What is her acceleration when she shh*3b kx*0tj;nl6occ m0r nu a8e reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An nt2; vvn)j;n9dfkq -d6dl 3ri 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 firv9)6nl k3 ddt2d j-ivn;nrfq;st ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second lateq e1ly.t 3npep5c.k 6mr, ball B is dropped from the same building. As time progresses, the distance between thel.kynmt3e5p1 .qp6c em

  Ball A is dropped from the top of a building. One second later, ball pj.)x sdb ye4.al7p 7pB is dropped from the s. p.47a)jb ps pyxle7dame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, an8y 5o3)lnpq 4mgix)t nd the other is thrown down, topq 38m y gxil4n5n))both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straighqt2ik-n1q o7 yt8fi +st down from the same building. They are released at the same time. Neglect air resistance. Compare 2 7y1 qqittn-8+ofkisthe accelerations of the two bricks.

  An object is moving with constadblz1gh0xi2y3/q1 * 4 ydm; vugx hym(nt non-zero velocity in the +x axis. The position versus 1lbmyy u4xgxy(zh*g;1 vd/ i0dhqm2 3 time graph of this object is

  An object is moving with constant nony6 pfovi)gv,bqt 6c5vg 499jc-zero acceleration in the +x axis. The position vgjv4 yfi ,9tgcv6 p9co6b)q 5versus time graph of this object is

  An object is moving with constant non-zero veloci wl9v t:j6.nsvty in the +x axis. The velocity versus time grantw 6l.v :js9vph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Tc:1r rvu mlb ch 0y7;k+rzx-r6 f-dez/he velocity v zvrl rcuxf7 -r:1 -60hrye/zbc;+kdmersus time graph of this object is

  The slope of a position versus tima,jt+wu*71k zr wycs*e graph gives

  The slope of a velocity versus time gr.37d( di,qij,z-; e)e i sj4uk yremumaph gives

  The area under a curve in an acceleration versus n .j.tk6yc 3sctime graph gives

  The area under a curve x:5t q ;4dzriti*q.idd1g;mb scld7 5in a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the oile4 2;yt/vwv bject isw i tyelvv2;4/

  If the position versus time graph of an object is a vertical li9 c nod-nag zrrm/p/+(ne, the object is- /dg ma+/9 o(nnzrpcr

  If the velocity versus time graph of an object is a horizontal line, la *feg,c2:tm the object i fgealmtc* ,:2s

  If the velocity versus time graph of an object is a straigfvqno16e8+v uax73 tmht line making an angle of 30 degrees x6a o8e vu3f+tvnq1m7with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m soutqo/ e*bz.4waj h. Find both the distance traveled and the magnitude of the displacement a/4e w .qozjb*vector.

  A boat can move at 30 km/h in still wakwkh ger-w;n,:2 vj:ygbpiuo,)( 6fb ter. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?kg(w-uk: e,,jrhbbn of: gp yi 6)v;2w

  55 mi/h is how many m/s u d.r l kj(vrc5:vjbm mi7o2-+/al:sp? (1 mi = 1609 m)

  What must be your average speed in order nze-5(;grtwt to travel 350 km in 5.15 h?

  A runner ran the marathon/w r tyw l+cqwoop3m6,)c8gl hu z2d29 (approximately 42.0 km) in 2 hours and 57 min. What is th toz6y2md,l8w/29cwgc ) hl +pqwou3re average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to trav7 50r 1qiiyd*js. zmhxel 400 km?

  A ly (light year) is the distance that light travels in n;.x0 ybz0mbu,x (y jbone year. The speed of light iuybz.;0mxbj (nx y,b 0s $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h jqytpe 3k+v5fir(m/ ;along a straight road and you look to the side for 4.0 s, how far do you t qrmp5j 3yv+e;k(t/f iravel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avera 6 stwyu+ 2eb;us3)jwpgp6uj;wwtus s 2+ )e3bye velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 kmiuyl k ix.u-1y6pt,4m east, then 1.0 km north, then 1.0 km west to returnuy.61,tiy4i-klmu xp to its starting 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 south, then 1.0 km(+wen sou0rl 4 east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. Wo s nue+rw4(0lhat was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles.sdegu d u)752fm coq 2r7y5*j6vcsg j, It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours cj7)2eqo dgg52s5ruy c duf* ,7j6smvand 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the av.spy ( vwz4d8cerage speed of the motoris .sdvyz4w(p8ct for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What yo.rij1k/d) cr1zv.co q w j/3is her average speedqr j .3)./dvz /o1yorjc1kw ic for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h norn.i sql dr/4:bth for 750 miles. What is the average speebl nd :r.q4i/sd for the trip?

  In a 400-m relay race the anchorman (the per6 vz9 h(k( s:)klsl87ddvpwpxson 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 10.1 s. What is the largepk( 7(dhv6k9 8sxlz:s) wpdlvst 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 a stop after 8 s. The caqd7 xmx ,m:m -mtk0ea5vp f6m+r's average velocity during deceleration was 53 km/h. What was the car's decelmqt:5md a0emxm,v 7 f-m6kx p+eration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 72; mp i ,)wsvqo a)z b*z*n0+ huw*o-tppntouq t,p)ooa7bw-ovmt 2zun+0 *;ws ph** zni)pu$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates ag . *ocjad6xvf8s p8,lt the 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 accelerates at7/sqlx vfl:vk0wzb -.+ss0 nq $4.0 \; m/s^2$ 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 for 10 s. It then speeds up with a const4j9. szofp/u*-pp mtx ant acceleration.-f xzotj4 /pp9s*pmu of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.2 m/s experiences a bn; wsnq ei*(lwq 2 amw213q/kconstant acceleration of iw nw1;*ln 2w/2( ekqaq3bsm q$3.5 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontally 4 /q 3w8 huh.esgy i4cw 1ycw98hr0lkbc6isl8to the right (+x direction) with a speed of 468 m/s strikes a san4r3ici .8ug h64q19yslkwc/y l0b8c8whw she dbag and penetrates a distance of 21.63 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched frv +rowc-tgm 92f+n 7xtgvn oj3cd4,se g,v5o/ om a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of tm /v,veoxgdr+o9-45on+ gwt c 2nc t jfg7,vs3he catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest mo+7kq*2 rwxv nlnefp o8 /u,)vwves 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?

  A car goes from 40 m/s to 80 d +kko0ihs/+pm/s in a distance of 200 m. What is its average accelk0skp+do /h +ieration?

  An object starts from rest and undergoes unifohdh 6du(.q)gfk w6;asrm acceleration. During the first second it travels 3.7 m. How far will it travel during the third seco6s)uqa w6gfd dh.(k;hnd?

  An object is moving in a straight line with consts tu8a9ani)u8b k8wb7ant acceleration. Initially it isbs8tiak8) 8un 9b au7w traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelera k:6)b;jo+ggbpa.xea (mezuuh9.n7 ;fq(m hqtes 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 can decelerat201b 2hp56myylo.. u e0u eqbgcb2bghe 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 greed9s29p/)i l dzwk ik.sn, a car that has been waiting at the intersection starts ahead d9sisz.ldk /p2kw 9) iwith 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.    $s$ (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 on the surface of pla0kmt6m - d8eejzn j/i3net X where the acceleration due to gravity mt/0je djezik38 6m n-is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on ;o;tftmv)4jah zh.k/zzspt*yc:0 y7 the surface of planet X where the acceleratio 7h*y4)t vj; s: cfhtzz0oa/tmykp; z.n due to gravity 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 u*51 zco7(o7f qzmcfi y-lh/espeed of 15 m/s on the surface of planet X where the acceleration dueoy fli/ mc1zzf(hq5u7- c *7oe to 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 surface of planet X whekdyobwb: 9f59(1f z fmre the acceleration due tko915z ffdy f mwb9:b(o gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greor;yo1f9kz+tl r 9 k)water than 0.10 s. If your friend holds a ruler between your fingers and releases it without wak9yw lrk ) ;oz+to19frrning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocyyi )m n kpw.g m6i-dp tf-wu5*2z+,r)fmw.ywity of 19.6 m/s. What is its velocity after 3.+w dfi yw5-ykymm zwp.-) f*62tgnu wmr,p i).00 s?

  A bullet shot straight up returns to it;- 1trn)dkclos starting point in 19 s. What is the initial speed of tn dr kot1lc)-;he bullet?

  A ball is thrown straight up with a spewim9ea.b 6 yu;ed of 36.0 m/s. How long does it take to return to wa ;ibym. 6e9uits starting point?

  A ball is thrown downward from the top of a building with an initi *v2gk5s undz x:4m.bwal speed of 16 m/s. It strikes the gr sk2zx:*.gn4ud b5m wvound after 6.4 s. How high is the building?

  A ball is thrown straight up with a sp mia,por)eq4 5+ed-gteed of 30 m/s. (only fill in numerical value in the bla4a,d+re t) e5p mqgio-nks)
(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 sv 4,bu4)zgjt fx3i)wt peed of 21.9 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity a94zklgi q2s+6k jf1q rt t = 1.0 s?

  In Fig. below, what is the vj, l* iioqe5mb 80zmx+elocity at t = 2.5 s?

  In Fig. below, what is th;2+qyo ,(3qz7 )jhogz w nydx7a mps8ue velocity at t = 4.0 s?

  In Fig. below, what is .b6ltcit*o9uqza ) v.- zr, psthe velocity at t = 5.5 s?

  In Fig. below, what is the average velocity fromg+rrr(xxz.;whcd.k8gv0 :d e 0 to 4.0 s?

  In Fig. below, what is the average veloce(lq.p kgm9yesz2)mn x5*6/fyf c4 tpity from 0 to 6.0 s?

  In Fig. below, what is the 8/yago pyotvv79hr3. v mx6+6hx,yj lnig- ;xacceleration at 1.0 s?

  In Fig. below, what is theui4b q-j7g yy7 acceleration at 3.0 s?

  In Fig. below, what is th0g-nr5inpyum00j)x 5mi m )cfe average acceleration from 0 to 5.0 s?

  In Fig. below, what ii8 *;mr:yzv dcs the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 s?a:+fk 1ca.f 8( as j2oqh9liqyu2kj+ ;sn p;wc

Does a car speedometer measure speed, velocity? {sdr+q(3p ieku)w k.r/npeed|velocity}

  An object can have a varying speed if its velocity is conu-ybdivf )5j1 stant.

  The velocity of an object can be negative when its acceleration is positiva (77mh1qctof e.

  If one object has a greater speed qsz5flp /ir9j7zt 5 f6p- 3lcrthan a second object, the first must have a greater a3 t5qf jpr96f-7p5/ lsrzz iclcceleration.

  Two cars emerge side by side frug+s:;s tpfu;cafd -pb, 2u:e om a tunnel. Car A is traveling 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 increasing in speed as its acceleration decreasese71g/luqoy(vo /d2h t .

  A baseball player hits a foul ball straight up into the air. It leaves the bubq4c1 (sul3bp-asz8* ixh u8at withu31b ls p sc8uxhuzb*ia8(4- q a speed 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 obn3tw3jf8ckup e.60z a ject speeds up, what is happening to its acceleration, how does it change if air friction is igno e zp6wat.3fcj380ku nred?

  As a freely falling objqurts sk+c 18)ect speeds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ig 8c1 )qrsksu+tnored?

  An object that is thrnx/yyi;h+1s (9.f 0x d6xutnmqt fzp;own vertically upward will return to its original position with the same speed as it had initi0xp.nmxi;fsy ftn(ty+zu 1 /x 69hq ;dally if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acwpq 5/xati s hnen/ iv.589ee4celeration at the same time.

  An object can have nonzero velocity and zery nint67r5m 6rph 3mb4o acceleration at the same time.

  An elevator moving from the second floor to the fifth floor m3spuw0spq gv,41l t8m aking no stops along the way has zero acceleration all t,wu1g8 3vs0 m tqs4pplhe time.

  A rolling ball moves fromz. g t07nnye*labqhr4 wx28k8 $x_1=3.0 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps app6ne2a 4zzp3 round a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.8 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, movize7iyqd )m zh9wo *(.nng 114 m away in 10.3 s. It then turns abruptly and gallopo mw 9*ien.z7)(yz dqhs halfway back in 4.5 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 frodbdo4(8 c gwr;m $11 \; m/s$ to $24 \; m/s$ in 4.1 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 frod 4 b/da m7k4mjphg. od:*nui;m $23 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spee7+z w5lwx8uu td of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top s8rvqir1myhz(m /q 2 tk)h5 9vfpeed about kz8y hiqf5mh)vq/2tr 9rm1( v $11.1 \; m/s$ in the first 10.7 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 speedk-z *bh)n2wtu of $16 \; m/s$ to rest in 4.87 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid ma,z cb9f*rjdg5 igm .e.rks 92 m long on the highway. Assuming a decelerationjfz ,re.5mcgi 9g*d. b of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go6 n fmlppj+,gsc7*-d/cx 5gme ing $25 \; m/s$ 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).    $m$