Suppose that an object travels from one point in space to another. Makj2npn9b;0d adbb9i-c)v9hj g+ tme g/e a comparison between the disp)pnb9 d2im/gh9;ge+j b 9ab0t jd- cnvlacement and the distance traveled.

  When is the average velocil (h;a(svm j6yty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can glb4w2ems ;uo 7o "from zero to sixty in 8 s". m lw7ube s;42oThis is a description of

  An object moving in the +x axis experiences an acceler9cq enl) 9e to;sgq+a*ation of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directiow2lt4 s4luvf.6ckl)hn) begins to slow down as it approaches a traffic light. Make a statement concerning its ac.l lucwh)64fst2lk 4v celeration.

  Suppose that a car traveling *3c x;0wdlc+emviyy45w.a mv to the West (-x direction) begins to slow down as it approachia +w0wy mcd*5ecl;vx.4y3mv es a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a st5y/1 pliyh4kl j5kh li4dpsi(586fzj atement concerning its acceleration.4p4zhl6ihsij(kfy5pl5 5kd/l i yj 18

  If the velocity of an object is zero, does it mean that the acsf :yf, w) qq20xyrx-zceleration is zero? Support your answer with arxs20yzyqq , x:-fw )fn example.

  Can an object's velocity change direction when its acceleratidbva. dpi-+(2ery t8d on is constant? Support your2i(r. ya- +pd dv8btde answer with an example.

  Suppose that an object is moving with constant acceleration8 a7wpm 1l g89s+epylf. Make a statement concer l89l sagw8e7pp1y+f mning its motion with respect to time.

  Can an object have increasing speed while its acceleration io/ xpgc5+ mn.as decreasing? Support your answer with an exampc5 x/+.gno ample.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Makecwv h0,8 fgpg529tjyhryx)p3vz 8v1 n a statement cp xvg)9gvzrvy h cj8805fp3wt, 2hn1yoncerning its acceleration.

  Under what condition is average velocity equal to the average of the object's fmu, 3 -dk sxs:d,:pqk5x nj)qinitial q,:-kps j)x3m sux:kf,d q5 ndand final velocity?

  Objects A and B both start at rest. They both a m5r: :9as5:inhknlj zccelerate at the same rate. However, object A accelerates for twice the 5k::nlr:9an5hzs m ji time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both 1qd+(:shqjk h start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by obje1(sq qh+h dj:kct A compared to that of object B?

  When an object is released from rest and falls in the :z 8j)mt 7bxeqabsence of friction, which of the following is true concerning its :ebz8xt m7j q)motion?

  When an object is released from rest and falls in the absence of frictdm subt +gc20sady :99ion, which of the follows:bd2aty sc+0ud 9mg9ing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the vela 6 rypf(dzth,0 o+glj:lw(c7ocity and the acceleration when the ball reaches the highest plhja(c go(06zf+tdy p: 7, lwroint.

  Suppose a ball is thrown stra6 u4(i..k gltk0yvyc aight up. What is its acceleration just before it reaches its i0kt.g4y.lv6 ky( a uchighest point?

  Suppose a ball is thvsrwktmh. rx0;lqj-v1:5yw; q1 irc(rown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going q5q.t1xsykjvv(wwh- m:c r r1li0; r; up.

  A ball is thrown straight up, reaches a maximum height, then falls to pf6 7meeu1pi rk)2r)s its initial height. Make a statement about the direction of the velocity and 12p fer)pu6 ksmi )re7acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Marukn./ *zwhq 52rx obb9-e 9mqke a statement concerning its acceleratb zxne5 qb rqh9-m .okwu29*/rion.

  Suppose a skydiver jumps from a highg 8/j/yq:v yat d1gg0m-flying plane. What is her acceleration when she she reachest1// yg:ajydggv 0q 8m terminal velocity?

  A ball is thrown vertically upwv5am3 n j*inwrfu8k))ard 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 thimwk5)u)fn*r8n a3vj e second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buildhpr,+f9js:r i ing. One second later, ball B is dropped from ri,+h spr:jf 9the same building. As time progresses, the distance between them

  Ball A is dropped from the top ofc: z3at8da )qm a building. One second later, ball B is dropped from the same building. As time progresses, the difference in their smcd:8at) 3 zaqpeeds

  Two objects are thrown from the tw c)f/epff 7;zop of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed.ff)zfe 7p;w /c What are their speeds when they hit the street?

  A brick is dropped from the top of a building.rx 7a 6d47jg4*gmwogf A second brick is thrown straight down from the same building. They are released at the same time. Neglect ai47a rdmw4 gg*o67jfxgr resistance. Compare the accelerations of the two bricks.

  An object is moving w/k,p8 nik h+nuklf 3:qith constant non-zero velocity in the +x axis. The position versus time graph of this object i/ pq:u3il,kknnkh+ 8f s

  An object is moving with yya1r.e)u30 8 zfeyxbconstant non-zero acceleration in the +x axis. The positiz1ufr .8abyye) yex 30on versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x ag++ac9dj m;q gxis. The velocity versus time gra j+cga9qgm+;dph of this object is

  An object is moving with constant non-zero acceleration in the +x z v wf*6(4ojnisie,f.cp2p 9u axis. The velocity versus t ve6 ,soj.c2uzfp4(* wfp9niiime graph of this object is

  The slope of a positqi0h :4 wvd1y.kwmk1b ion versus time graph gives

  The slope of a velocity versus time graphzd6p.cxa5im18xe m ;f4(y tts r4/jq n gives

  The area under a curve in an b-qq 4 r(h,u6rjv c+ie54nmxxacceleration versus time graph gives

  The area under a curve in a velocity versus time graph tip xz+i8 vo:*gives

  If the position versus time graph,jxj1nw7 1akte (2k)tf5o11 nrtwxcf of an object is a horizontal line, the object ion 1e t72 kx xjkf,t1a f1j)ctr51w(wns

  If the position versus time graph of an object is a v*dlxm( 0pp77hhq s- zwertical line, the object isz *7-phlmxph w7ds(q0

  If the velocity versus time graph of an objec-a8e-h1relkl4o q;mbius 4 x+t is a horizontal line, the object 4sl;rb l4ioam-8uhx1 e-+keqis

  If the velocity versus time graph of an object is a straight line maki4+ p5y j lftioy*-zw6yng an angl5l+4yj6y ift wpo-*zy e of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find bot 6o+2yb nvpfhj0rk)o 8h the distance traveled and the magnitude of the displao02poyv +b)k 8nj 6fhrcement vector.

  A boat can move at 30 km/h in still water. j/k;. ln /m;i da4 :kfep /bhxs*ectu7 How long will it take to move 12 km a4tn k/e 7c ibxp;hl u./f*jkm e:;/sdupstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? 8 r6udo+k m.ijyu,m (hrf8 t7*hbe:yj(1 mi = 1609 m)

  What must be your average speed in orck7 vhmlmu 6(t26r7 9rgi3y jtder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately k thh0z cfpw9(r z+,;v42.0 km) in 2 hours and 57 min. What is the averagewv,kz ptr ;hh9f+c 0z( speed of the runner in m/s?

  A car travels 90 km/h. How long does it take6lhhl02dqll0*m ) h-liudme-ygy s(7 for it to travel 400 km?

  A ly (light year) is the distance that light travels in/gbr 55zdql5 eg)k:u r one year. The speed of light 5dure) /rlkzq: ggb55is $3.00 \times 10^8 \; m/s$. 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 loolncr;vh8.k y1 -bo sp/k to the side for 4.0 s, how cp.rvoks;b nl-1h/8yfar do you travel during this inattentive period?

  If you run a complete 10gs bf gqr4+; nn96h /qnqs:r gasv+hloop around an outdoor track (400 m), in 100 s, your average veloci6 hgf4qn0gsg /rs+asqnh 1r 9:;vbqn+ty is

  A polar bear starts at the North Pole. It travels 1.0 km south, thenqt7c r06f stgex,jf(/ 1.0 km east, then 1.0 km north, then 1.0 km west to retus(g0fqc67jft ,/ter x rn 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 1isyh v)*hep/fehw s p8 n2/s/4.0 km south, then 1.0 km east, they2sh p/4ssew/)i*p /hnvh8ef n 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. y,c(3l)mojy arcj (lgd6p88l It then starts to snow and you slow to 35 mi/h. yll o dp(jrj c y8m,(3g)lac68You 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 km at 10;u-0:fu zav efi mt.e90 km/h. What is the average speed of the motorist foia:.0vfm9ufte uz;-er this trip?

  A motorist travels for 3.0 e6/s vom/ dr)o/p)xbhh at 80 km/h and 2.0 h at 100 km/h. What is her avera) oom/)rd6/p exbv/ shge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at p-hs xt9 d*c)k250 mi/h north for 750 miles. What is tkh9t p d)-cs*xhe average speed for the trip?

  In a 400-m relay race the anchorman (the person s8(t7ba f8gf f(milit w; a(k0who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anca(ifsb0tm( lwif8a8 fg 7(t; khorman 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?

  A car decelerates uniformly and comes to a stop after 10 s. The car's avera k l(ga-;bdi/m8iv0hw ge velocity during deceleration was 48 km/h. What was the car's deceleration while slowing wi/8 (hlvmb;k-g a0didown?

  An airplane increases its spe-z2g;jd 0ob m+wkhhv6+k/ddc ed from 100 m/s to 160 m/s, at the average rate of 6zh+gk-v b0+ddc2;d kmjw/o h$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates k.bs a-i,y vd9at 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 arh2r(ldgk7j r *cs7sqodl ,dxg1; chyw93 25ft $4.0 \; m/s^2$ 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 theny *vc441 sg6oe9cvjrf speeds up with a constant acceleration r f4yj6sge149 ovvc*cof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial veloci ob9pfwg.5nz9 pr u(-9 (soa0*dsxjpgty of 7.1 m/s experiences a constant acceleration of n.w f0 zoj5d-*ps augr op(99bx(9psg$1.3 \; m/s^2$. What is the cart's displacement during the first 7.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 314 + i6j(ik0jf vhm/s strikes a sandbag and penetrates a distance of 61.83 cm. What is the average acceleration( ik+jhfiv j06, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from aq+vxf 9o1q( aw 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 +fqxqao (1w9v. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with cg,- zin2 fob0axv2b)5w px2hfonstant 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 m/s in a distanc+ err6l::s5op )brnilgp3,lt :x;qkv e of 200 m. What is its average accel3nl ,pxq6:t is lr); b rkeo:lgp5:v+reration?

  An object starts from rest and undergoes uniform acceleration. During thep(a7u 8tvf -bzife l4pi6r +f( first second it travels 3.9 m. How fari8pulefz(4av t p-i7b f6+(rf will it travel during the third second?

  An object is moving in a straight line wi pw-z1 / t5l7nmpw5ynfth constant acceleration. Initially it is traveling at 16 m/s. Three seconds 1/-ywmz5 l75nntfpwp later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest a1scf8-l8t*, lwuq4w+y twbdend accelerates 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 o,;*fg*;y y) wguneic on a dry road 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic lgs tg9+5vfa)y37jme g/d hp0b ight turns green, a car that has been waiting at the intersection starts ahead with jdygagmtf 3+sbg 5h/7epv 9)0a 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 .l a 1gh*,a ) stemva3zyizr43y1,rousurface of planet X where the accelerat1hrz*eo4 1 .s3 yvig tyra,a,azu)3lmion due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward (a9oup5 g gqr6with a speed of 12 m/s on the surface of planet X wheraqo5ugg (9p6re the acceleration 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 speed of 15 m/s on the surface of plx2 y d27fc7s )3mq-lgnd7z 5nvqaf)qnanet X where the acceleration due to g2)da)yg23 zvdq 7s5 -qf77qc nfnmnxlravity 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 ( 0q1jx2mttla X where the accelerationq mltt(0ax21j 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 greater than7n :77(zphmyphd- t2trn qiv1 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 fall beforidh71p7rtyztnnp2 q- 7mv(h: e you catch it?

  A ball is thrown upward at a velocity -jx 2syl31(huco r)grof 19.6 m/s. What is its velocity after 3.00 s?-hsl1 gcjyo( r3 )u2rx

  A bullet shot straight up returnsw 9fgq p.m)ba8ak 6mzr09zk(u to its starting point in 17 s. What is the initial sp 98 (q9.z)wrm 6mgabkpz0uka feed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long lh3 j u1hb:u8bgd jq(;4qlux2 does it take to return to its starting point;(hbq b4uj u2g8jqxd:hu3ll 1 ?

  A ball is thrown downward from ist82yh 8w8x du/(q, kz ,bgihthe top of a building with an initial speed of 27 m/s. It strikes the ground after 3.3 s. Hbtkwy8,uhd szh,8xg2 i(q8 i /ow high is the building?

  A ball is thrown straight up with a speed of 30 m/sc0lt8ape9;avl -6he-c sti xi/ ub7:x. (only fill in numerical value in the -8-7ecb :xaxc0a/it6 v pl ueh;ltis9 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?    $m/s$

  A foul ball is hit straight up i(us3l4 gu*u7r jv tm zv7-yrdj:1ugs+nto the air with a speed of 48.4 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 hme hlths9sep r ny3h5+3h ntf+ )2,.x1wgeu:at t = 1.0 s?

  In Fig. below, what is84kq t/f db)2egsqd)/ k;k c ifyen*i4 the velocity at t = 2.5 s?

  In Fig. below, what is the velocieyeg tu )m0)*vty at t = 4.0 s?

  In Fig. below, what is the velocibs/fy (e .+tgcty at t = 5.5 s?

  In Fig. below, what is the averag;b, tgk 59wtm/zgoj-ae velocity from 0 to 4.0 s?

  In Fig. below, what iwf:) zavs vp f-i4nmn/h9g0f(s the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?quh)*d( zx1 mz

  In Fig. below, what is the acceqz1p kpi1 o.a5leration at 3.0 s?

  In Fig. below, what is the average acceleratit:g7c;wpr(edd sgbzw+2n ; *aon from 0 to 5.0 s?

  In Fig. below, what is the average acce xbul0il pz-o7 ifhq53 6+cyp5 hymu51leration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 99i lz 0nlohhlrmf3)) to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|vel;jql30 ;v+iso qzvvp5uv8am4ocity}

  An object can have a varying speed if its velocity is constart/zzs31b0e4i4e j.b2 land eq6mc,k /qje 4ant.

  The velocity of an object can be negative when its acceleration is positive.x4ixm-v 2z7m vck8iw*awb8 hp) u0-xb

  If one object has a greai10 a q88orsceter speed than a second object, the first must have a great e818qras coi0er acceleration.

  Two cars emerge side by side from a tunnel. Car A is trav9c g5(eil7np-e;uto ; vi;fv keling 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)hb5 *5zjj tij its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the 0u1;hu *a(g pp*8 ot tkpfcb*hbat with a speed *p(tou 1u*0fh; hpa*k tbpgc8 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 to its acceleration, howbx / 7n/r4xycz does it change if air frictiz/c rbxx47/ynon is ignored?

  As a freely falling object speeds up, what is happening to its acceleration ..a)r8kqu 3ik dsl4zp2bi,t f, how does it change i2f ,kidur4)t.azkq3pi. bs l8f air friction CAN NOT be ignored?

  An object that is thrown vertically upward will returnq/ rn 8t2zewqj8vkj )*7fpf5m to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be a7qqf5w j8e8mtf2r) n*jz /vpkltered?

  An object can have zero velocity and nonzero acceleration at the same ti k94hfb6zzoy8c +ss0s me.

  An object can have nonzero velocity and zero acceler:d67 y:5kqwi tgxeiawq8 ;,zwvfo0p1ation at the same time.

  An elevator moving fn gu2dl3z:*c9x/k:jgnd q) ezrom the second floor to the fifth floor making no stops along the way has zero acceleration all the g3n 2zk/* qduj:) ecld9nzx g:time.

  A rolling ball moves froy(/ 2rgetpylow0ekz.n374g 9y-ejn p m $x_1=1.7 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=2.1 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundf f5fg 1u4yst li-/e.x a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.3 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its cnv m3sr n)6hvh-x7-d ph)dn (trainer in a straight line, moving 99 m away in 12.8 s. It then turns abruptly and gallops halfway back in 4.n 3x(cv-mh7)hd n nsr6p)hv-d8 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 from q. 9/nw en hr83pcj t)klg-4mb$12 \; m/s$ to $24 \; m/s$ in 5.1 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 from srnua t(r ,v61si fgrn+b,e72$21 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spe *9rskno,lrsf vx 7j m.c2;w4med of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst outc0v a78hv9is ,yl 2(rcdlaz(3asf s3m of the blocks to essentially top speed abouv 30zych3lvlcdr9sa2ai f(87a(m s s, t $10.0 \; m/s$ in the first 13.7 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 speed *r- z/uz 6evytu 4f0vgof $16 \; m/s$ to rest in 4.87 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leave 05pulsc1ie m2s skid marks 92 m long on the highway. Assuming a decelec miul05p1s e2ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$