Suppose that an object travels from one point in vo oycw:(.d ne4 ws+g2space to another. Make a comparison between the displacement 4snwco.:w v o(2eyg+dand the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity?;z vq:mtj0r( k

  A new car manufacturer advertises that their car can go "from zwgkb (,dxtt8vk1oqb s(l;c (-ero to sixty in 8 s". This is a description vobxwgqks;b k(- c1ttd( 8 l(,of

  An object moving in the +x w 8je sph1f u/6u/pn3e+iyxpfn8:if-fg 99zjaxis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Esdhp/ zf hc-*8 db*4 -j pqmyxf0 wysw;t+j()past (+x direction) begins to slow down as it approaches a traffic light. Maks*pzpww j-x bsqhf -d /cp m*48t;hj+0f)(dyy e a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x dirg7 wq*pp zm(k.q r;o. x )tn0yr)gyu7mection) begins to slow down as it( gurxqp7t)mq*7oy.zgpm0k y)r w .n ; approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statememu,j)7a7lh o ent concerning its acceleration.jlu 77)ma,hoe

  If the velocity of an m tx )leja2mt /f1yr- au6*kncx5p4q;object is zero, does it mean that the acceleration is zero? Sup) u 6m1 5nxjt- 42fl/ca xa*yekr;mpqtport your answer with an example.

  Can an object's velocity change direction when its acceler) uhyi/s,v) a) tyd;vcation is constant? Supcs uty/ hvd)i;v, a))yport your answer with an example.

  Suppose that an object is moving with constant acceln5sr 9c 7ar*b )eaay/beration. Make a statement concerning its motion with respecs cb9/r 7*bea)ayar 5nt to time.

  Can an object have increasing speed while its acceleration is decreasing? Sup/ex2+bw rlihll4s9pc 877/+v hjvxt u port your4p7+x/x9j2rwl bs+cue7tvv hl/h8l i answer with an example.

  Suppose a can, after an inisseusq)ta3t/c6 43ean sca :t;m, b3j tial kick, moves up along a smooth hill of ice. Make a statement coj 3tscu :,q;sem 6 3s4a)ttnab/ ca3esncerning its acceleration.

  Under what condition is average velocityg, jbre;bdyqhtq /uv +ro*h b:z- 7b4; equal to the average of the object's in rybut ; qq7o+gbhb jhv:;zd4*/be-,ritial and final velocity?

  Objects A and B both start at rest. They both accelerate at tnkayi 9o 8fza.e, 69t;k w0otyhe same rate. However, object A accelerates for twice the time ka y;0.,n 9i6two9k z8tyfeaoas object 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 th4-:c 6di7odx)im vbhi e same rate. Howbxhm d-v:6diiio 7c )4ever, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is release ume/x ;y7bcv3+ bjpw9 49jcau,s.pyj d from rest and falls in the absence of friction, which of th7p9smj w/+xcuj4 e3,vujc9.bay p y;be following is true concerning its motion?

  When an object is released from rest and falls in the absick;l3wc2l u -ence of friction, which of the following is 2;w lck-3iulctrue concerning its motion?

  Suppose a ball is thrown straight up. Make a statem/ vymzj wny6-)ent about the velocity and the acceleration when the ball reaches the highest y /mjv)-wnz6ypoint.

  Suppose a ball is thrown straight up. h e+m.4vkuc8qa8 aaso 36:jiyWhat is its acceleration just before it reaches its highestko.c8ea ah3yiv 6+ 8mj:4qsua point?

  Suppose a ball is thrown straight up, rmia2 t4cth7(h5f5n yieaches a maximum height, then falls to its initial height. Make a styc4h5mtan2fih ti57(atement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, r:pbk f-qqfq5 x,voh0), rxmd 1eaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration m0rd q vp: 5)qoh, 1-bxqxkff,as the ball is coming down.

  Suppose a ball is thrownb8w(d0qmg -1*mrj lkb downward in the absence of air resistance. Make a statemen1(bgl m0w-k8bj *r dqmt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What;;yhc jp*j(gt is her acceleration when she she reachesph;cjtgyj ( ;* terminal velocity?

  A ball is thrown verti dwu op;io 1fa1 *1fx2t2u9-zn ddmuw9cally 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 d291;wwz*d29dtxmonui1 1uaffpuo- 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 building. One second l )-1l4cuym ydqh; oa;jater, ball B is dropped from the same building. As time progresses,) yoq;4c;mlj ua1h-yd the distance between them

  Ball A is dropped from the top of a building. One second later, xoj0f cb d9kb ,)hgf6mik) 84xball B is dropped from the same building. As )k)kf0b49jofxgd m,8icx6 bhtime progresses, the difference in their speeds

  Two objects are thrown from the to s02pvtnq7 pu/p of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are theu 2t s/n7pqpv0ir speeds when they hit the street?

  A brick is dropped from the topis txym)k +i*8 of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the+iyx*k t8 i)ms accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positionivjgpnt5867y h ql-6 u versus time graph on67p-8hg6i tu ly j5vqf this object is

  An object is moving with constant non-zero acceleration in thev-eec h , p(t2vb)t.iv* i+ycz +x axis. The position versus time grapc+ tc(2t,v y h vieebiv.*)-pzh of this object is

  An object is moving witfia4c :e q:wq4h constant non-zero velocity in the +x axis. The velocity versus time graph of qc :i4 :qefw4athis object is

  An object is moving with constant non-zero acceleration in the +x axiscg -2u12ewf(c jhqai ,. The velocity versus time graph of this object w2j1 fhguq, c (a2-ceiis

  The slope of a position versus tim-7ivqi 04owbrh s0 g2we graph gives

  The slope of a velocity versus time graph giveus dz*2agh*.p s

  The area under a curve in an accel +j +c6,ile 5 oi0/cdw7jwgyw1vtm0nz eration versus time graph gives

  The area under a curv9,j hoo9w*obwn or22ie in a velocity versus time graph gives

  If the position versu:f.iuvvrrx ( ,17-x ilfrkze1 s time graph of an object is a horizontal line, the object ivrk,vl- ur:.f( 1xi zf1erx7is

  If the position versus time graph ohgemx * 7koy/xo ubo.or ca1s7, .ro+,f an object is a vertical line, the object is+*e/omo orkcr a.x7uoo 17,.hbygs, x

  If the velocity versus nnx 1f l*v3nube r j)6h8s90hntime graph of an object is a horizontal line, the object is1r f) e98lnh0 *suhv3njx 6bnn

  If the velocity versus time graph of an object is a4ji9aw nl a,q)q+d+ nj straight line making an angle of 30 degrees , wjqnn)9il a+d+4ajqwith the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance travdw v4ex .h+ n4wm)f8sjeled and t8nm4svfd +hjwe4 ) xw.he magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to mob) :8r0yto801v,eu er hdrd alve 12 km upstream in a river flelh r80d)otu: e 81,br yvard0owing 6.0 km/h?

  55 mi/h is how many m/s? (1 miybxu1h-v767kflt 6 eh = 1609 m)

  What must be your average speed in 29a5p (vrucbiff,wee :w6jh65 vgj y+ order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What iv7aq7oi)-p x ns the average speed oo i)axv-p7n7qf the runner in m/s?

  A car travels 90 km/h. How long does it.*i5sovbaxd)d9t e: :rs u5)0ehycye take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed ck;j en17cvz5 of li1 j7 ckz5cnve;ght 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 alon8y+gmdko9kxyb az(- tak/;1 ag a straight road and you look to the side for 4.0 s, how far do you travel dutga8mk;9k(axb o y+zyd-k1 /aring this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 10l4 uab;6uyg j00 s, your average velocity iu6;y ja0blgu 4s

  A polar bear starts at the North Pole. It t 2 l9eyms/82cisj , ;hd1ikjeyravels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 mine; 2 iy1ejliydsj2/ s9 hck8m,. 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 7saw..u* je5tyo6 cclkb51jw easjaotuws w1e6 7ljc5bk5..yc * t, then 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 mile.e3nq j;2rby us. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from sc yu32qj ne.b;rhool?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the ave 7ha7n(y0smqg rn/ . xm)lzdm8rage speed of the motorist for this .78n da7mys/() nqh0mgzmrl x trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 hj(q-(dt zy* /k(w6rex16yqh qvb *czq at 100 km/h. What is her average speed for the t1z( yyj( (qq6- *khwqzv6eq *rct /xdbrip?

  An airplane travels at 300 mi/h south for 2.00 h and t) 2mv 5x5kaawi5ri y*5 yawe7khen at 250 mi/h north for 750 miles. v5k2mx w)7iaeaiawyky55*5 rWhat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 121aki ils4d d)zr6n7xx it 3-t00 m) for team A can run 100 m in 9.8 s. His rival, the anchorman fo n6sd7kila4-i ttx23 xzri)d1r 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 aea. lw87 rdddgf9w w9c74x yt,nd comes to a stop after 10 s. The car's average velocity during deceleration was 32 km/h. What was the car's deceleration whileddw g,48lwdx. te97 9cw7 rayf slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s,8;7dax 8binrqshuvi(( 5zqvl bps )( : at the average rate of s d v 5bh)p(78v:sbia;q un8 ziql(rx($15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelemp3o,n j*uy* arg8.oprates 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?

  A cart starts from rest +wigadh) sbil2xq 7 .1and 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?

  A car travels at 15 m/s for 10 s. It then spekkg e5y4dzp; vsf q6z*zz,(q/eds up with a constant acceleration ,qydv;k6/kg*p 5f(q4z sezzz 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 3.7 m/s;dtx 7d / c)k,m ybr)*jf-ketu experiences a constant acceleration of mrud)jb-*t7y)c/t e,kxf;d k $5.0 \; m/s^2$. What is the cart's displacement during the first 7.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 580 m/qmv h j:yqx2l r27d;e(s strikes a sandbag amyqv( 272h;xj delqr:nd penetrates a distance of 49.51 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an 89vhfnr- rmij-.+xhu aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s +-h.furr9mnh8jvix- . Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accelerati7tur-o2flhct 4xd9r3 / nci ;eon 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 i ofohxu0aktc6 4* uydf9p-f00n a distance of 200 m. What is its average acaotxf o k600du* cf4hu-0y9pfceleration?

  An object starts from rest and undergoes uniform acceleratia6c j.4zm q*f vb0.pwnon. During the first second it travels 3.8 m. How fv.*zp0qa4jbm wfc. n6ar will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initially9at9 ;9xoxo d-n fyx3y it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far doesxat9;x9 -o9y od3yfxn it move during this time?

  A car starts from rest ee 4numc8sqw83x jo)7 and 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 on a dry road can decelerate at avq i17y sp pv;jm.hw(so ;--(mj x7ocpbout $5.0 \; m/s^2$ 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 yna:zte2q/yoq(0.mw8l,l( o y 7xbqolight turns green, a car that has been waiting at the intersection starts ahead with a8xqbqn. my(y0 aootw/y(e,ol zql27: 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 spee,yrctjq + ah/b8pct(9d of 12 m/s on the surface of planet X where thehbjp crtct,9/8q + (ya acceleration due to gravity 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 the surface of planet X whef rkees4cs(1-qu+,muy8 gxrlb:j, u4 re the acceleration due to gravi4e8frb q (c+klmrs euu,,u4s-:x1yg jty 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 oc k 5e m9*6x4t;vl9qejuy 6bvhf 15 m/s on the surface of planet X where the accelera 9mt6hje4v*u5e; ykv6q blx 9ction due 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 wig j2t5( md8dea)-laeku e2ca9th a speed of 14 m/s on the surface of planet X where the acceleration due to gravity it9 acd82(eg25akjul )ed -mae s $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend hosa,;6m,63q(sr yi c,ww l ivuxlds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before ycrquyimvl,x,,a63 wws6( s; iou catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. W) )( o1grwne fp/v)jkxhat is its velocity after 3.))/gxr po v(f1k)nejw00 s?

  A bullet shot straight up returns (e/ea ec.;l sk0c5tlvto its starting point in 13 s. What is the initial speed of the bul tee; s0/5cev (.alklclet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take t ) rmasdfoq,bp+m63u(h 8:hvto return to its starting p +h hsq)m,t8pm(bf ro6dva :3uoint?

  A ball is thrown downward from the top of a building with an initial speed of u93sg3j 3z1 kgkpl pg521 m/s. It strikes the ground after 4.7 s. How high is the buildi3szkl93gu5pk3 jggp1 ng?

  A ball is thrown straight up with a speetq- xubku 1:pbj- j+w6d of 30 m/s. (only fill in numerical value in 6+1 bk uwpjjtqxb- :u-the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit sts wlo32r5xs8 f7 jcj7uraight up into the air with a speed of 43.5 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 1 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 velocity9biozs(. lt(n at t = 1.0 s?

  In Fig. below, what is the vux kln9y 63*xqocyd45elocity at t = 2.5 s?

  In Fig. below, what is the velocity at t bn zh1 qd.ifu9f ;(yi6= 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 9-ldg:bmzdor5:pdf 5 s?

  In Fig. below, what is the average velocicl /oih.,-mz ity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.dfsw*ey *o9gn)cgf9 g3/ 7e ej7 sjs,o0 s?

  In Fig. below, what is the acceleration atjv.*rl)0 adl skx io r9d.df18 1.0 s?

  In Fig. below, what is thet*cb+vld6 q;g acceleration at 3.0 s?

  In Fig. below, what is the average acceleration f 5*)epe5uvf(lzw7n zc rom 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to f42 ls8mkj31t4ferz s/ hm-hg 8.0 s?

  In Fig. below, what is5qtjk-u tw +g8 the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitef9-3mn k+ *lxggpd x,y}

  An object can have a var8x wvlo:kj ckr,84g 6rying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration isy l:rm8r6*q .r3rpvxm positive.

  If one object has a greater :hfzcw98s.m ;ho/ dp xspeed than a second object, the first must have a greater accelerp 9wf.;c dxm oh/8s:zhation.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed ofa6s otk6;zwakkb+ 2/f $60 \; km/h$ 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 itsy +ufs3bku)n 8(9qdrah 4 uy)y acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It lc.l (r p3vo:.;swi6w walyvj9eaves the bat with a speed ofi:oylw9(j36a .wlspc ;.v vrw $120 \; km/h$. 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 speeiva i42n:t5 kshjka( /ds up, what is happening to its acceleration, how doei45 a2kj(/stn ivhk:as it change if air friction is ignored?

  As a freely falling object speeds uq.p,a ;z7mte ap, what is happening to its acceleration, how does it change if air frzaq7.m,;tpa eiction CAN NOT be ignored?

  An object that is thrownjg:s- cw q 5.5gkihlj7 vertically upward will return to its original position wi7q js5gkh:wlicg .j- 5th the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velowz rhmz:)+z*aemb -hwvh(ck57 b7+uvw r 9wu -city and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero qwo*sm5d7) ffacceleration at the same time.

  An elevator moving from the second floor to the fifth floor ma:ornez6j0zj6* r v0vbking no stops along b6ovez:nv*jrzj 006r the way has zero acceleration all the time.

  A rolling ball moves fro5( tm;nu:t1-qif xnrxm $x_1=3.2 \mathrm{~cm}$ to $x_2=-4.7 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ 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 $t_1=-4.2 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarbj) : t0z;nnodop mkzp6:8te -ter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.3 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 kmrcmi-8,u,8jv z jl-line, moving 116 m away in 12.1 s. It then turns abruptly and gallops halfw, ju l8rvm,km zji8c--ay 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 fromd,fp1)yhjr) xr p*-fm $12 \; m/s$ to $23 \; m/s$ in 4.7 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 voy*pu lb, n9bn+8 h4b$21 \; m/s$ to rest in a distance of 66 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach r4.a jcp6/t)(sgq0 tf9enqu ia speed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speedqyd+99 4ce2m qg fef/4,s5evu szdf7e about e eyz/ s+f45mfd9q4usqe,f ced72v g9$10.2 \; m/s$ in the first 10.5 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 uniford :5kuu z9yl wwr(h.:nmly from a speed of $20 \; m/s$ to rest in 4.73 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the higyn,3 zfptkf 5zx k3 :8)oxqdr4hway. Assuming a d ozx:53,zy 4q 8fr3df)nkktp xeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$