Suppose that an object travels fro2+;ab5:cdkaxv bc.q m m one point in space to another. Make a comparison betwee .d:mavbq+a2bcx 5k;cn the displacement and the distance traveled.

  When is the average velocin+c -zqhcpu jgp-fc.blo) 9-y3m1qp*ty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that tjs24 rud9:up) tdk/lkheir car can go "from zero to sixty in 8 s". Thku)u 9pkt: 2ddr/4ljsis is a description of

  An object moving in the +x axis experiences an acceleration of.2ci62;3lc7t v2 kxelr ag snc $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelinv .wwl1b y kxt:y8.rc(g to the East (+x direction) begins to slow down as it approaches a traffic light. Make a stybw.yclwt r1k8v:x.(atement concerning its acceleration.

  Suppose that a car traveling to4u3 6bu ;nt3hr8srecx the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accel3u3t4r x; 6e8csnrhbueration.

  Suppose that an object is moving with a constant velocity. Make a stazsxh ;,vcqm x1 *m4ak*tement concerning iax*1 zmq ,v mkxc*sh4;ts acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zgkkntfi)3d l- 68; ktgero? Support your answer with kgg8 6kt3;flk -n)tid an example.

  Can an object's velocity change direction whe1rb8 -ifv+e mpr8lum ,n its acceleration is constant? Support your -blvfimu +mr,e8p81r answer with an example.

  Suppose that an object is moving wik6uar/cn ng,r 595 ecxth constant acceleration. Make a statement concerning its motion with respect to ti5/rgcrnu5 ex, 9a 6nckme.

  Can an object have increasing speed wh;t7gsh2p )fznu ca;/ gxc4b g0ile its acceleration is decreasing? Support your answer with2cp;) uz/chg0tg4bngx7a ; fs an example.

  Suppose a can, after an initial kick, moves up along a smooth hidm. sf/e19+tfpx w/l(v 0vnbwll of ice. Make a statement concernb p +x0nwdm9 f/tw(./vfesv l1ing its acceleration.

  Under what condition is average velocity eq ac7kk pj+0lv5se7 +dbual to the average of the object's inik+v7c5ja sd kbl+ep07tial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same ra0wbh/ u4 a/mixte. However, object A accelerates for twice the time as objectwh0x4mab/ / iu B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They i*3.3mebnvb n 9gvbg) both accelerate at the same rate. However, object A accelerates for twice the time as object B. What iv.be3gbni m gbnv9)3*s the distance traveled by object A compared to that of object B?

  When an object is released from resy08c /v3( r weqnfodh+t and falls in the absence of friction, which of the following is tr vw3+qhde cyro/80fn(ue concerning its motion?

  When an object is released from rest and falls in the absence of friction, whib2xe8qjsa x0.ch oe.x bjx s0a2q8f the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocitfm 1xpgsdm)vk31*9 bc6te(a s y and the accfbk)psg 6ma3md csv1( *19exteleration when the ball reaches the highest point.

  Suppose a ball is thrown straight+jxo0v9 0dp;nj3;a to epmc e; up. What is its acceleration just before it reaches its higheopm0p j3 +ceetv9x j 0a;;dn;ost point?

  Suppose a ball is thrown straight up, reaches a maximej qd-k5v;: grum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goiejqk5: ;drv-gng up.

  A ball is thrown straight up, reaches a maximum hek grfw;z:vesw : 5.,tkight, then falls to its initial height. Make a statement about the direction of the velocity and acceleratio,fe vz;:.w:k g5tksw rn as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air re1mt2 llki3; pqsistance. Make a statement concerning its a1 3ptklqlim2;cceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratic:l(x( i bg(hgon when she she reaches terminal( g ic(bg:hxl( velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball-2d5cy r+dwiam5 kx9aeg/d4t 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 secg +taa5wmi-d9y/dxke42 rc5d ond ball go than the first ball?)

  Ball A is dropped from the top of a building. One sllef:ra 2q;7g;g gms9 ko/5psecond later, ball B is dropped from the same building. As time progresses, the distanc:qrpa;sgmk/olf2lg 7 ;ges59e between them

  Ball A is dropped from the top of a building. One second later, ball B i;l,v soqfvrw k+s wou7 fue8;tf1+ +5ys dropped from the same building. As time progresses, the dif re tul;wkw7f+o 8f;y5 +vs+osfu,vq 1ference in their speeds

  Two objects are thrown from the top of a tall building. One9kp )ioyzbhxzg* /08s is thrown up, and the other is thrown down, both with the sasz b)kx z80gio h/9y*pme initial speed. What are their speeds when they hit the street?

  A brick is dropped from the tre73:r*xsyd jop of a building. A second brick is thrown straight down from the same building. They are released at the same ti*xrd :sjre7y3me. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant no1bx mnts0 f.i-n-zero velocity in the +x axis. The position versus time graph of- .bsfn imx0t1 this object is

  An object is moving with constant non-zero accelerati.yj1fop4p a g;on in the +x axis. The position versus time grg.14 jppafo;y aph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The veluxqc d:1mw;khz +2bo2ocity versus time graph of this objecz+ x wdm 1:2hb;ku2oqct is

  An object is moving with constant non-zero acceleration in the +x axis. The z on+ 5fn3 ae4ehqz1eut.)f7hvelocity versus time graph of this object iq 5ezu )ea 3enzh4nh1.tf f+7os

  The slope of a position versus time graph gi 6stvt je,hg tu9.mv/)tc48obves

  The slope of a velocity versus timh(5g9k.bqycpajmuk--b p nu*63y.wke graph gives

  The area under a curve in an a4lwm306v, o2sn wvg hzm.nh -zz4p2gwcceleration versus time graph gives

  The area under a curve in a vel9+3+3hg1ysr r d phwtqocity versus time graph gives

  If the position versus tiu f5v8f-0ix:kd-x qbn me graph of an object is a horizontal line, the object is-8i5xun k-q xfvdf0 :b

  If the position versus time graph of a)wyn6b5iv( e8dd moj 1n object is a vertical line, the object is wmid15)b 8(v6ynjed o

  If the velocity versus timyji z4h01n0gj+ grj2o. kah g8e graph of an object is a horizontal line, the object y o2g8n k zj+jhga.40i0gr1hjis

  If the velocity versus tpha(3fxd8ob h4v4v f y70tze6ime graph of an object is a straight line making an angle ofhf6dxh43 tz a7 fo8p(vb4yev 0 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.d)+a9gg8,xkwsydsm-3 b hk/0dd bn: l0 m south. Find both the distance traveled and the magnitude of the displacemen)n mh-kdd g ax0/+8y,gb9s:3bwdklsdt vector.

  A boat can move at 30 km/h in still water. How long will it take to move -lgbyc zfq za*4i)h36 12 km upstream in a river flowing 6.0 km/h6)yql ib 4hcz-gz*af 3?

  55 mi/h is how many m/s? (1 mizr m+(kho )/8p/ f op;bmm+orw = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 ou(l5vv6,oni2mp+b w h?

  A runner ran the marathon (approximately 42.0 km)j.c iy9/kg2ic;lcsdulj/ n 61jujn ,7 in 2 hours and 57 min. What is the average speed of the runners c9lnj2 u 7u6jj//1n;kldg,j. iiccy in m/s?

  A car travels 90 km/h. How long does it take for it wxtcj+ 9xa)*vgpp:jb h.y,w: to travel 400 km?

  A ly (light year) is the distance that light ia)i-7 gtx26hrr);(:;thm cbpno olvtravels in one year. The speed of light iirtl-ng h7( c;oo) bi6m:2)xat;p h vrs $3.00 \times 10^8 \; m/s$. 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 straigpp;dk,ll/2w2rp1 asmht road and you look to the side for 4.0pl ;d2m1lr2 /pask ,wp s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avuulyf) 89d*4n r gb9 a)slw)n2nqwd q.erageu4q*flralwn gdu) nn)9)82y bd.q s9 w velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, tu /8jh(v i7vdvhen 1.0 km east, 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 aver7h/udvv(v8 j iage speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1,caf7 c s ffss/e+4vl5.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the beaf css e,f74/fvl+cs 5ar's average velocity?

  You are driving home/h kju8n+a io9 k5r)s5x/h/ r6eezzx j on a weekend from school 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 far is your hometown from schoo/e6 rezx u/krz j5x8hj5hk +o/n)9sial?

  A motorist travels 160 km at e nc(88m*z7cyqxlez*)hr /ch 80 km/h and 160 km at 100 km/h. What is the averageqh7r/z)x*mhclz e c 8*8y(nec speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What ik0lnmtwmm w3 vk0( +/ks her average spee00 mk/+v( wwmm3klntkd for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north foq 3.le*ckc z 9nbvms2.ll *hd0r 750 miles. What is the average speed for the tri.qsvc d* 2n bemll kh*l.30c9zp?

  In a 400-m relay race the ancxqlho .xril*g.o 0-d9horman (the person who runs the last 100 m) for team A can run 100 m in 9.8-orxig. hql ol*0. 9xd s. His rival, 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?

  A car decelerates uniformly and comes to a stop after 10 s. Tld9koi*20o c qhe car's average velocity during deceleration was 36 km/h. What was the car's deceler o0dio2cq9k *lation while slowing down?

  An airplane increasero -fd-+(byf +v6ngk js its speed from 100 m/s to 160 m/s, at the average rate of b( ff6n+okd+jyvg -- r$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate ymj1bf 1t)bw-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 a-,y4swc)gefrj hx /0u nd 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/ be1wjco 9/;gjs for 10 s. It then speeds up with a constant acceleration ; jgjc/ oew9b1of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial d+.1 (kpupep-i vfnd5.k 0e js an5fe/velocity of 3.1 m/s experiences a constant acceleration of 0ee5v d.nppdk(s+ffp a-5e i/u1.kjn $4.7 \; m/s^2$. What is the cart's displacement during the first 5.5 s of its motion?

  A bullet moving horizontally to thz/pcy+ub2*gg w 1c)jb4bvja4 e right (+x direction) with a speed of 532 m/s strikes a sandbag and penetratac 4*2b jygv4cbj+ bpw1)z /gues a distance of 20.62 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched 2,l k-o8tuv /wv7p4 hp(lnoxyig* jf,from a 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. Assuming the acceleration is constant, what is ,t *h 84p,/ 7yvvkwjpo (g2xu flonli-the length of the catapult?

  A car starting from rest moves with constant accelerationl+iv2tp( r 8cv 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 distance oodcxy pj24g4cri h0 10f 200 m. What is its average accelerati y 00chpocgx12d j4r4ion?

  An object starts from rest and undergoes uniform accelera)-to9 i r(ln,a7vc kpgtion. During the first second it travel,t 9-ni7r p(ca okgvl)s 2.7 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initialkj v8vi c()b1tly it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move d)cvkvt1 bj(8 iuring this time?

  A car starts from reua ,jbyvd7+c0: c4dcw st 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 abox907wit/d51jhi c lj3p* liifut $5.0 \; m/s^2$ 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 trafficr7 , bo np uwlg04:q;0yzlic4r light turns green, a car that has been waiting at the intersection starts ahead with a consinlz;0 l wb,oprrc47:g 4q 0uytant 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 sdof)ly d-q8c9peed of 12 m/s on the surface of planet X where the acceleration due to q)doc df89 yl-gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward witwxyu w4 3th:j5h a speed of 12 m/s on the surface of planet X where the acceleration duex:h4w5 tu w3jy 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 pq lz9j7p*gqgmvr*h4r:s z+f1lanet X where the+9sg *rfqhvljmz4 71q gp:rz* 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?

  An object is thrown upward wu,1p c+ ecx 8i:uh/oafith a speed of 14 m/s on the surface of planet X where tac:p/u8 efhoxc+ 1,i uhe 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 grnx37.dw x w1vueater than 0.10 s. If your friend holds a ruler between your fin7dx u w.wv13nxgers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a vr*wuw6fbqixrkr l50,/s: d f-elocity of 19.6 m/s. What is its velocity after 3.0wi, /5urfb*ws dk: lf qr0xr-60 s?

  A bullet shot straign olc ndy08rjr4j ;)(-maperx/,xc,i ht up returns to its starting point in 12 s. What is the in x-l0dap);i /ecn,n jjor,yc8xr 4mr( itial speed of the bullet?

  A ball is thrown straight up w v)279 zkgyda j1m1viiith a speed of 36.0 m/s. How long does it take to return to its starti)v9 d1mag7iik2vy 1j zng point?

  A ball is thrown downward from the top of a build ddw0q /hqn2; 4u;zd*mj3ns 4w*kyxs7 8sfnlq ing with an initial speed of 25 m/s. It strikes the nxdl7kq;;yjw ss *s02z dmwnn4/d fq8*q uh 43ground after 2.6 s. How high is the building?

  A ball is thrown strj5 6 4ure(ngt+4t c+qcdeee4jaight up with a speed of 30 m/s. (only fill in numerical valt5+4g6ede4te ( ccju +jqrn e4ue in 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 straight up inwzmvq7i/ mc( )q.pw f3to the air with a speed of 49.6 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 velocitr272ri npkq2ey at t = 1.0 s?

  In Fig. below, what is the vzqya/k* jn );h 3zwjs.elocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s?k9g2:sgb(xibti 7g t7

  In Fig. below, what is the velocity at t =aflm5(v3mj(ddu- d-:+bn qam 5.5 s?

  In Fig. below, what iskeuebe ,)auiyw1 .(z; the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average t7k.l8z2yma6 -x;fyd;mv fbovelocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at0)35qjqi9:l nu7 galhep-bw5je; b la 1.0 s?

  In Fig. below, what is the j:8an9 z biyn jhgg+5-acceleration at 3.0 s?

  In Fig. below, what is the average acceleratio9fxwny ;6 7rlntdg.:t n from 0 to 5.0 s?

  In Fig. below, what is the average p+c7s,*vhw 3gw/ +6zoh ubkwk acceleration from 0 to 8.0 s?

  In Fig. below, what is the displa:wnjzy q4.bn/d ,uv(f ylam-)cement from 0 to 8.0 s?

Does a car speedometer:c 8t.kcfvc+( utv;a4 el4vre measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity8-vu d,4iefb a is constant.

  The velocity of an object can be negative when its acceleration is positive.j12 y/tcxg4g ve5h)pm

  If one object has a greater speed than a second ob* -uifr9l*f 0 :3td00 vovuqh)qzwlkvject, the first must have a greater accelerokfv*)9lr30w u 0tv *iz d:uq-f0lhv qation.

  Two cars emerge side by side from a tunnel. Car A is traveling wiuwd f),.5.nfjxve39zb0wt( 8c qrf e wth 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 z)8jout3 md*bom e61 s-njm2udecreases.

  A baseball player hits a foul ball strsqcr /jy,g t ;0k5 s;dbjrvz4bz.2a :paight up into the air. It leaves the bat wyt5 20/ ;rkcgarbz,pq svjjs b;:zd4.ith 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 objece,feda y1ir0.t speeds up, what is happening to its acceleration, how does it change if air frictiirad ,eyf.0e 1on is ignored?

  As a freely falling object speeds up, what is happening to its accelerationu(3y,qnbk l)d8qgc xzj(4 i h*eas,6a, how does it change if air friction CAN NOT y(nad 6e3,(xqhcu,jlaz g4sikbq) *8 be ignored?

  An object that is thrown vertically upward will return to its original position lpabw46icm1 97m4 f ,fcw (wstwith the same speed as it had initially if air resistance is negligible. If air resistance is appreciable,a 4wm4b s 67cmlcf(tiwf9,p1w how will this result be altered?

  An object can have zero velocity and nonzero acceler4)ibg *+ (jevme0 z7kh atd/y abwfi8 h0tme*+ation at the same time.

  An object can have nonzero velocity and zero acceleratcbvv z,uksc8qg(s+ x2tw5 ::x ion at the same time.

  An elevator moving from the second floor th;m2t * wvepcdw(py,7 o the fifth floor making no stops along the way has zero acpw*p c7dte;2vhym(,w celeration all the time.

  A rolling ball moves fro vc2 *ka te*cm l6ravik+a5*7wm $x_1=2.1 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.4 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completl d 3t0s2wy2r0*nt dple laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.4 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 114 m away nnk sxq ,lh+--in 10.9 s. Iq-k l,x-nsnh +t then turns abruptly and gallops 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 fr b wuof ape5(2r15;xetom $12 \; m/s$ to $23 \; m/s$ in 5.9 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 frovn( i7qc )ab(2ziib 4vm $17 \; m/s$ to rest in a distance of 76 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reago:mmx9-qmfw 4jv/;j9a d r q,ch a speed of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially toput s*9v 3 i7tm6vza2uu speed aboutuzms6uv7ui3t2 v a *t9 $10.8 \; m/s$ in the first 12.5 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 uniform 7gxz i5ls88uqly from a speed of $15 \; m/s$ to rest in 4.91 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car 8e3g .38jqyoet *b1iqdu li7c6hr:+ mq q y2vnleaves skid marks 92 m long on the highway. Assuming a deceleratioy:d1.icmh2 q7n3 j +q u g8it ylqe8rov*qe36bn of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$