Suppose that an object travels from one point in space to another. Make a comph9 4z ,wlq*ug./ffjq )hn9 ajjarison between the displacement and the dis.j n94h9fjfl jwhuqa ,zg/q*)tance traveled.

  When is the average velocity of an object equal to the instantaneous s- 9jb,oc;h3mjft +lzvelocity?

  A new car manufacturer advertises tl )cosr6;gze -8di j5ahat their car can go "from zero to sixty in 8 s". Tegl c5arz)do8is6j; -his is a description of

  An object moving in the +x axis j1u, t7zbquxrvg+xss- 2o89oexperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down -a+ ano(ei8w nas it approaches a traffic light. Make a statement +aiwn(a n-oe8concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down a4vuuqp:6/ w1y1c;d :7wz n;lslsr sdxs it appro;w qclvd y xzss/wr17d4u 1s;p 6nl::uaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make ag.s p; ,b;o hl39bmhrw statement concerning i 3 .h;;9lhwm bgobs,prts acceleration.

  If the velocity of an object ismgdfpukw+,6yef ,,x 4 zero, does it mean that the acceleration is zero? ,4f x+g6mu pyf,dke ,wSupport your answer with an example.

  Can an object's velocity change d ;87li4r6 wnidzeosq5nsfx6 7 irection when its acceleration is constant? Support l68; or w7s nf6id4z x5qs7ienyour answer with an example.

  Suppose that an object isnoypbt 4i -wza ;o:-f2 moving with constant acceleration. Make a statement concerning its motionz --ooip;tn2wf a :4yb with respect to time.

  Can an object have increasing speed while its acceleration is decreasiog8 pcbh7vu,h v8 * nrruvc..u29fy5c ng? Support your answer with an exampleyv58u2b gcu ,.*.rn fcv ohphcu78 9rv.

  Suppose a can, after an initial kick, moves up along a smooze vh3;*f8zv f3vzvp h.54ieshbv .0i th hill of ice. Make z*8 .pe e3.4b0 i 5hvv;3shffvzzhivva statement concerning its acceleration.

  Under what condition is av5 r syn 8m w(6;t krk+ioeot97zk:kinq -a:4dkerage velocity equal to the average of the object's initial and final velocityst5ykknmk7z: 8+ k nw-tqokra49 id6;eio(r: ?

  Objects A and B both start at rest. They both accelerate at the samhusv+g7m q0.ri vi9p)e rate. However, object A accelerates for twice the time as object B. What is the final speed of object A comp)v0igvq.s +hrmp u i97ared to that of object B?

  Objects A and B both start from rest. -rg0h :8 v) o,jsgzhwy They both accelerate at the same rate. Howev hvyho 0zg,rgw)-j:s8er, 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 released fr)(ejh) keh;hq om rest and falls in the absence of friction, which of the following is true concerning its mohh ;ee))jqh (ktion?

  When an object is released from rest and ni,qq *ch-/xh falls in the absence of friction, which of thxi ,qh h-cqn*/e following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity andkr8j4efcowqd :..rxmo1wpv2*us z,/ the ak ,/cdo: r *o1r.e. 2zxfwjq4pmuvsw 8cceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it vd;zsn x(w8cye4- 9d ar-c8dwd (v94a yzxse;n eaches its highest point?

  Suppose a ball is thrown straight up, reache2erduu ,2gy ,qgo7nx7c2k xt0s a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goinggu2yokr2 ,x nd 2g 0u,q7xet7c up.

  A ball is thrown straivq-hkt lu)5u3 ght up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the v uutk5v-qhl 3)elocity and acceleration as the ball is coming down.

  Suppose a ball is thrown1 kwcn) sd oblot2-;7p downward in the absence of air resistance. Make a statement 7tkpdn w2)os-cl;b1o concerning its acceleration.

  Suppose a skydiver jumps fro5raygp*hsl-*3 tu dg6;m ,ln wm a high-flying plane. What is her acceleration when she she reaches termim6u w grlgy 35p*l*n hs,tad;-nal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bajpz1 e;6 z9;mopd. ep6yteud7ll is thrown upward witeyodmz 6p;e6t91u .jp ;dpe7zh 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 than the first ball?)

  Ball A is dropped from the top of a builmw oc.kej81,p ding. One second later, ball B is dropped from the same building. As time progre8w.jmpk,oc 1esses, the distance between them

  Ball A is dropped from the top of a buisg mcoga0q60*rd(i 7wlding. One second later, ball B is dropped from the same building. As time progresses, the difference in thei6ro 0a*wi0qdgc(gs m7 r speeds

  Two objects are thrown from the top of a tall building.1k xy qh;,i6uq One is thrown up, and the other is thrown down, both with the same initial hqqiux , yk;61speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a buildpia(rb o k(4tmgh :fja87 n7r4ing. A second brick is thrown straight down from the same building. They are released at the same time. N 7tgjap bohrr((ak f:i7n4 8m4eglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. T0,ub: z)hmi(uwn,tvwr1 p3vv he position versus time graph v vzth)iu:mu w3,,bp (nw1 rv0of this object is

  An object is moving with constant non-zero accelew/v6l +j4j.xl 2mswfvration in the +x axis. The position versus time graph of this obfwj.m l+4lv wjs2xv /6ject is

  An object is moving with constant non-zero velocity in th 7nct7/fpjb2ee +x axis. The velocity versus time g72bcenj7 fp/ traph of this object is

  An object is moving with constant non-zero acceleration in 4k* ziy(b ixdj.zbd +1the +x axis. The velocity versus time graph of this objec1b i +xzb*dz 4jdiyk.(t is

  The slope of a position vs4gtx;ap 6sx-ersus time graph gives

  The slope of a velocity versus time gs,4k. /yyn(mp8yl sk ) 1ha9lzbli7 dbraph gives

  The area under a curve i)4ml 16jxz maln an acceleration versus time graph gives

  The area under a curve in a velocity versus dx82g cq yf8v9eo+4wm time graph gives

  If the position versus time graph of an object is a horizontal l*c t0lu wkz-+ypb6z;r ine, the object w k+l z0tb6pycu;-r*zis

  If the position versus time graph of an object is a vertical line, th p-m1bb3s d.,k ;bmhdru:)sk he object isdh;p1) b bmkr:bmh k,sus.-3d

  If the velocity versus time graph of an object is a hor-ive9 x.2gxgc izontal line, the object gx -xg2e9iv.c is

  If the velocity versus time graph of an object is a straight line making 9 )i/lcv c/d2eff9rjza 9 :hcwan angle of 30 degree2d/ 9c9 )caeicrf jz9/fhlw: vs with the time axis, the object is

  An object moves 15.0 m nortp. citm5j+0 cwh and then 11.0 m south. Find both the distance traveled and the magnitude of the disc.iwcm +ptj 05placement vector.

  A boat can move at 30 km/h in p30 u mi-uahb fp7j) xfto ;9r)j2jqo1still water. How long will it take to move 12 km upstream in a river flowingj;br0h17f 3pf-29ouqjo ip )t mux j)a 6.0 km/h?

  55 mi/h is how many clyw(n )f8h;gyma z2 7yy0j y1m/s? (1 mi = 1609 m)

  What must be your average speed in order to trfs: yo.xluwnu 3-*l 3wavel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42zes;cwcgt 1),t.ma 8kjsf0m 5.0 km) in 2 hours and 57 min. What is the average;5m)sg wjzts, m1 ctfk.e0c8a speed of the runner in m/s?

  A car travels 90 km/h. How long doeso pkjn(*nw of 1o/ex1 +b7m0rm it take for it to travel 400 km?

  A ly (light year) is the dii e1rx-ju 2i2astance that light travels in one year. The speed of ligh jxi2ra-i2u1 et 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 ab5yg5(rt4yu ld q,f.end you look to the side for 4.0 s, how far do you travel during thib ugy.lr,4q d5y5fe t(s inattentive period?

  If you run a complete loop around an outdo,6rn9kizq p)kap -1 ndor track (400 m), in 100 s, your average k1 p-6k qdzn)a,n p9rivelocity is

  A polar bear starts atofa.c,vwxch,)2 zjgq w0u;x) the North Pole. It travels 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 take;czvhu) wcjw xx2 .)go0a ,,fqs 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It tr m m6np:)ncntmy/7fl6x(/jb gavels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its nf n/6mgxcpn tlmy (m:b6)j7 /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 mil hikbmk dr0hvj37*1r ;i).elwes. It then starts ;hvi*r.h7 i mjb13wk)ker l0dto snow 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 b7n w*m s,,allevzfk 8z9ia(/ and 160 km at 100 km/h. What is the averagn7al* ,k biemfv,(s89zlaz/w e speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 ko vy9is 7qdjvdvxip:0p0 4m o2 4q-;dym/h. What is her average speed for the7m i4:qv v0jos;0 9dq-24 dvx pyopdyi trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 m1tntptuj( me(it3q( z0(pm5 j i/h north for 75j( ettq3( (iu nm0tmp j5z(tp10 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (tep .ii u2oen6u; gc(y1he person 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 oi2u(gi un;y.16cee pis 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 9 s. The car5 kvo; 2 g+egimj/w1oo's average velocity during decelerati1jmgi/vkego2+5 o; woon was 70 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 l-9yma/l.jrfta o -ah( v7p *km/s to 160 m/s, at the average rate of p 9o-h(rly-ka jmf ava/.t*l7$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratey/m nq3m l;irmx6bp73l3; z gk 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 and1d)c fo,)g6f p)sz0sswmr3-d 0 rxiy y 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 speeds up with a ck22dcxl ,y)z aonstant acceleration cyak,xlz2d2 ) 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 8zzgrkkaxp* q o4; n02o9+; yptf0phb4.8 m/s experiences a constant acceleration o;bzgz2f0xn0kk y4;8o oap+t*phr 9p qf $1.5 \; m/s^2$. What is the cart's displacement during the first 7.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 557 tyma kjoe: 6il)in 50.m/s strikes a sandbag and penetrates a distance of 89.01 cm. What is the average acceleration, in) mj0:.6iy k 5eiltaon $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cata8ie 7w* ninfa2pult on an aircraft carrier. It reaches a speed of 42 m/sfna8*iw i27ne 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 movo0,fdqn/gvgnnkn d ymq 5e6- /rq uki7*3ks,*es 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 m/s in a disqw790rbsop1n 17 jhj6(: t0grniqpegtance of 200 m. What is its average acceqgp 1hso g701 enb qr(pwt9r7jni0j6:leration?

  An object starts from rest and undergoes uniform sx0xbz351h bd acceleration. During the first second it travels 1.3 m. How far will it travel during x3zx1 5 bh0bdsthe third second?

  An object is moving in a straight line with constant accelezzz/ae.f g+d/ ration. Initially it is traveling at 16 m/s .+fg/dezz/za. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uj*q) ymglt z**niformly 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 deve6uqgz+rgp11 ,z-vbcelerate 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 that has been waitin- ihr9l-1*8kff3ep1ouwg h3mgd3nf bg at the intersection starts a3*kirnb-o1f 3lfghepguh19-83 dfw m head with 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 1 th l9;, uy04ujeluuqa speed of 12 m/s on the surface of planet X where the acceleration due to gravituhe lq y09u,ujl1; u4ty is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a sc4-ootbu;3u ypeed of 12 m/s on the surface of planet X where the acceleration due to gravito3b;yo c-u4tu y 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 sps 3u+7ofpb0 /j0yxnl n etws13eed of 15 m/s on the surface of planet X where the acceleration +7 tsn3upfo/lynwxbe1js030 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 with a speed of 14 m/s on the t6prd6w z9 wpx9 6mv2z2j1hcesurface of planet X where the acceleration due to 6v p2w9mrc j9p dht6e 26zwz1xgravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend holds a rulejzt 4b t 1r:k*1xohph; r//wupr between your fingwbp rt: /* 1xh/k41hz;rjtpou ers 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 veg8f- k., te6npduqo5n locity of 19.6 m/s. What is its velocity after 35fqn-ep6 u dgo,.8ktn .00 s?

  A bullet shot straight up returns to its starting point in 5;6--evkg; ad:ucksa 2)o;wtv xppc2 b s. What is the initial speed of twx: p ktd2; kcug;2c-6 ;ves) aa-vpbohe bullet?

  A ball is thrown straight up with 9qx30as bbc9ba speed of 36.0 m/s. How long does it take to return to its stq990s cabxbb3arting point?

  A ball is thrown downward from the top of a buildinv0jxu0:yg1q 0vazhz 6g with an initial speed of 18 m/s. It strikes the ground after 4.5 s. How h6qvj0gax zzhuv: 010 yigh is the building?

  A ball is thrown straight up with a speed+ cwy h3ylih6p: -z ;ivyhmumw1p*. 5w of 30 m/s. (only fill in numerical value in the bywm3y yi.6h*hphiupm-51w:lwz v ;+clanks)
(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 usgjbcop ;45 f0p into the air with a speed of 42.3 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 s? 98:(kaeuke( )felllp

  In Fig. below, what is huqx ; *xw--ishoffy c,kl:9 1the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t =9cuj (0n(e spb/qt 1pd 4.0 s?

  In Fig. below, what i a5o80bo ,yvfpym 1xg*s the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from ( f1qm m 6sains(u//ag0 to 4.0 s?

  In Fig. below, what is thegqh-41k k1h kjz)zs,m average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceq+6d1yn mw 1f:vifp(b leration at 1.0 s?

  In Fig. below, what is the+77e s 0 (s-jdrqwcb;oykfd w1 acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 toa486sj d8ionjzds*hdi3vf- 0 5.0 s?

  In Fig. below, what is the avewgac1jjv05;3 zo qc/ nrage acceleration from 0 to 8.0 s?

  In Fig. below, what is the d+ p ny b-3f*s/,buow st9zyxi9isplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocugzsc/ h*if /y. c,pa)ity? {speed|velocity}

  An object can have a varying speed if itss6+47 jm vgdix velocity is constant.

  The velocity of an object rjvo+k/xs.5zcan be negative when its acceleration is positive.

  If one object has a greater speed than a second objio6pta t m-x 6980/q/eh rgg2y8bscea ect, the first must have a greater a6tb 9/qse6m- ta0 p y/oarx2ie8gcgh 8cceleration.

  Two cars emerge side by side from a tunnel. Car A is travel./um+sl0va2yp; .czw5t txm xing 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 decreasesmu12ci 5dbtu g h07lr).

  A baseball player hits a foul ball straight up into the air. It le -cpw1hz:nb,j1 z y2wmaves the bat with a speec z-h2 1n1:wwjyb, pmzd 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 ivg(zi8g0o-v vs happening to its acceleration, how does it change if air friction isi z(8 ggo0-vvv ignored?

  As a freely falling object speeds up, what is happening to its accelerat6xtg nkj :m5 q.dku m;w/o(by2ion, how does it change if air friction CAN NOT xy.w kmbqo /;kuj :2n5tm6d( gbe ignored?

  An object that is thrown fp;6t byuif 67 rwetmqj1p ,ntzoy;e84e 9p5: vertically upward will return to its original position with the same speed as it had initially if air resistance in6967yfw i;bert4o mptypfu, ;z et q:p18e5js negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelerm9o 6o20 oezbo1:pwt6wg t2jjation at the same time.

  An object can have nonzero velocity and zero acceleration at the same t eyk7gsq78c-g1qu8bt1ic) epime.

  An elevator moving from the sechyd-01wz esw9 ond floor to the fifth floor making no stops along the way has zero accel 1 h0z-dweys9weration all the time.

  A rolling ball moves f83i.dc boepe1. dto2xrom $x_1=1.9 \mathrm{~cm}$ to $x_2=-8.8 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter- f znbr23bo7,oj*lbdeqr6p6 9mile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 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 strpcxm gmy v7ed15/0)bpaight line, moving 89 m away in 12.3 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its average speed y1/xmg d pvmb7)0 cpe5 (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 4a1 poe(zv(61smxf)ia,hidm8noj 9b $11 \; m/s$ to $22 \; m/s$ 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 fromdv+; kc;biotx6zv 25mp j6u1u $18 \; m/s$ to rest in a distance of 85 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacgqs:qm*x7r a ;*ylt(ka(-qvx h a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprint9qedps2ao8af7dr;zv4 7.9oe x9f bd ter can burst out of the blocks to essentially top speed about;t97d2dd 9 aboefqxzopr v4 7e9fa8.s $10.4 \; m/s$ in the first 13.9 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 unify9ncr; 5od5h eormly from a speed of $18 \; m/s$ to rest in 4.90 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 highway. Assuming l2vxbx )/vnv a:pt r;7a deceleration /txp)7x; vln:br2 v avof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$