Suppose that an object travels from one point in space to another.,81l1y1q on-y tu euxb Make a comparison between the displacement and the di-,b1txn1qulou1yy 8 estance traveled.

  When is the average velocity of an object equal to the instantaneofnrkk)xv wl54; a1+j0 78. jueivhdljus velocity?

  A new car manufacturer advertco+gk r9jrs; *ises that their car can go "from zero to sixty in 8 s". This is a description ofr j;c*o9+kgsr

  An object moving in the +x axis expe4wrui 988,kre s (qzigriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directinmwp v9/(: n4jipvi m4 5r,spkon) begins to slow down as it approachesjp i4/ ,rp5s9ivnwmvm:( k4pn a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) beginstkkv v3k.;b* mzm( go9 to slow down as it approaches a traffic light. Make a statement concerning its kk.z b m(mg;k3vtv*9o acceleration.

  Suppose that an object is m r/4sjo4a.4;fee nxjt0l :tc f:iy ss-oving with a constant velocity. Make a statement concernij./;y0ttof:seai44n 4xf re jcs -l:sng its acceleration.

  If the velocity of an object is zero,r .16s2tnu1l5 al eilb does it mean that the acceleration is zero? Support ubl r.l5n 21s1al6tei your answer with an example.

  Can an object's velocity change direction when its acceleration is cons9 kqn33jqi,:74 sc(afv 2 9bsxppbif utant? Support your a9n 9bfs,bpax 32 c7s4 iq3(:puqkfjvinswer with an example.

  Suppose that an object is mov/),edcef y m)hing with constant acceleration. Make a statement concerndm)c)y h/e ,feing its motion with respect to time.

  Can an object have increasing speed while its accelerfzl)d w.q t2amn (pk,/ation is decreasing? Support your answer with an exw lpafz,d )k2m.tq(n/ample.

  Suppose a can, after an initial kick, moves up along a smoojaktvu8e 80u3a qe8dho t8d50th hill of ice. Make a statement concerning its accele toe d508h80 dvtaauq8 e8uk3jration.

  Under what condition is average velocity equal to the avft/n/ .rw(wp yht ;nt.erage of the object's initht/..fwt ;typrn n /(wial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same ra 5xrw 24d+ivl1i *ohzxte. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to + r5xo*4 zlii1d2xhvwthat of object B?

  Objects A and B both start from rest. They both accel* n;yu i9ok.pqz3ip9pavwf t- exq101 erate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by ob1 9up *en3qyxit.qap09ow-fp1 iv; zkject A compared to that of object B?

  When an object is re(jqnhkf hh,ic6:xp5, leased from rest and falls in the absence of friction, which of the following h xjh k6,npc( 5,:fqhiis true concerning its motion?

  When an object is released from rest and fall.0z ok*b+ x ee .s1b1i5ottgahs in the absence of friction, which of the following is true concerning its o11. t i05tz*ageh ose.bx kb+motion?

  Suppose a ball is thrown straight up. Make a 5e3,x(k i 0quxvqkp4zstatement about the velocity and the acceleration when the ball reaches the highest point,qx(5 qui0ek4 p 3zvxk.

  Suppose a ball is thrown straight up. What i z-x -c,5fe k6trz7fngs its acceleration just before it reaches itsk xr7c e-z5-z 6gtnff, highest point?

  Suppose a ball is thrown straight up, reaches a maximum heighc5zqs/gs2u ml9auc90t, then falls to its initial height. Make a statement about the directi59/muzl 2qucsa0c 9sg on of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reac1pg: 8 y kko8(pmhlgr/hes a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball i 18(h8o:kgrk /pygpmls coming down.

  Suppose a ball is thrown downward in the absence 0cj14 p9cdbyl7,mfnkv(w ttt v t)d+-of air resistance. Make a statement concerning itb yndjt,vm7 wcv)4t- f0(lk9t+ cpt1d s acceleration.

  Suppose a skydiver jumps from a higm 0j lay:pi3 d/g7k a/ksx q4xn(;t2fch-flying plane. What is her acceleration when she she reaches tf7i 23lpx:k a (amns40xqg;cyk d/j/terminal velocity?

  A ball is thrown vertically upwardsn*vfpt 38)0w9l. ud4l vlwg ui:8lc a 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 ball to that of the first ball? (How many times higher doe9t*.vlplgvlnl fc8 ai)34s0u:w 8u d ws the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second laterl9sih 0i gux85, ball B is dropped from the same buhg s iil950u8xilding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second lat 0 y(6/3fu eds(ynhjrytubu :/u0dj l8er, ball B is dropped fruj jf08eur:h (by d/syun 6(l/yut 03dom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buy+mg:0 hh v3eb(fm/h cl p7d4rilding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hi+: h4(m df0h7/emcp bl3 ghyvrt the street?

  A brick is dropped from the top of a building. A second brick is thrown straightta,pno y z6i;f:k rg+7tnc+/v0yoz h/u +fa8 z down from the same building. The;vyzro,/n7nyfofu +zzt : g+kait06/c + a8phy are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The po(,xaqg4x9fyr sition vers9qr,y (xa4xfg us time graph of this object is

  An object is moving with constant non-zero accw))q)g* 7 +zztrvbfd eeleration in the +x axis. The position versus time gra d *z bgfve)qw)z+)tr7ph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The sk+yua/;lf99 mld(v6k ;kjfo q ao.-gvelocity versus time graph gy; ;lf+ (kl9asmaodjfk6 .-k 9uoqv/of this object is

  An object is moving with cop: yltf dj/ ;9dyg0m*fnstant non-zero acceleration in the +x axis. The velocity versus time m9jylyp* d/0d:ft g;fgraph of this object is

  The slope of a position versdz ,w yoxfb9/vmsp6+nf8y x*4us time graph gives

  The slope of a velocit sb. s8t.li6oqy versus time graph gives

  The area under a curve in an acceleration versus time graph r +rb. jmoi4b8wv1bxj.,qm0t gives

  The area under a curve in a veltxco s+r7c17tx+5vn 0 x6vfq wcxa8b+x; rx+ mocity versus time graph gives

  If the position versus time graph of an objectp ax-q5v+zm z0 is a horizontal line, the object i-z qvz p5mxa+0s

  If the position versus time graph of an object is a vertical line eg:vsvhq*5 w 6s)d7ug, the object isswv: d)qu geg5*6hv s7

  If the velocity versus time graph of an object is a horizontal line, the object xa;m t;o/4gqtyp1w 1si s1xp4yat;w; 1/tgqmos

  If the velocity versus time graph of an object is a straight line mykg0*,llr0 fhaking an angle of 30 degrees with the time axis, the object ishgl*l 0 r0,kfy

  An object moves 15.0 m north and then 11tp. xh t; buuja/2c3k(.0 m south. Find both the distance traveled and the magnitude of the displacement vectak3j.u;( 2 cptthx b/uor.

  A boat can move at 30 km/h in still water. How long wi7(tj)vqu zen ;2gey8ell it take to move 12 km upstream in a river floquee (eyg8vj;n) t 2z7wing 6.0 km/h?

  55 mi/h is how many m/s?kydek z se5+o-9gr q1 6g6)qkk (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 ht:. nhkm (.zxk +/hna+y ukq2g?

  A runner ran the marathon (apprsuf7ytrdj1v gejgg/ h jnt3w t,9+,4;oximately 42.0 km) in 2 hours and 57 min. What is the average speed of the ;td4ht1jrs7gj3uj, ,yw vnfggt 9+e /runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 k jv c,u1 fjry3/m)ka9om?

  A ly (light year) is the distance that light travelsc m*uha8yex/*v2wk6 u in one year. The speed of ligvmhac 6*wx/ ue8*2kyu ht 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 r 3)l il)i+ 0x2sgvwrxl*gb.ca straight road and you look to the side for 4.0 s, how far do you travel during this inattentive perio0ic rb .xig+ sw* ll2))g3rxlvd?

  If you run a complete loop around an outdoor track (400 m), in 100 rn9 9d8h0 sj 2eplj1yus, your average velocity de uy0sjh9jl28rp91 n is

  A polar bear starts a1u4ta j:pg cxe7ym( 5dt the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.u4p7e( g xamc:y5t jd10 km north, then 1.0 km west to return 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 travelspqfpy+hjtj;u g9(d h)4f2m k 7 1.0 km south, then 1.0 km east, then 1.0 km north, then f;tp4 + up(hk 2ymqhfj)j9g7d 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 ag 8vvk da-kg; gpx s8pc+.w26kgebf-* t 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 6k e-2axgk;d gcfgb- .sw*8p+pvv8kgyour hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. l7f bb u276edt.fz d*yWhat is the average speed of the motorist for 27duld ef*fty z6bb .7this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. rv:2t(wm(xs/s rd lc4 What is her averas/( s 4dwl:tm2c x(rvrge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then atp8s7et7. ws0 3bfxo zy 250 mi/h north for 750 mi s0wo7.b tf7y exps8z3les. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for g) 4ot4o3gkrs team A can run 1gos4 )g3ok4rt00 m in 9.8 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. The car's3i)o cm12nt32zjf cbq average velocity during deceleration was 44 km/h. What was the car's deceleration while slowing df) mj z23itq21cncbo3own?

  An airplane increases its speed from 100 m/s to 160 m/s, at thyxm :p( tpka9v8 ,ju-ee average rate of (akv89p ty x :-j,upme$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates i5x:lse f2 *dnat 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 restezu1ls eeyg/bsop;jfx9)3i ; 8p)v8 x and 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 withmx5ev jhbtcb40 9g g5, a constant acceleratio4h0 bxggbve,tcm5 59jn 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 4.2 m/s experiences a constant acceleration tq+.h.h h- qgv9b lke,of+lbq,h9.ge tkvh- h.q $2.6 \; m/s^2$. What is the cart's displacement during the first 9.2 s of its motion?

  A bullet moving horizontally to the right (+x direchb5evme2pb. 3tion) with a speed of 520 m/s strikes a sandbag and pe3be.p5bhv m e2netrates a distance of 69.40 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an,21gok bu76 xmt/fjsw aircraft carrier. It reaches a speed of 42 m/s at the end of the c7 j/otxks 1fwgu ,b62matapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accel ; 5,gi7nevxc +t(rjrvdy x (+z5qf:ijeration 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 808h+ukgozjj3kjf ler1 am9, 6y +wgi*d9 ;l4w s m/s in a distance of 200 m. What is its average accele ,y j1rh+;flzwusi 8ew9+dmj*j3gkl6oagk 9 4ration?

  An object starts from rest and undergoes uniform accelerg fh4iu4jm3 d)zv4 i1pation. During the first second it travelsp41)jg4f 4d hvm u3izi 1.1 m. How far will it travel during the third second?

  An object is moving in a str427tok iw-qap aight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds lawo7 a- qpti42kter it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accel6j rfksj.e/d)u2k5yie ,zsg/l) tmh3 erates 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 abo1n* yjpyx8:m1nfhmf 2ut $5.0 \; m/s^2$ 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 ( mi/k 0bfv9qc15+ eqgd-r- ,wb dhlkubeen waiting at the intersecud -l mbq-5efk d hk/cw1 ir+qgv9b(,0tion starts ahead 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 a speed of 12 m/s on the surface of4nma:jg,zd tqmmm(+c .nc .)r planet X where the acc:ma(z . g)ct q n,+.jmm4cdrmneleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwntx1hj sx ge -35ye-/oard with a speed of 12 m/s on the surface of planet X where t1j-ee/ th3-y xxsngo5he 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 s/i,qsdcu+.l/ vw edo .urface of planet X where the acceleration duu, voe+cw d/s.l/q. die 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 o cbzk3,l 6k 7xbi8ub)eum7 4odf 14 m/s on the surface of planet X where the acceleration due to gravk bix ed 7b3)u4u7ko8cl6mzb ,ity 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 yo+ivq;0v( fax gur friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catq gf( xi;0av+vch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its vh90k qe e1 sy )worg4pw:hf:1delocity after 3.0eewf4qwdhsk r hy) 10 9p1:go:0 s?

  A bullet shot straigh;+7zycy* dt; j* qoqqot up returns to its starting point in 14 s. What is the in*yqqto+7y ;o*jzd;cq itial speed of the bullet?

  A ball is thrown straight up with a sp 2(4fs .v-pwz emwkkm; yd6trf) rsl()eed of 36.0 m/s. How long does it take to return to itw6 p(l r;drev4t)wks.yskf)-(fmz 2 ms starting point?

  A ball is thrown downward from the top of a building with an initial sp:-t6j.hf(w ikpt w7ja eed of 23 m/s. It strikes the ground after 6.9 s. How high isij.k: h-jwa(wtt76fp the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericz 1b,r3:gvx qvn3:j txal value in the blx 3:vjbq, z1trx gv:3nanks)
(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 s-;dyb-b8u kvet( 8v(q-r fkp efc w7z8traight up into the air with a speed of 46.7 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is n2)4rq sb il,ithe velocity at t = 1.0 s?

  In Fig. below, what is the velofnh27 x0nqkqip k072d/5qwi vf yn+)pcity at t = 2.5 s?

  In Fig. below, what is the velocit ;grew*d+q5z qy at t = 4.0 s?

  In Fig. below, what is l,,z*x1ql gy7 oqg.;vzk: lnn the velocity at t = 5.5 s?

  In Fig. below, what ituov e2jl778eb)x .;/xc qgw umz)2x ws the average velocity from 0 to 4.0 s?

  In Fig. below, what pxwzjj8p /wcab/ 3tih2 pt/36is the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration )8 cg lak7ye(h4zcry0at 1.0 s?

  In Fig. below, what is the acce1cja1 6ye8 iiz:xok-a8x c bl2leration at 3.0 s?

  In Fig. below, what is the a4+pozefat 0h 9age r8.verage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelerati;r kg,lcmx2k t) fcg3.on from 0 to 8.0 s?

  In Fig. below, what is the dist.4lt+flb/j /nwioa- e0/ pkwplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitq (;zg( /.hnxud7e yjh9cc k+wy}

  An object can have a varying speed if its velocity is consta85e 6w,nh/krk ek qe*fnt.

  The velocity of an object can be negative when its acceleration hja4ley :m6 qic7k0;wk r9ij: is positive.

  If one object has a greater speed thldsb2(t9:a fp9( dk-fzd ;emban a second object, the first must have a grea(z f9s:p;bft2db9 d(ae -lmkdter acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling wif,z*np sj)u 9rth 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 acceleratio9efgwu:(:d31g 1m62fh+fknq nm qextn decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat u8,78;ofk9d ncdkr vfwith a speed of kf, d8f7rnu k9;vcod8$120 \; km/h$. 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, wha6*1+g2; o5wueufi g-kjfwf fkt is happening to its acceleration, how does it e;uki * 6fo fu2g1wf gfkj5+-wchange if air friction is ignored?

  As a freely falling object speeds up, wha cn4o 9gf3ewj4t is happening to its acceleration, how does it change if air friction CAgnw3o e44cfj 9N NOT be ignored?

  An object that is thrown vertically upcres5 a-f.m z1ward will return 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 alteredcz5mr-1f. aes?

  An object can have zero veloc5 )h3duuc.ldt ity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleratioh7alu r8ss* *r d*ufx/n at the same time.

  An elevator moving from the qqq,j-;zyyh70 zn s(gyda.u7second floor to the fifth floor making no stops along the way hazy.dn qyq ,qjs7(h0-;yzagu 7s zero acceleration all the time.

  A rolling ball moves from blmh ,rjx7uo6+lx+ )x $x_1=3.3 \mathrm{~cm}$ to $x_2=-7.8 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quallqof:j / 0+xz)*v lpprter-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, moving 86 m away iger :-it4(x zwn 9.1 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average speei z4( r:w-tgexd  (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 froh83t,m)zpxv n5bw64p *ma64 inm, hdi3xh rzgm $10 \; m/s$ to $23 \; m/s$ in 4.2 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 / xq5c(slmi 410hwdrv $16 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of-8je: u*up yct $28 \; m/s$ 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 bu 6d-x: *awz.cozfyv5vrst out of the blocks to essentially top speed about x6zv vzocwy. a*f5 -:d$10.6 \; m/s$ 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 uniformloh3joc 27mtzxca3e. z91) x coy from a speed of $19 \; m/s$ to rest in 4.67 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skzi- r1 lrl52mf( lh neni20ry3id marks 92 m long on the highway. Assuming nm3-e yrl 2i2rn fr(05zihl1 la deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go wmrwp/jxrtnr/ad;2 +5)c xw88zo yz9ing $25 \; m/s$ 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).    $m$