Suppose that an object travels from on slu,h(o0 x )c:k82k+f + ltnpylrt2nke point in space to another. Make a comparison between the displacement and the distslko k+ tly)2n2cf8k+r(huxn t0pl:,ance traveled.

  When is the average velocity of an obje2qn e4lz93bepg (cdl ,ct equal to the instantaneous velocity?

  A new car manufacturer advertises that their car c )zz9d0oirvh+ an go "from zero to sixty in 8 s". This is a descd) ohi 09zv+rzription of

  An object moving in the +x axis experiences an accelerazcp j4/ (e d9c3dre;zj.jgz(rtion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins rwtwv/y f ;1febxw46: to slow down as it approacheswer1v/f;b:txy 4ww6f a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) */lvnvgv+q,a5f wt-g begins to slow down as it appqwvvg-,a5t f g+nv* /lroaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving a5py-6lkf;gkrese +ti4mp ( fkux8(8 with a constant velocity. Make a statement concerning itskf5x u rp kptmefgse(8;y46i(al+ 8k- acceleration.

  If the velocity of an object is zero, does it mean thekdah3 9:/ uxfat the acceleration is zero? Support your answere 93adk/h fxu: with an example.

  Can an object's velocity change direction when its .vok y 7qc1rvgbv.2q 2acceleration is constant? Support your an1.2.2 cqkb7vqgvy rovswer with an example.

  Suppose that an objecf0t4iet, o*)w6h (qpd; le jtv)ttmg) t is moving with constant acceleration. Make a statement conc g6 )t0o4flqt eptv;)(miteht *d w),jerning its motion with respect to time.

  Can an object have increasing speed while itsvf +4da4ass3o:f) ij0 i vxh/a acceleration is decreasing? Support your answer with an 44v)f30vxjdi i so + /ahaaf:sexample.

  Suppose a can, after an initial wtop5 do*nu,rhak,;jto) r6, kick, moves up along a smooth hill of ice. Make a statement concerning its acceler hao,6p,)n*tw,o5jk ;troudration.

  Under what condition is average velocity equal to the +hhy psm6v5/j average of the object's initial and final velocit /ysv5m6hjp+h y?

  Objects A and B both start at rest. They both accz8.xy+, ak ibcelerate at the same rate. However, object A acci+zy8xbk.ac ,elerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both starthob53 t n70;k ylj.ygh from rest. They both accelerate at the same rate. Howo .07nb5gyjhly;h3kt ever, 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- us- mke6ge2n from rest and falls in the absence of friction, which of the following is true conseu6n - -2kemgcerning its motion?

  When an object is released from rest and falls in the absence of frictionb .*3atpu j/yrq lwq)/, which of the following is true concerning its mowl/) ruj3qq y *at./pbtion?

  Suppose a ball is thrown straight up. Mak1p)fsem.5 juwg-*0 g.opsz fpe a statement about the velocity and the acceleration when the ball rea.f0)pjz pow e-1g.f sus* pg5mches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration justo+*j 9,rnw;rcu hqn(f before it reache,+jou* nch( w 9rnr;qfs its highest point?

  Suppose a ball is thrown strasr)s*15m qsg oc4tvnu edk-;:ight up, reaches a maximum height, then falls to its initial height. Make a statement aboutosm*e1q4sstcr;vkn- 5 ):gd u the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reacp7afv2yuve6:.a f4n dhes a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is co eafup7 a2fdnv6 .y:v4ming down.

  Suppose a ball is thrown downward in the absence of air k9,c;6) tjyr*tqj tqr resistance. Make a statemek*qy tj,rtq6cr9j;)tnt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Whaac nl-xw (w2nm)/vao /t is her acceleration when she she reaches terminal )a vmw lwn //a-nc2x(ovelocity?

  A ball is thrown vertically upward with a speed v. An :pfrqthnzsv6b/)x z;p z5d8,identical second ball is thrown uq np x:zpz8d/5tz;rfsv)b6h,pward 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 second ball go than the first ball?)

  Ball A is dropped from le;la fy 5zs x7,0gam.the top of a building. One second later, ball B is dropped from the sama, xylmga57.; es0fl ze building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. Oned4r1il4a x*.qki yh x/ second later, ball B is dropped from the same building. As time progresses, the differx1xq hl.r4iak4 i/dy*ence in their speeds

  Two objects are thrown from the top of a tall building. One is thro1s/5aqy bpwt;i- 7,ykqxtzb8wn up, and the other is thrown down, bothbt;xq wy7qy1 -bas5t/p8 k i,z with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A sng*j+sgr b ez-9; tyrat0g+w,econd brick is thrown straight down from the same building. They are releasedw0;sa -ygbz,r + +jtt9gg nr*e at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant mf4w,) pr6idpqeo:1 m non-zero velocity in the +x axis. The position ve)m:fpq dm1i pwr o,e46rsus time graph of this object is

  An object is moving with constant non-zero a8m7v8o2ws v n:xzuj8mcceleration in the +x axis. The position versus time gr8x v7vnmswu:8o z8mj2aph of this object is

  An object is moving with constant non-zero vz+j rtzwkn5a2;w rw*9elocity in the +x axis. The velocity 2r;9zjz5+w*n w rtwak versus time graph of this object is

  An object is moving 3b8; orquaz6 rwith constant non-zero acceleration in the +x axis. The velocity versus time graph of th83uaz6;r br qois object is

  The slope of a position s e* )o0qio;ncversus time graph gives

  The slope of a velocityw;j5l zl as*s9 versus time graph gives

  The area under a curve in an-t(ztonv51 jh acceleration versus time graph gives

  The area under a curve in a velocity versus(y:s g :afrut2 time graph gives

  If the position versus time graph of an object is a i u ) d/ tg26.mjd4ynrz-wy9bwhorizontal line, the object mugb 6z n/29ywdijdw )4t.r-yis

  If the position versus time graph of an object is a vertical pl0 7e2fn +e13o9o8nzswr feinf* )jo line, the object is)8o 3of* nfn2z +e0eip ern sj9lw71of

  If the velocity versus time graph w+fx6zz m cnu5yrg -:*of an object is a horizontal line, the object r+wu ynz :g-mxz56cf* is

  If the velocity versus time graph of an o(bfi6)uwttx2-48efgdp , xx cbject is a straight line making an angle of 30 degref)td(-x6wpb2 xu f , t48xcgiees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance tra89l 0u v;fq+4l lidsycveul+ dli08 ; 4l9cqsyfvled and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. H hg2co qj0jpmu )v qe f-ry)*/.r;2xfvow long will it take to move 12 km upstream in a river flowing 6.0 j0pv2e2 urgr* j)fh/ y)v ;fmqx-co.qkm/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)rr +k0xgcn-; 8lfc 6kp

  What must be your average speed1yt*has3p 4/qo lde p( in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min(t9di9c*ryii tuv2 o7. What is the average speed of theu 7y9t( ivr2*i9iodtc runner in m/s?

  A car travels 90 km/h. How long does it take for it to traf ,. bj.(e q.h)xlltcbvel 400 km?

  A ly (light year) is the distanc:eba sq e9r(3ue that light travels in one year. The speed of light qre:a (3s9b euis $3.00 \times 10^8 \; m/s$. 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 look to the sip dum 42)ho do0i12iwlde for 4.0 s, how far do you travel during this inattent4h 0ou1 o)ipidwlmd2 2ive period?

  If you run a complete loopijxq7q ew9j)zc w:cjdn0c:nq+9q 9e) around an outdoor track (400 m), in 100 s, your average velocity is9 ncx ewcwq0))e79qincj+ jd9z j q::q

  A polar bear starts at the North Pole. It l a,e9.3nvupvtravels 1.0 km south, then 1.0 km east, then 1.0 km north, u,3 9nvaplv e.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 Plcs -q gzq77r +d( +n1e8ynejjole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return qq8r+nl7dy 1c+7j z jesg(en-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 11fn2qb t 0vu2 /r0huyz7z ee,-p0 miles. It then starts to snow and you 0e02qunut/z-fz 2ve7br ph,y 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 16ajc(e zpm)5vxuj 2 7c70 km at 80 km/h and 160 km at 100 km/h. What is the averagejc2vj5 ) ue z7cx(pa7m speed of the motorist for this trip?

  A motorist travels for 3.0 h dj vd 4l hf(2y24zbnu8at 80 km/h and 2.0 h at 100 km/h. What is her average sh4nu2jf8b4l z(dv d2ypeed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fokm xt buj2aqk4t: 1 o5n4f-t5a6;gvnvr 750 miles. Whatm41vb5o tutk625n-xn aj;f: 4kaq t gv is the average speed for the trip?

  In a 400-m relay race the anchorman (the kzl7ik iw,5g*kw j*of 1/kh8x 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 8 k7i fkg,*w k1lzhkojw/ix*510.1 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 uniforv 5wva2 jz+el2jm7zg4+m*k kmmly and comes to a stop after 9 s. The car's average velocity during deceleration was 64 km/h. What was 25z+l*evv m gamzwkk7 4jjm 2+the car's deceleration while slowing down?

  An airplane increases so)s vwnurp* 21 kc1uifv1y27its speed from 100 m/s to 160 m/s, at the average rate of cwp 1iu ks1 n*uo7 fvy22rsv)1$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at )c(/ny ltv*fo 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 apyutgr 2pm5df31( f(3oxmlz9 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/s for 10 s. It then speeds up with a 84 r/h zcj*owwconstant acceleration ohoc8jrw 4/wz*f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.8 m/s experiences a consdjoxf:r2zj:j9 uq) 6o)f qw 7ytant acceleration oy)2 qwfj x ru:7j qo6o9jd):fzf $3.2 \; m/s^2$. What is the cart's displacement during the first 9.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 281 m//v 3hi;rvcvogdhm6g( l /s,z *s strikes a sandbag and ghvdmr/i6,( lvsc;/vg* hz 3o penetrates a distance of 75.92 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from8ri 8 sjzv+w-p2q7 pql 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, whq ips+lj 8p8-w72qr vzat is the length of the catapult?

  A car starting from rest moves with constant an)6t yjxs18z*; nuze occeleration 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 of 200 m. What is its a)i)v6ts7 5b tnp fgao8verage accelerat bv na)7t tpsifo6g)85ion?

  An object starts from rest and unxo 02p5llpn99ukw p+q2 c 1iyedergoes uniform acceleration. During the first second it travels 6.9 m. How far will it travel during the third secon+ieowy902l kpu95 lxpc2q p1nd?

  An object is moving in a straight line with constant acceleration. Initially it 6k(h6w*bwzg b is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during hwwgb *bkz6(6 this time?

  A car starts from rez2k8ci7kk6acq dm 3+dst 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 )r +i 1j pcwhn3m8eap.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 beezs7fwkr4 0 3rt0fv+):nr opfsm 4)daan waiting at the intersection starts ahead with a constant accntsm0k 0pa:arf)4osf w+3d7 z )rv4rfeleration 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 vy kbkj( -.z6fwloqwg3-r4 .pof planet X where the accele4y vb-.lk j pqw3gforw-(k6 z.ration 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 surfrwp6eb .s- 6tvace of planet X where the acceleration due to gr.tw bve-rs6 6pavity 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 ,7nd-pmj ox2lgz 19qu of 15 m/s on the surface of planet X where the acceleration due to gr2, 9 p lzxnj-q1udogm7avity 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 dhz0 2y mk/a4,f b3fzs9nsi2dplanet X where the acceleration due to gravity is i9fh 22ms0b3 zyfdds,n z4/ka$3.5 \; m/s^2$. 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 rulel oxxkg3, 1ka:: o,kalxgk3x 1r between your fingers 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 velocity of 1qvrow:2 -kutp2 -v3sp9.6 m/s. What is its velocity after 3.03:v-2v prt pwo-u q2ks0 s?

  A bullet shot straight up returns to its starting point in 18 s. What is tto9.23hb * vcpudht)upcye5uo+;0 a jrtk5a. he initial speed of th+ )cjec;obakh5r2dt o y5uapu9h3t.0* up.tve bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take kk8:dr,lh vbq(iky / z40-qa-nm1szdto :(kq l- kim drq/48h vd1zay,-b s0zknreturn to its starting point?

  A ball is thrown downward from the top of a building with c +i.9xdp s0oxan initial speed of 24 m/s. It strikes the ground after 4.5 s. How high is the +sd9i0xxpoc. building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill -ha6cu2nco*: b q 9ynuin numerical value in tu2 c *c-6n uq:y9nohbahe 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 into the air with tx d,iw1: fu7ga speed of 44.0 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velqvd x2s,zzv( .f .,lohocity at t = 1.0 s?

  In Fig. below, what is the veloc hvdlgjk et;h7n(7)g8 j-2wioity at t = 2.5 s?

  In Fig. below, what dp +y,rbz(,z.b 5icj dt()lkh2 af2ukis the velocity at t = 4.0 s?

  In Fig. below, what is the velocity+1 ukuqfur2 b t/aeix)/ kv7,wz4y6 lj at t = 5.5 s?

  In Fig. below, what is the average velocity from a)l6te3 /zxpd 0 to 4.0 s?

  In Fig. below, what is the averw6,2pv8lifl 9 j,b3vqw4un q wage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?cr;jn 62yra3m

  In Fig. below, what is the acc,4-o aw +om3oavmdwr: eleration at 3.0 s?

  In Fig. below, what isvgl 7d1ymja-2 the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acce:3 n f+kzdp,0.x jl7k f::avabyy rp2hleration from 0 to 8.0 s?

  In Fig. below, what ill2- zy yi,flcz:;e5 ps the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|ve+s)gyacs55z;-czqif*o;ff mlocity}

  An object can have a varying speed if its ,ra l+9* uqexyr9(n bs7lbfo 0velocity is constant.

  The velocity of an object can be negative when its acceleration is p 8 j:izhbs9a /p1(hu.w *lkyfxositive.

  If one object has a greater speed than a second object, the first mps5i*(qeyl3: uk g a cq1y9pw3ust have a grea9:ug i3y1qsa3q*p(cpkwle 5 yter acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling:mdg4 f 2:5.l pylqyl*y3x gok 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 p-wn9 e4h0 1bpd)obvm its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It lea:jyz ugc7fl ajz+25v4 )w oo-uves the bat with a spogj u z az4-+:)jy25low7uf cveed 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 spi xj11h3,z)c trt:rrfeeds up, what is happening to its acceleration, how does it chahiz,)1 tj 1x cftrr3:rnge if air friction is ignored?

  As a freely falling oug ;vbe4bzh+ 1bject speeds up, what is happening to its acceleration, how does it change if air frictuzgvbb ;e4h+ 1ion CAN NOT be ignored?

  An object that is thrown vertically upward w,vj6cir *ur .nj4v: v-w r4;dqssn;fwill return to its original position with the same speed as it had initially if air resistance is negligible. If avr4-f wjc;s q6 j;:uw *4,vn.svrdni rir resistance is appreciable, how will this result be altered?

  An object can have z8sa ury l0 17irhf8eo2ero velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the samezl ):+fgl(r+c:is tyx time.

  An elevator moving from the second floor to the fifth floor making no stops ao *eym2 * +di6qf:xyoslong the way has zero acce odmy*e*six o +y2f:q6leration all the time.

  A rolling ball moves froq c5 4n3ak8*e wed l4yf,,drzim $x_1=3.0 \mathrm{~cm}$ to $x_2=-5.0 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lg;tm t 5b4or,efwn3b0aps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.9 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, movinjux0 78fyz ;9g imltsdjp 0vv4pabzgz; 31;s+g 115 m away in 13.0 s. It then turns abruptly and gallops haldz b3ls;xp48um9atzs j0g f0;7 v+gpy v1zi;jfway back in 4.8 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 from4 o(jecg:mqz plb /-x8 $11 \; m/s$ to $23 \; m/s$ in 5.0 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 froyw 8mu 87 ffsqsr4hbex2 +u5(em $20 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach )0 j cfva/w5iua speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top sf**az thh.xklzdy c9p9a). hf)a9l 6dpeed about dh)aahal. .h6 ltkdc*zfz9 xpy )*f9 9$10.5 \; m/s$ in the first 14.2 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 unif:b 4xygetv*dp/ochyyf0t 27 6g8kc 9formly from a speed of $18 \; m/s$ to rest in 5.82 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 e fw9wb/xa,b8 t.a +qehighway. Assuming a deceleration of e+eta 8a/b .9,qwfxbw$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goizfm -/y /gj7kcng $25 \; m/s$ 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).    $m$