Suppose that an objectuf+ m0jz9: kby travels from one point in space to another. Make a comparison between the displacement and the diy: fjz b9u0k+mstance traveled.

  When is the average vele nk3-4 1 q;.lbhmo6 kyr7ptcgocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from ze0(wlxva 43hwmro to sixty in 8 s". Thawwm h(0l vx34is is a description of

  An object moving in the +x axis experienceslem;8 b0cfdu xqa hvv.x8--f0 an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car trave4kk(va 2hf9hel9pl v; 2zgn*jling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concernik2 hvf4g;*zj enva 9kph ll(92ng its acceleration.

  Suppose that a car traveling to the West (-x direction) bzew*okt67*o gi k r9z(egins to slow down as it approaches a traffic light. Make a statement concern( kir*g k*o7te9zwo6 zing its acceleration.

  Suppose that an object is moving with at7nyvog 2wj5ch/,*lu, q xki( constant velocity. Make a statement concerning its accelerat ,5 gitlv2( yn7ok ,ucxj*qw/hion.

  If the velocity of an object iweer enr;7+:fmskem+6( wm a3s zero, does it mean that the acceleration is zero? Support your answer with mw:; 7kre++ 63mfne(e mr esawan example.

  Can an object's velocity change direction when its accelera;9ilwt g7h;dr.q jn x w,2wdf1 1alv8dtion is constant? Support your answer with an eqvn; 7 w . gl1twrxjahdw1;,i9l d2f8dxample.

  Suppose that an object is moving with constant acceleration. Make a ( yc / yn9wfx5su;9:a pnj7vvqstatement concerning itn/uy 5 v w(9qap:fj ;vs79cxnys motion with respect to time.

  Can an object have increasing speed while its acceleration is decreafj/opy o,s,t 8zf*ft 3sing? Support 8 3yfff/o,*s tzjtop ,your answer with an example.

  Suppose a can, after ljnspg7-z4mcc4o :2o50j) af sklw7 t an initial kick, moves up along a smooth hill of ice. Make a statement concerning its74st z2of 5ck:-naj 0 jglpc om)lws47 acceleration.

  Under what condition is average velocity equal to the average of thyb z9x70kjs9he object's initial and final velbx s j7k990yhzocity?

  Objects A and B bothv2a h6o1f; gfo start at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final of6vh ;a21go fspeed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same ratevtklq *7+n-p d. However, object A acceleraten pkdq*v-l7t +s 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 from r*q 992ncks soeiei8- pest and falls in the absence of friction, which of the following is true cocs -n*koe82e 9pi qsi9ncerning its motion?

  When an object is released from regvd cx7 yce86e zq:3e5g1 cm,fst and falls in the absence of friction, which of the following i7yz1c 8c,g d:fmec5 g3xqve e6s true concerning its motion?

  Suppose a ball is thrown strj2u cf98t +kwqaight up. Make a statement about the velocity and th9 c8qw+tk2uj fe acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration ju-/;8 iu olqhqgst before it reaches its higheogqqu8 h;/i-l st point?

  Suppose a ball is thrown straight up, rf ikk00g:aqq ,eaches a maximum height, then falls to its initial height. Make a statement about the 0f:i g q,q0kakdirection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum;uegd1os0 t0o height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as tde 0go;1 uo0sthe ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance.4dgzy/5f z f vnkc5f79 Make a statement concerning itnzz945f cdy5f7g fk v/s acceleration.

  Suppose a skydiver jumps from a high-flying plane.jhp+ vh- 4 f36t,o0l;qfh -srlj7g(e 6zoxjgr What is her acceleration whenjoge ;qhtrgpfxz-3(+ lj6hohj ,7fl-0 rvs64 she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical 04bowr g)g/zqgh-+dj 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 firsw4rbgq+-0/ z doh )ggjt ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped frompuq;kn3w11ko the top of a building. One second later, ball B is dropped from thunkk 1q1;wpo3e same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. Opb m70 y htg(0xn0ena7ne second later, ball B is dropped from the same building. As time progresses, the difference in their speedeh7nm y0 7pgab(xt0 0ns

  Two objects are thrown from the top of a tall building. One is thrown up, and ;ufbng,)pk2pthe other is thrown down, both with the same initial speed. What are their speeds wp) p2 gn,bkf;uhen they hit the street?

  A brick is dropped from the top nsy9 8 tt7eitg(8gl )rof a building. A second brick is thrown straight down from the same building. They are released at the same t tn e8rg 9)slt(7tyi8gime. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non9w 3f4c( jdjc8r0m hee-zero velocity in the +x axis. The position versus time graph ofc wfrc9e d j8j43(em0h this object is

  An object is moving with constant non-zero acceler b; a j6lfx:jda:8o0nh. ltao*ation in the +x axis. The position versus time graph of this oxa;a l6od:alh :*objfn0j .8 tbject is

  An object is moving with constant non-zero velocity in the +x axis. The vxx0r9aojr2;: uv cj0velocity versus time graph of 2j0xx:urovca ;9j v0rthis object is

  An object is moving with constant non-zk:vl9iexikvwv,vs-) fv5*; jero acceleration in the +x axis. The velocity versus time graph of this okf)vv: 9kixsi-*5j vvw;vel, bject is

  The slope of a positit6: hwz6cw 4yyon versus time graph gives

  The slope of a velocity versuvv,( u6-;9zbygmykaf9k t a b.s time graph gives

  The area under a curve in an acceleration versus time graph jyre7n(mn1 *rq 2:wja gives

  The area under a curve in a velocity versu+ umvewrc:7 iy6pkql4:: n4 aes time graph gives

  If the position versus time graph of an object is a horigcv ) o)zmkv;9zontal line, the object is )ogvkcm z9)v;

  If the position versus t73-athhd m2ac lc8dn(ime graph of an object is a vertical line, the object isc2-dtc 8hh la3mda(7 n

  If the velocity versus time graph of an object is a horizontal l rilke0p pgd.k0ekxrf 24 k()/ine, the object isi0g(k fer0plk.4r /kexd k)2p

  If the velocity versus time graph of an object is a straigla wc.t8qhd 7n *cxepd1xk 7d1js;3r( ht line making an angle of 30 degrees with the time axis, th1d r .;xcalwjx(3d7cn7dqh1 k *espt8e object is

  An object moves 15.0 m north and then 11.0 m sze * zts:d6rqk7u7k c0outh. Find both the distance travele k06z r7ucd7*s:zk etqd and the magnitude of the displacement vector.

  A boat can move at 30 km/h ibg jf 98r8:uiaxbccu18i-)e , v urdr(-( nxnwn still water. How long will it take to move 12 km upstream in a rive 88xufbj i(e-n,-xnb9u 1dr ar (cuw 8ivg:c)rr flowing 6.0 km/h?

  55 mi/h is how many m/s? (b7xcvg a( jvr+3x- 6vf1 mi = 1609 m)

  What must be your averag.q.m9z:,rm kj b qhnb)e speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approxim5rmr10nly -s0cyo l4qo.-bicately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in mr-os bmrn5-lyc.004l1y iqo c/s?

  A car travels 90 km/h. How long does w;-+sb gc5ispaw y4y:it take for it to travel 400 km?

  A ly (light year) is the distance th8l8fqtq0m)qcj6jm+ lwmi* *; b j7whj at light travels in one year. The speed of ligf ww t*bjclmhijj+qj )7;m8ql m0*q86ht 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 )hf/il mn2,2tt ouy5u km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inatten2,th25 f/ oluny)t muitive period?

  If you run a complete loop around an outdoor ttd q:u-hvsme.( jp 6k6rack (400 m), in 100 s, your average ve:-seqmj ph d6vt.6(k ulocity is

  A polar bear starts at the North Pole. It travels 1.0 kmns,slm06 l 3sz south, then 1.0 km east, thenlns6s0 zls3 ,m 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 speed?

  A polar bear starts at the North Pole. It travels 1.0 km souf7mg 08nzu bv1th, 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 min. What 0v f8mg7zubn1 was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles.y pbios;:2at2 It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 ya2 o:s;t 2pbiminutes. How far is your hometown from school?

  A motorist travels 160 km a3q:,04xe:z fvp f yf3lla kmm*t 80 km/h and 160 km at 100 km/h. What is the averageyz qaml:fe0pl4fmf k3 *x,:v3 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.ci 7,u bp d,qcc:qc5tm7a n+6t What is her average speed for b7:+dqit 7nc q56cup,ctcam,the trip?

  An airplane travels at 300 mi/h south fo0, )lwrdxne 4hr 2.00 h and then at 250 mi/h north for 750 miles. Whn e40,hr wld)xat is the average speed for the trip?

  In a 400-m relay race rf7 b anww+elz7/8+pdthe anchorman (the 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 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?efb+87pwa+d z7/n w rl

  A car decelerates uniform16jg6q i)vmuv c. kgm0ly and comes to a stop after 8 s. The car's average veloci.mu1)k0jcv6qimv g g 6ty during deceleration was 50 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 zlvy ,zri(c :ttp 2a ou+;go 0*dnc(9gm/s, at the average rate of dnz+o ur al9( p:igctzt(,*c g 0;yvo2$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 k cihya3bc4 ,4y-.ya* vc2iigmm/h accelerates 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 and accelerates a)p (s a64y6o( kymzifat $4.0 \; m/s^2$ 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 thez ooiv75y-i po8jii2 0n speeds up with a constant acceleration oioj 5izy-pi08o i 72vof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.6 , ;d:mol-c8 d yuit7ypm/s experiences a constant acceleration o7itycu:m y8o dl ;-,dpf $1.1 \; m/s^2$. What is the cart's displacement during the first 5.8 s of its motion?

  A bullet moving horizontally to the right (+x dikx lt5q5 60(ehcy 4jieu7rlb+rection) with a speed of 317 m/s strikes a sandbag and penetrates a+h7y(4e5l 5 xql jri06tbuce k distance of 11.90 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrij0pqc-ox nqpr4b,1, .s h vodm1+ fazw+ e*7yler. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assumin l7yzc+s,r f xo01qo+,ejapdq 4n-1wb*p v.hm g the acceleration is constant, what is the length of the catapult?

  A car starting from rj.qj ti58tev6r7s zl 0l( d7inruy8(,sm(ya rest moves 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 distanc9wt 8 ,(m3bia9t2 ,o),dnliyffcoxo pe of 200 m. What is its average acceletfox,( m9iw,yf d,oib8)onl2cp39taration?

  An object starts from rest and undergoe/gvi )o 5r5spws uniform acceleration. During the first second it travels 3.0 m. How far will it traip gws/v r55o)vel during the third second?

  An object is moving in a straight line with conso6 75/cd2c.mous fhgctant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is trd7.o62ho csmf5 gu/ccaveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at z eb0hd ,9kl**qb mp:z$3.0 \; m/s^2$. 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 decels9 y;m3bj dh/derate 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 bees6 i:b :ejg*d.ri8mw vn waiting at the intersection starts ahead wiw vje.d8:6:m*isb igrth 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 winv6adht)d: x.th a speed of 12 m/s on the surface of planet X where 6 v) h:.ddtxanthe 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 surfacew 21ek 3dz6xe.qebk-ma. )rmg*7ht gj of planet X where the acceleration due gg.17*t j3qdw.rek26k e) bxhze-m mato 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 wiqwb) g kd1w:p2th a speed of 15 m/s on the surface of planet X where)wkqwd1b 2:gp the 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 upw s7laql;h.-o jard with a speed of 14 m/s on the surface of planet X where the acceleration due to 7;olqsja.l -hgravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually grea4 i qyn-0lksh3s ,o+aater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can y4y ok-l+ssn0hi aa3q,ou expect the ruler to fall before you catch it?

  A ball is thrown upward at a vv ruf,p4jn18celocity of 19.6 m/s. What is its velocity after 3.00 frvn1p4c u,j8s?

  A bullet shot straight up returns tof ;5barzoq y,) its starting point in 20 s. What is the initial speed of ofyq a 5br;,)zthe bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Hbl h.zlkmsg(8wx1* srg u6)k7ow long does it take to returrlzw6gk)* blg.18uh kss x(7m n to its starting point?

  A ball is thrown downward from the top of a building with an initial spemiqd-gp-6 fi zco/) a3ed of 25 m/s. I3- 6mgd)-f caqpi oi/zt strikes the ground after 1.3 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nume)+4 g 5pjn w7jzhwkb*vrical value in the blanks7p g wbnk5j+*)z4vwhj)
(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 iakrxk;o +9xbs-wm 0*vnto the air with a speed of 46.6 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 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 w4h,r( hldop7x(3tl w velocity at t = 1.0 s?

  In Fig. below, what is tht1tw 6jve:0nkz / of6ae velocity at t = 2.5 s?

  In Fig. below, what is the v1uz:fqcg z63z xypm806n i z2selocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5x 4z l(fi(bzzs1q9kbhi .89pedf m;,k s?

  In Fig. below, what is the avf ,0t1f2ljvdvae d:u 0erage velocity from 0 to 4.0 s?

  In Fig. below, what is the average vh1(p;z3xu.e.qezz w,b p ancpi/ mc7* elocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratixr4vi-c s1 ro6o172hhn;nqp c8v ,qdk on at 1.0 s?

  In Fig. below, what i.6 8yxo ad*nhxs the acceleration at 3.0 s?

  In Fig. below, what is the air f7hb28i8for 9s3mmverage acceleration from 0 to 5.0 s?

  In Fig. below, what is the av*a pvlo3 bb9u*lix w-s 6v5c,gerage acceleration from 0 to 8.0 s?

  In Fig. below, what is /*gr e+sty;iethe displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocit b8d(/ y-uw73m poa4zh6qo xvd+i :gfly? {speed|velocity}

  An object can have a varying speed if its veloc+i)8eon b)t +1xaklc1qa1 fe iity is constant.

  The velocity of an object can be negative when its accsvb z132e lmo.eleration is positive.

  If one object has a d 9enz)wy60 7gl9d8usi7 ujnkgreater speed than a second object, the first must have a greater 7z)ie7dgwy08su jn n69lu dk9 acceleration.

  Two cars emerge side by side from a tunnel. Car8 eow)**au t l.p-qcc b-jifjp 9n/1m 2xoj0rq A is traveling 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 acceleratioc5eixf 3s bl-g2d*-so n decreases.

  A baseball player hits a foul ball str,v/ ,m v9dkhiqaight up into the air. It leaves the bat with a spvm9/hd q ,v,ikeed 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 is happening to its acceleration, q wx,yr4z *3nijfozv* rsyj-+rm,0+w how does+sf3,y4jyz 0, m rnij-r *ox+* wwvqzr it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration,ch6- brcokmnnc81puwg096s42 x ii dw,).skz how do,prodxwn wimn - c8c ksk 0iu.z)g2 h4s16b69ces it change if air friction CAN NOT be ignored?

  An object that is thrown mii+ g;oy6w wg;atz8 iv e(qpy b38y65vertically upward will return to its original position with the same speed as it had initially if air resistance is negligz 8bi36yyae8g viw5 mgwop (;y qt6i;+ible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same timukba :r h:yy/+zg-f/ ne.

  An object can have nonzero velocity and zero acceleration atbgjq*-*ig+fqa sh:h0vcd 7fgge *q. ( the same time.

  An elevator moving from the second floor to th)mp:o4 lcb6l (/ uh3pwkgpc 0pe fifth floor making no stops along the way has zero acceleration all 3/lhpc6mp o(w p):gcb 4u0plkthe time.

  A rolling ball moves frgxanh1y 8)x)w 8i.fx fom $x_1=2.8 \mathrm{~cm}$ to $x_2=-6.3 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. 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 $x_1=2.4 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-minzcb, /.ty m/zrrq11ji * vi*b4mnj:yle ($1 \; mile = 1609 \; m$) track in a total time of 11.0 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 straighkd 9qgxy 2x/x2t line, moving 100 m away in 9.1 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average y9dx/ gxkq2x 2speed  (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 dx4 trkcv-e+0brg8-ta.6x;w;dvp vo $11 \; m/s$ to $23 \; m/s$ in 4.9 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 fromt-6+m v) swk;dd *scquc33jpm $17 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed6ht zkbv7 c/7d 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 essential7zt l; 1s4 kaf fyw-4c06bbjb2deqh 5yz(9mddly top speed about fmdlzf-d4w7 109y c2 4 sba5(eqdb ;hzyjtb6k$10.5 \; m/s$ 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 uniformly from a speed of lk6gze1 bd163i sc). tk ;ha(t ubub1n$20 \; m/s$ to rest in 5.90 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. )csp;w(o: u prAssuming a deceleration o(pw):u; pcsrof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trc (nref13xe( s3tz570d;n ytnovjlf( uck going $25 \; m/s$ 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).    $m$