Suppose that an object travels from one point in space to another. Make wuu7a+jcf q*j3:g+ve1t *evk a comparison between the d1vcej3t f *v+ek: 7uq+g*j uwaisplacement and the distance traveled.

  When is the average velocitfl2z9b)ynvh k-mz xbp2 v-.4ay of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to six(mi jp ejkq,9:ty in 8 s". This is a d(j:,pjik9 emq escription of

  An object moving in the +x axis experiences an acceler ,98grw ko9zg8h o)drlation of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directiw zcwo*;t o 6c)g+3weqon) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration e c) 6w+*wzcotoqw;g3.

  Suppose that a car traveli6s awklnmrxy+8-k 8hd pbw(- 7ng to the West (-x direction) begins to slow down as it approaches a traffic light. Maka8 n8ww76 bk+ykhls( x-m-rpde a statement concerning its acceleration.

  Suppose that an object is moving witzl 76h7dtm,f sqar g)0h a constant velocity. Make a statement concerning its accelerahlf7r76zqg m,st )0dation.

  If the velocity of an object is zero, does it mean that the acceleration is zerptz-u77d: ,zdzlu kdbc;egck+4- ax -g*yf 0ro? Support your answer ;+z-dk -dr 4z7c bcy7u* kz-e0pdl,xag t: fguwith an example.

  Can an object's velocity changeyus/ .r621q86(uwv u l0jxthac /fato direction when its acceleration is constant? Support y8yqu/66u xfa(tlv r2sot0 1.ajhu/ wcour answer with an example.

  Suppose that an object is moving with constant acceleratfj8(c ie dps s1*nq h+,48krqtion. Make a statement concerning its motion wi h*qei(kt8pc,n+s 8 s rjqf41dth respect to time.

  Can an object have increasing speed while its acceleraatv7 t (yq5v5mtion is decreasing? Support mt(v7yaqtv 55 your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ic5oxm*sbxv3xm 0s eu nz+t2(8je. Make a statement concernx *ox sj 38me zn05+(tsubxm2ving its acceleration.

  Under what condition is average velocity equal yua,4.yk o au-to the average of the object's initial and fin,k4oa.y uu-yaal velocity?

  Objects A and B both start at rest. Thehoaln9djq.w/1 q6b0 iy both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objecto0jhb9q6qad1 i./ l wn B?

  Objects A and B both start f vek-v+is*. ot*f,v 9gr3ornslrf c ;2rom rest. They both accelerate at the same rate. Hoofl fvisec.*,rrtkv9+*;s 2og3- vr nwever, 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 from rm51 n*clifjf8 est and falls in the absence of friction, which of the following is true concernli f8jnmc5*1fing its motion?

  When an object is released from rest and fallluay88vsy+ l *s in the absence of friction, which of the following is true concerning its motionlv ya*y8slu+ 8?

  Suppose a ball is thrown straigixzmyr ,d0*:ob pg;: 3mht*vx ht up. Make a statement about the velocity and the hm;:pdx,0 x tmr bo3z:y* giv*acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight g(u5afp neo wr 5 g4)j.f;ohi,up. What is its acceleration just before it reaches its highes io55(f;pj.)r,4w ehuango f gt point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fal z 1+/urvs9rlsls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going urs vzrl1/9+s up.

  A ball is thrown straight up, reaches a maximum height, then fallsbnel u4i:u-q k-7wgt + to its initial height. Make a statement about the direction of the velocity and acceleration as bwkulg4-n-ui7t +q:ethe ball is coming down.

  Suppose a ball is thrown downward in thec ;dg 0(nmmou( absence of air resistance. Make a statement cogumcm0o (;n(dncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is he ;,n+ph;hq ulhr acceleration when she she r+ hphnq,l;;hueaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identicakwm )q 3o:qj4ml 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? (Howmw3oq)4kmq j : many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One sen(5 3i/ aibacwcond later, ball B is dropped from the same building. As time progresses, the distance between them(3baic w i5/na

  Ball A is dropped from x09to j 8we:xnthe top of a building. One second later, ball B is dropped from the wx9t ej0 8:xnosame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is s.v-26y;x7w6z5a3jyigo ccu k bzn i -thrown up, and the other is thrown down-6.goi kiyayvwu -xz zj63;nsb52 cc7, both 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 second brid8 (t(o5 v2hq+ ci h7gxwcxbk;ck is thrown straight down from the same building. They are released at the same time. Neglect air reh(w cdh7(t v+ibk2c qxx58; ogsistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positionz)-q/r nwk t)z,.zpuh versusq t.znp ,urh) k-z)/wz time graph of this object is

  An object is moving with constant non-zero acceleration in the +x j*d jewch+wt 8ic5*l ;axis. The position versus time graph of this obj+j wd c*jc5* ewht;li8ect is

  An object is moving with constant non-zero b)q0 / fwq y/lsq5h li,z(4nnpvelocity in the +x axis. The velocity versus time graph of this obje5 (q ,llzynh)bn0fq// p4qs iwct is

  An object is moving with constant non-zero acceleration in theds54laq tk 4j( +x axis. The velocity versus time graph of this objlqk 54 sa(tj4dect is

  The slope of a position versus time graph glv xcx q/59 txv0hox10ives

  The slope of a velocity versus time gra tx,opk (7x;kqbf lk+.ph gives

  The area under a curve in an acceleration ve3 9gl1wj; lazersus time graph gives

  The area under a curve in a velocity versus tim7mi. o gt9l7pn;.sebhh : 6zdme graph gives

  If the position versus time graph of an object 441e2 dr-crzt td/pqg is a horizontal line, the object -pdgt rzq1/edr4t 42cis

  If the position versus time graph of an object is a vertical )ldp y4f7p2j7uexj3m line, the object is2u pxje) 47mfplyj3d7

  If the velocity versus time graph of an object is a horizonta:l4 h- un(qfke;m e6fwl line, the object iw f(ku4mqe;fhl e :n-6s

  If the velocity versus time graph of an object is a straight line mak a3+ tpfgrf x6g5n4v5zh3 frb.ing an angl.n46ff 3tgb 3rzg+5ah vxr5pf e of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and tnr5xq8x*:/k0h zi pv6keezk m:j:1quhen 11.0 m south. Find both the distance traveled and the magnitude of the:6ukjkv 5z *kxrenh/z 0xe1i::q q8mp displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 kmku+ mrjif+zq*6bm 6y8 uw7bv; upstream in a rjzm6fkv bymbq6i;+7+* r u8wuiver flowing 6.0 km/h?

  55 mi/h is how many tt kx5i(b nnqy)r25 g:m/s? (1 mi = 1609 m)

  What must be your average splwbw0mjo 8j9.;np wv1 eed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximatelyjr. l3kv0 t+idy+2ht ah1z w/f 42.0 km) in 2 hours and 57 min. What is the average speed ofa+vl2+dw0t. k1 ih jt3y/z fhr the runner in m/s?

  A car travels 90 km/h. How long does it take for it to trave n/:g/lpj4 ibvl 400 km?

  A ly (light year) is the distance that light travels in one yeagc leur3vs.q +py ,28pr. The speed of light 2,+ 8evru. 3y cpplgqsis $3.00 \times 10^8 \; m/s$. 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 syj 6r :.3b yml7zkb)ux9api 5side for 4.0 s, how far do you trav5a yykbmiz r:l.s6 pxu937bj)el during this inattentive period?

  If you run a complete loop around an outdoor yo y/3c *dhz9v ltxgezo7 066mtrack (400 m), in 100 s, your average velocity i l 3o0goc/z66vym dx*ht7ezy9s

  A polar bear starts at the Nvrfc0ll,n x6-*2w nkuorth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, nwf 2 ux0lc vlk*-n,6rthen 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 south, then 1.0 km v4asu 5xs -6xneast, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What wa45x s- 6usnvxas the bear's average velocity?

  You are driving home on a weekend frou. jwfn3;.spm m 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 .wu.p3j;fnsm minutes. How far is your hometown from school?

  A motorist travels 160 km65 nsa ebq5fe a( opi8mwneq. 8crp,z:,m7e6h at 80 km/h and 160 km at 100 km/h. What is the average sps8ion p 6abame7f(z6w.q8e qe:c n, 55p,rhmeeed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 .:v5ngw.sm ra km/h and 2.0 h at 100 km/h. What is her average speen .rsvm5. :wgad for the trip?

  An airplane travels acmunk;cp+zz(f +1 ie4ehw f:.t 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average4i1+fm+(w nc:fu;hz kz p.cee speed for the trip?

  In a 400-m relay race the anchorm0 7 dxf6zctz/ean (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 ha c zt/fdx7z06eve 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 9g -lesz.(eae after 13 s. The car's average velocity during deceleration was 59 km/h. What was the car's decel-e zs9g(ele a.eration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s,aeuk)1deab5 * at the average rate of b k*a) a1ue5de$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h 0cz 5 szxzpcvr3aa9re7u6gpbz; 5 s.4 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 accelekry))o*; nkjs 8l5bz crates 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 shoi;w)(6ocxpr-j b3 e. It then speeds up with a constant acceleratio;b3r- ih xeo(c ojwp6)n 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 7.9 m/s experiences a constant acceleratios f:+zr:mos2 vn o:srvsf+ o z2m:f $2.9 \; m/s^2$. What is the cart's displacement during the first 7.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) ,8oe9(mt,tloc xx h)twith a speed of 240 m/s strikes a sandbag and penetrates a distance of 81.08 cm. What is the ave,l8x(oettx t)9,h oc mrage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reyg(ft6 pw qjakj++ r*6aches a speed of 42 m/s at the end of the catapult, and this requirew6kp rty(+aq+ *jg jf6s 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accem:k0dzu ,x/2fpgo s1wmw+, tbleration 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 die2u5kt 5wu b m9t/vimcxvf645stance of 200 m. What is its average acceler ce95mtu4 /b5wu5it fk6v2 xvmation?

  An object starts from rest and undergoes uniform accelen:egx3ilxtyk *2k30h ration. During the first secn30k:h2tyli k*x3 g xeond it travels 5.3 m. How far will it travel during the third second?

  An object is moving in a straight line with constant1)z+gk3 twt vu:9wv st acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s.1z3wk+ t9t:vgtv) wu s How far does it move during this time?

  A car starts from rest and at4/ ue(/ tppx;: u* 73eupbb5tkrli8)xn kic 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 ro3gpj 6htwk8 l:2/egf- rd tj/fcg3q7i ad can decelerate 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 waiting at the 0)qycv8ou * z,+iwlrgintersection starts ahead with a cons*wiq 0) lyru,+gzco8v tant 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 of planet X tdy.v q5x w0he dm /xgo)k6.u.where the acceleration duek.ym6eqxxutvo /.)g5.ddw0h 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 surface of planet X vi54zmz/dip 4 /e,cam where the acceleration du/vpi emz, aic/m4d5z4e 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 1563 ex3 bqdz wp4(o4uql m/s on the surface of planet X where thw343bp ze x4o dlqqu6(e 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 with fk9.8 i t+ p;t mafj-bvkq7 3nou0t;bxa speed of 14 m/s on the surface of planet X where the accel+ka-3m;tjtb k9. 8n bf uvtqfox 07;iperation 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 greater ohh3 cbr-t:c0 wxun);et5y g.than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fc htx;wt.-cbr0)e 3 5hn:guyoall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity af0 :ih* f:jy2q v(v6pi at7mwwpter 3.00 i60pmj:piwq(a7 twv fvh :*y 2s?

  A bullet shot straight up returns to its starting point in 9 s. What is the o4ctve9 jegm00*hsw 6initial spm9g jt e46h*cwos0e v0eed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tak/p 38ql5.i glsc6pcz fe tolfcgzi 8.pp6 5/3lsqc return to its starting point?

  A ball is thrown downward from the top of a building with an inti8/by y6 gpibqn 8*.pitial speed of 11 m/s. gn8p8yqt/ .i yp*i6 bb It strikes the ground after 4.7 s. How high is the building?

  A ball is thrown straight up , 6dt 6m/hfg( qxiaz 6wtbxd*/with a speed of 30 m/s. (only fill in numerical value in fhw6t*bg ,m6axd dx(i6tq/z/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 into the air with a speed of 46.7 m/su nimhh:(ho ps;/j)8i . (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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the v(ie) 7, lp60x kh,hlylrs.ahpelocity at t = 1.0 s?

  In Fig. below, what is the velof8ed+ psynzv/aeg7 8+ city at t = 2.5 s?

  In Fig. below, what is the n4k-omx oa;22v qp9ddvelocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = t;)6 0 dgomsfllpmjj9 )xa6n35.5 s?

  In Fig. below, what is the average velocity5,u-c td8zckf /u 8iha from 0 to 4.0 s?

  In Fig. below, what is the average velocity from(: 9xgeogro.f m e0cl. 0 to 6.0 s?

  In Fig. below, what is the :yvk4yp-zh/ vo)jr 6lacceleration at 1.0 s?

  In Fig. below, what is yx1l ksc5z5t 07a )cilthe acceleration at 3.0 s?

  In Fig. below, what is the avfy9v0- w mvh-herage acceleration from 0 to 5.0 s?

  In Fig. below, what is the averuhjquw 0ms0 xs); dii8b p)99jage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 s?pus fzzi 85 k(et v73twwq.v(6

Does a car speedometer meas(:baapvu f* z6ure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velo 4/xl2i edrpb. x,h+ym dz;b+bcity is constant.

  The velocity of an obje)+r pepeaq6;q ct can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must hnmh/u,4qq:t xycag+ e *4jp r+ave a greateyjtx4+a*cg 4q ,nq prm :/euh+r acceleration.

  Two cars emerge side by side from a tunnel. Camhg e.;*w8qav4 zk0 zpzo*w)dr 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 c2xxl/rx8 4o;qp 5lbjin speed as its acceleration decreases.

  A baseball player hits a foul ball straig/rwv+cq+r rg a0* vbj4ht up into the air. It leaves the bat with a spv*jrgc4rbw+ 0+a /r vqeed 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,srb +0h 8il+f siv3;vw nbyx;. how does it change if air fric3rsvy8b+;+ .nl ;wiifv0xh sbtion is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, c bh 1*2* cfgb,myx(mly(oj0i(xq*m nhow does it changmm cgc2b,yn* qb0 *( lj1ofh((xixy*me if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to itsw tn bwn5z674o original position with the same speed as it had initially if air resistance is negligible. If az4nb6n to5w w7ir resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzeriy,:b nbt6rcx)7x* y po acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same time0 oojz3p *a/gj.

  An elevator moving from the second floor to the fifth floor making no stops al9gj8 cyn k583ze7zmwsong the way has zero acceleration allmn8cs8z579jek wg3yz the time.

  A rolling ball moves fro fgj 9qrz +;l5fyzt)i.m $x_1=3.0 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ 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 $t_1=-3.5 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quart 2avar960mkx cts)c:r er-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.5 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/f wy5hual*w+. t +qllzo1 c,p a straight line, moving 111 m away in 11.7 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its averageah/tl+ 51w pqc.z fly,wu* o+l 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 frotg r9 2o/9 o(1j*wvuu8gp ulyxm $10 \; m/s$ to $23 \; m/s$ in 5.1 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 fromh 0buuopy. m45 $20 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of eh3gkdm+b;;m :l t o 2sfyu rp8mef-78$28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essezsx0a0a -vhrrx/ +g e+ntially top speed about 0r rxa0+sax +h/zegv-$10.1 \; m/s$ in the first 11.6 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 spew.jg 13 2ryndg ss*uz5ed of $17 \; m/s$ to rest in 5.03 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leav kjyw 2ir)5+kx5h0lkf dw 9ud(es skid marks 92 m long on the highway. Assuming a deceleration of kkwu(0lrj+ 5dxkd 59 f)h2 wyi$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru5byxw1he gv:ejr4 8y*ck 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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. Afl6wz3 .pjgq6ecw ;l m,1nc r6gter exactly 27.0 min, there are still 1100 m to go. The runner c.c16jwzgnr 6emq g6lp3w l;,must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$