Suppose that an objecp5g, jf0 j0s 9izxr1lw.kml8rs8 j:nnt travels from one point in space to another. Make a comparison between the displacement and the distance travz9pk8l.grrsf0j ,x5 nwjm:08nsj i 1l eled.

  When is the average 1as c8fza v:wsfr4/ z*velocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that thedh7 p m 0bu69wn/iyv pijv048jir car can go "from zero to sixty in 8 s". This is a den8 iv90p0 y mijp/jw 7vh64budscription of

  An object moving in the +x axis experiences an acc8dhxvbtoug2n+: xfy:r :j;5 feleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traugep)te+-vq hubox :5wfg 3 -;veling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its ac-pvg-;+3b5wqu: uteg o)fe hxceleration.

  Suppose that a car traveling to the West (-x direction) begins to satgp r0 nb r u)(2w;lxo888nbglow down as it approaches a traffic light. M8wgr(u;b8n2 lr n0)xtpoa b 8gake a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity.swice5f;,jo ode 34/cn8i x*y yj5u8 c Make a statement concerning its acceioo35ijy8f5xcjy ewd n c e,;cu s*/84leration.

  If the velocity of an object is zerp-gnt.:xp no3f.ct xje ppva e1cjs9479y1u9o, does it mean that the acceleration is zero? Support your answer wvxj97xjgfpuyt 1.9nap-nppt 4e s.c3e :o 91cith an example.

  Can an object's velocity change direction when its a5 mwe-dh:t6s scceleration is constant? Support your answer with adse6-w t5h:msn example.

  Suppose that an object is moving with constant acceleration. Makcpn2 0sk.t(e ge a statement cocsn0tge .(k2pncerning its motion with respect to time.

  Can an object have increasing speed gry8vt . i1pl,n3 jo8 *t:kvy6sn(rfq while its acceleration is decreasing? Support yourl. r,i8nnty1g*3jf8t 6s k :yvpr qvo( answer with an example.

  Suppose a can, after an initial kiatipa s1-ji8/h k,f6 cck, moves up along a smooth hill of ice. Make a statemenhp 6f-atc18s/,i ijk at concerning its acceleration.

  Under what condition is average velocity equal to the average of the object'svef19q: gm0+ zlv*e ft initial and final velov e+fz* :1lteqmfg0v9city?

  Objects A and B both start at re-ohk1z fr6x9 yst. They 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 object B?rk1y9 fx6-h oz

  Objects A and B both start from rest. They both accu5c s56mr/kvs elerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance tras sv6/5ck5ru mveled by object A compared to that of object B?

  When an object is released4zf cg/ d4:duh from rest and falls in the absence of friction, which of the following is trg :fdc4udz/4 hue concerning its motion?

  When an object is released from rest and falls in the absence of friction. fvkga8os+)p ofwx1pi/wy6 -, which of the following is tr y6 oka.p+8iwwgpfx/s-fv 1)oue concerning its motion?

  Suppose a ball is thrown stra (4cd2uc9s, py+ cnokgight up. Make a statement about the velocity and the acceleration when the ball reakso,cyn c+c9d2gu4 p (ches the highest point.

  Suppose a ball is thrown straight upz.ks6: duurhy: zxw) ;. What is its acceleration just before it reaches its highest pou. xydrz )ks:uwz;h:6 int?

  Suppose a ball is thrown straight up, reaches a maximum heigope 5h4ya4 c- :di)jjdei 8n*nht, then falls to its initial height. Make a statement about the directihc n)pj- n5 jdya8dei4:4eoi*on of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximtcj8 + li n4-tbtn,wo9um height, then falls to its initial height. Make a statement about the direction of the ve8w-+ nb l cit,jnt9to4locity and acceleration as the ball is coming down.

  Suppose a ball is thrown downwardo0 nyt4-xaz-p u ai9 g:rdk(0p in the absence of air resistance. Make a statement concerning its( gxo0pdi a4r9nzatu y0- kp-: acceleration.

  Suppose a skydiver jumps from a high-flyil :lv;e) jhnm+ng plane. What is her acceleration when she she reaches terminal vel ;hlnelj):v m+ocity?

  A ball is thrown vertically upward with a speed v. An identical second ball is mq7 ( . 8dq0mdut+q f8-eg+uozekz8la 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 does tqt(l8duze 8 8qom 7z+0+d.a-f qemukghe second ball go than the first ball?)

  Ball A is dropped from the top of a building. Oq+hyt bi6y +i8) fgivnh 3)z)ene second later, ball B is dropped from the same buil3i 8in )fht hg+yqv6ye +zb)i)ding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is9t6g rtc/y h4m dropped from the same building. As tim yhcm9g t6/t4re progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, 4 o ;xtm4156-lbx es bfpt.xazand the other is thrown down, both with4xoteb af51pbl .m- sz6;xxt4 the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A u/zs-.toru, a-l 3dbn second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistancezosun ,tb3a-u.rld / -. Compare the accelerations of the two bricks.

  An object is moving with constant non-z 55ho gxr9m3xg /wqwl)ero velocity in the +x axis. The position versus time graph of this object iswm g q/xgx59o5)w3h rl

  An object is moving with constant non-zero acceleration in te x)jf io.+q0qhe +x axis. The position versus time graphx. eq0ji+)q fo of this object is

  An object is moving with constant non-zero velocity in the +tv.caslw1 b +7m5j6c ax axis. The velocity versus timm5lcv7 jc s61at.+ wbae graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. ;czc8 06ahxl vbs:sm,The velocity versus time graph 0c,cls:;8 m vazbh 6xsof this object is

  The slope of a position versus time graph gives07rkjmp0 1y pctc( /no

  The slope of a velocity versus time graph qsa z:x5exkac:+d3 ;sgives

  The area under a curve in an acceleration versus tc czna7xk3o8 , +rmq/pime graph gives

  The area under a curve in a velocity versus time graph giv*v bfsxf1-mfle1lz .9es

  If the position versus time graph of an object is a horiz4r* n)8tdop5p 8meu qnontal line, the object ntnqme)4 8po pr*8u5dis

  If the position versus time graph of an object is a verticaqdnhn.b1 19:emzxa5z* 6tserl line, the object isebn:dsn5maze 9x6 r*h1tq.z1

  If the velocity versus time graph of an object is a z.v0 k9qcr67m wsbym8 horizontal line, the object 09kqw6. r vmcb87s mzyis

  If the velocity versus time graph of an object is a straight line 3 *a0 ymsd: gmy)oyx;bmaking an angle of 30 degrees with the time axis, the object0bg dm m3y):y* osx;ay is

  An object moves 15.0 m north and then 11.0 m south. Find vk9q pnf76*chboth the distance traveled and the magnitu9kfc6vh q7p*nde of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to m *ur--hma 7hzq vd-lj.ove 12 km upstrh.a-7mjd l*u--r hvzq eam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi z,l;d*x) :tt g:fa zw8g3aifi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 he, , ll*uhpo3l?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. W9 mzhe3c 4qhfc:bd.k2hat is the av cq2hkmfb.934h c:ezderage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 km?f7m42gh 8,+s e wgoref

  A ly (light year) is the distance that light ts*mk 1qeep)v(5hc0tdf i kz50ap ;o 4sravels in one year. The speed of ligqpvkd(t5 p *em5z f1s isko4)0ech 0a;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 a:/yt fl,36)wrm no9;bg sk qe-s+prlnlong a straight road and you look to the side for 4.0 s, how far do you travel during thirf,n9 : r6 nt+wys3 ls)e-m;pg/bolq ks inattentive period?

  If you run a complete loop around an z+)p fw,:gwnk9h +5cm 8lu6jatu/xvaoutdoor track (400 m), in 100 s, your average velocit5fm a v)ju6/xckgp +a+8l9hw:zu,nw ty is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km ew;tni e1 /2cz8xz y7fl0z w3vjast, then 1.0 km north, then 1.0 km west to return to its starting point. This trztw;1z0zx v c l f2we73jin8/yip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Po7 sn+m g)1xbyzle. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to r ny+m7zs 1bxg)eturn 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 110 miles,w barp5p3o1t . It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4t,o1pr ab5 pw3 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 khgr* 6xxrx :z0m/h. What is the average speed of the motorist for this tri*xz r rgx0x:h6p?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at h ukkza*n:nex6k uep 07ov -:0100 km/h. What is her average speed for ukk0o k- uz v:e*hexp7:06annthe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fblasy8ab vdfc0)2 e fa+:p03 , rz+pqtor 750 ,a badv q+ef p+y az80l r:c23tbsf)p0miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 su3-v e8nw5f x5:u aokm) 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 w8:v-uekuxas3 f5on5 A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly xj tosh4-93yy and comes to a stop after 10 s. The car's average velocity during deceleration was 45 km/h. What was the car's deceleration while slts4x9-j oh yy3owing down?

  An airplane increases its speed from 100 m/s to 16iut n 1 y4e:w(z3qih18cwxo6z0 m/s, at the average rate of 6( qewuyc: hxwi3z8zo1i41 nt$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/ wz/on4 7ru-kh 4pzvr**(sfluh 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 accele8*bvq h0cwsbi. wxv6o: cx4a3 rates 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 sjc+oz9nw q j .,urem8.peeds up with a constant acceleratio8uo.m+e. jjw9nr,qc zn of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initialjd.l9f6c b,kjw76 s w;pxx0 yg velocity of 7.5 m/s experiences a constant acceleration of g pw7j;xdf lk9.b wjsx0c,y6 6$3.9 \; m/s^2$. What is the cart's displacement during the first 6.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 411 m/sjktv6b d(32s9:(jlog zsikx4 strikes ax( 4jl:jksgd2t3z 9bsk v o(6i sandbag and penetrates a distance of 42.84 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 ck/o 3yv 0/1d dp)lmhyparrier. It reaches a speed of 42 m/s at the 0pd pdy3k mlhvo )y1//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 moves with constot)**,t s*bal wf:8c gghm m)lfgj2s)ant 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 distance of 20vn5d 91bac ,ec1vo kq5 m3e cw1c3m dlaev0+q20 m. What is its average acceler5 32dce19v5 bqcqc,01avnm3a eodkw1cl vme+ ation?

  An object starts from rest and undergoes uniform accoj mh7eb9 ,zn(1 lg/aneleration. During the first second it travels 5.1 enh/ gmo71n, j9a l(bzm. How far will it travel during the third second?

  An object is moving in a straight line with constant accele)vr :fsejg(m1 q)do2eration. Initially it is traveling at 16 f(:d 2qgeo s1)jmrv) em/s. 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 unifors/sjdu 6h/c6 py:nv2 dmly 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 hdmyoy8fgo .dh( 4w+8 on a dry road 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 iho hhw0 vv-+7tntersection starts ahead with a consv ohv+w0hh-7 ttant 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 126ma *dsu)c/lg m/s on the surface of planet X wheu dl)c*a/gms6re the 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 sur j/gx9byk l-f; *ycw5iface of planet X where the accelera w5f bci9/ ygk*x-y;ljtion 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 s4:x 0mskbicr jt*d3ths0 j4 b3urface of planet X where the acceleration ddttcj 4smj3x0ibh 34srkb*0: ue 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 surface of planesbh*f wn6vg3vz)(t* u t X where the acceleration due to grav v s3wz h6(*nuvbg*tf)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 your friend holds 4d3iwohdw n 8-wwco79 a ruler between your ohw w79-wc3doni84d w 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 19.6 m/s. What is its velocity af7c2t 6 caelg9bter 3.00 2t 6g 97cbecals?

  A bullet shot straight up retz(z8s1f2+ hl)hzc yx nurns to its starting point in 6 s. What is the initial s) 8zzfhy (cslxh1zn+ 2peed of the bullet?

  A ball is thrown straight up with a sp -qhqh+5l74lq nqv, zzeed of 36.0 m/s. How long does it take to returnqzq7qh-,4hv nl5 qlz+ to its starting point?

  A ball is thrown downward from the top of a q+5l8+ ykbfs6 ,mcmkl building with an initial speed of 19 m/s. It strim56qc + l+,b km8ylfkskes the ground after 5.5 s. How high is the building?

  A ball is thrown straight up with a speed of 3g;mu e*g9 ikm. oe ly9(qbc.cgw.*1qw0 m/s. (only fill in numerical value in th;q9c (*kl1*c e mg gwbw.y9g.uoei.m qe 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 straight5meg vo(57h mx up into the air with a speed of 25.8 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 pw36g(9ust q hs?

  In Fig. below, what is the velocity at t = 2.5 sjazcfit/me l;:k.w27r q1.n a?

  In Fig. below, what is the velocity at t = 4tfxsn2p2n 3ik6)z 8ve.0 s?

  In Fig. below, what is the vqrtuv- 9kj-n9 u3j8jl 6xrqf (elocity at t = 5.5 s?

  In Fig. below, what is the aa*m mvm9i9d16* rjnxt verage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fro 57at vfa wqpbd(ek),4m 0 to 6.0 s?

  In Fig. below, what is the accel9aq*kv ,tkr2 teration at 1.0 s?

  In Fig. below, what is the a3 n t(f0npeoow; pm; )rfr9r94d:xfrycceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s? mbo (oecy.04b p51qpq

  In Fig. below, what is the average acceleration from 0 to 8.0 c :s;argnf5: sz*wqr+7d(pdps?

  In Fig. below, what is the displacement frol/8o o;43 m z(las ;c+-4pejiu gmhxtim 0 to 8.0 s?

Does a car speedometer mea3jgivm :by6g *sure speed, velocity? {speed|velocity}

  An object can have a varying speed if im4neke;9 u* ; xjndvw(ts velocity is constant.

  The velocity of an object can be negative when itk.36 6;:jmuougov. alb6rnpts acceleration is positive.

  If one object has a ghdvz cbw(/zmlix, +7j1 4mq zdxp-4.creater speed than a second object, the first must have a greater ac(1-zbc 7d4z.hwldxm4 c,q zx+m/pvijceleration.

  Two cars emerge side by side from a tunnel. Car A is traveli/2d+q5,j xarx oqr- b sr4swt2+hs ay)ng 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 r 8mllqrn:n7t.k.j6m as its acceleration decreases.

  A baseball player hits a foul ball straight up into theek3m1;6c ntob air. It leaves the bat with a speed of kmno;t 136 bec$120 \; km/h$. 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 imfab 4v3wy s,82;ea01mtla8o ongl6lts acceleration, how does it change if air friction is igv aoowyes2gfa1 lln68 mt8 4 am0;,bl3nored?

  As a freely falling object speeds up, what is happening to its actf ks;o3-h l2z4,g plgceleration, how does it change if air f; gl lz2,ok-sf4hptg3riction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original position nv jtp*0) av6iwit*t0 ) vjp6ianvh the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceldo*h: t3 lp u,vqxbjl8,nc4f*eration at the same time.

  An object can have nonzero velocity and zero acceleratic,*ccco *;qp7rpd my5on at the same time.

  An elevator moving from the second floor o6lj dq2avf0 -to the fifth floor making no stops along the way has zero ac 6 j-fo2avlq0dceleration all the time.

  A rolling ball moves f/icf /f7es 8mqrom $x_1=1.9 \mathrm{~cm}$ to $x_2=-6.4 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cslkq mxxu(osyux/ c1 1y8(8b;omplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.2 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 95 m away ink-0eqs).1d2 1fi9:y l zsk quyssh gtxh 03m+u 13.2 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average 09l0k e-:s y +3kdu.qqi )zmt sussghxf211yhspeed  (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 fromi-:p9 mu viy+u $12 \; m/s$ to $23 \; m/s$ 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 from 8fn2-vqdppb v.f n:,l$21 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reahpb55hh0 ;-n 8tkvygz3;hvp nch a speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out ofshj. d11g ;bphn7gdmgz)3 n;esv7o 2f the blocks to essentially top speed about;g3f2 1 ;zn1b.h) d7shgmgsven 7jo dp $11.4 \; m/s$ in the first 12.0 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 sp-8 x:,h7 vsjs1cha plteed of $15 \; m/s$ to rest in 5.78 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop,t xa/8n b78rmgrbw8b) a car leaves skid marks 92 m long on the highway. Assuming a deceler8t b8gbn8mwrx )/ba7ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru6 . 2aqucyd2kock 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.)/iq)-z. qede usdaxe x,z-y9 After exactly 27.0 min, there are still 1100 m to go. The runner must x.qad/i-)qsx 9d) u -zeze,ey then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$