Suppose that an object travels from one p .wd0nzj,if bnc80f5uoint in space to another. Make a comparison between the displacement and the distjz,ni f8bn5fu 0w c0d.ance traveled.

  When is the average velocity9 ea p-(dtpe,k:bn1ojmz+gnm q:1l/c of an object equal to the instantaneous velocity?

  A new car manufacturer advertises thai ,o 6.fql0 f4tt:jfhmt their car can go "from zero to sixty in 8 s"4 m:fq6o 0t fhtfj.l,i. This is a description of

  An object moving in the +x axis experiences an acceleration ogf m3+nrbpvoo ,a/e4( f $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins obe 7kd+1njh .to slow down as it approaches a traffic light. Make a statement coen.o 7 bh1+djkncerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begink7vp3rpk2 g 9ukv1a9us to slow down as it approaches a traffic light. Ma9a k3v7g 2uu1vprk9kp ke a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a4 *jfrqxgnj0i9 :pf+f statement concerning ip9 j4q irgf0fj:n +*fxts acceleration.

  If the velocity of an object is zeroscm mxaf (**sxphsm( ,a)j(h(, does it mean that the acceleration is zero? Support your answer with an exam p( msm*ma(s(xsf( xh,ch j*)aple.

  Can an object's velocity change direction when its accezb rtu afh 7(cgo qc,c*dhk*7tu o-19-leration is constant? Support yug,1*fc *qcbrha(-z d7o9tut- ok 7h cour answer with an example.

  Suppose that an object is moving with constant acceleratio;b:7svwgwo i *n. Make a statement concewwo7iv ;g :sb*rning its motion with respect to time.

  Can an object have increasinx0av .2e k0yzng speed while its acceleration is decreasing? Suppov0e0kxz 2n. yart your answer with an example.

  Suppose a can, after an initial kick, moves uz0 0t;-.ljl5.eazhfrehnni(p along a smooth hill of ice. Make a statement concerning its acceleratio n5ah0-jh(fi.ze. trllen z0;n.

  Under what condition is average velocity equal to the average of the object's in*fiyf0zg1 g, xi0zfg, 1*y xgfitial and final velocity?

  Objects A and B both 7o+yct3- 4fwj6 ve eeestart at rest. 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 Ate-7+j4 weyec 6 3veof compared to that of object B?

  Objects A and B both start from rest. They botv 9q1mo;ijal.1.jh teh accelerate at the same rate. However, object A accelerates for twice the time as object B.iloa eqvh .;jj9 tm1.1 What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and fka5v1o0pe . sgl z g,hpw-j(q4alls in the absence of friction, which of the following is true concerning its mop v1a,o wlqh(j 4g0.5esgzp-ktion?

  When an object is released from re y .b *r(huap.us5dm+xst and falls in the absence of friction, which of theybps uxd r*au(h+5. m. following is true concerning its motion?

  Suppose a ball is thrown straight upslqj e:5q 8 g pjro,0la.c9ia0. Make a statement about the velocity and the acceleration wh:, las 0pgqojar.85 9cq lje0ien the ball reaches the highest point.

  Suppose a ball is thle,oybw af6x0698 rx o+p;g kdrown straight up. What is its acceleration just before it reaches its highesd;6rk,p abgow+6x8eo lx y0f9t point?

  Suppose a ball is thrown straight up, reaches a maxi kml m,2l6kzd)mum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerationz,)k k6mll 2md as the ball is going up.

  A ball is thrown straight up,)e r)miei 9lzre6m6p + reaches a maximum height, then falls to its initial height. Make a statezp)i)e6e69+eril mm r ment about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the aj- .g4t-u)l eg2rmtj,trmb 1obsence of air resistance. Make a statement concernin1)u--brjgm2, mr to egj 4.tltg its acceleration.

  Suppose a skydiver jumps from a high-flying plah.r u(ebxtz4/u+e; g une. What is her acceleration when she she reacu; ebez. t guh(/+x4urhes terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second btgw9 q,ieh9b ;all is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum het;e9i,9 whqgb ight 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 the top of a building. One second late4vx0ing / puj4xpw:+dr, ball B is dropped from the same building. As time progresses, the distancd0xn/u +jig4p: 4wx vpe between them

  Ball A is dropped from the i3- uq to1tlq-top of a building. One second later, ball B is dropped from tqlto -1q-u3i the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tamrf:z4b57aqy (r u5bhll building. One is thrown up, and the other is thrown down, both with the same initial sy 7u5 arqf :m(h4bbzr5peed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is th0)elfvbqrusc i: k; 47rown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of thevbfkqr7e u); s0:ic4 l two bricks.

  An object is moving with constant non-zero velocity dor ,b01c-oue )rxoki5ma - m6in the +x axis. The position versus time graph of thi)5rm uko- ,er6mbd0-c1oxao is object is

  An object is moving with const/kxpi))c.8tjybotn,dx, xz *ant non-zero acceleration in the +x axis. The position versus time graph of )b , pkcx),8ti yxznd. t*/xjothis object is

  An object is moving with constant non-zero,xuy+1 lrud/u velocity in the +x axis. The velocity versus time gr,u l y1udxu/r+aph of this object is

  An object is moving with constant non-zero acceleration in tcbr0fjqo-, gg1 /c j3nhe +x axis. The velocity versus time graph of nq1 3- ofjgc/gbj,rc0 this object is

  The slope of a position versus time graph givt5ru1pacf 2b tie*.7:go ii.ies

  The slope of a velocity versusa lr 5 7(y:2h:zbjyecb time graph gives

  The area under a curve in an acceleration versus tilw geim.o+yi x*, p758zwv1pt5h yq8c me graph gives

  The area under a curve in a velocity versutqm k*)bovd0a31( b:f:diupp u0* eyzs time graph gives

  If the position versus time tih-18w i *bukgraph of an object is a horizontal line, the object i*tbiw hk18u -is

  If the position versus time graph of an object is a vertical line, the object isx h a*:no.q h.mdsmvgne k8+62 xhoengh.d+nm*q2:m 6as v. 8k

  If the velocity versus time graph of an object is a horizontal line, the ob6.0vy.nur4 rm9 4ho jt5eeq xr49wbo uject ish.44.tx0rvbeo qum euj9r4 65rwn 9oy

  If the velocity versus time graph of an object is a stb)vm1y tc(bbp3:8i uirr,,k hcf wn3+raight line making an angle of 30 degr3 1c,kbt(b ,nybcfu:whm )+pvri3i 8rees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the disnu17hzp60e u:l:f d lrtance traveled and the ma: du1 e:lnhp07ruz6fl gnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 kmj( /*b anrqf6l upstren6 f/jbq(ar*l am in a river flowing 6.0 km/h?

  55 mi/h is how many m/sihn ux2yja r6,b8ij8t(/e8 ud? (1 mi = 1609 m)

  What must be your average sped1yhh624ae-xxyth, y;me 6 xced in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximatelygk81 3he wsr7i 42.0 km) in 2 hours and 57 min. What is 7h 1irwk8s3eg the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tm0dlp o3 ;e p4srr:o4(o;pnavravel 400 km?

  A ly (light year) is the distance that light travels in one year. The sl8)(akn z l-t /ngxub3peed of lul)x3(k 8ntg-nlz ba /ight 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 awk* ybw+ pbo* q)ybck::12karlong a straight road and you look to the side for 4.0 s, how far do you travek)r*wk2ck* w:1b+p byyaqo:bl during this inattentive period?

  If you run a complete l xxhwnkl- y3gxvy17 )6oop around an outdoor track (400 m), in 100 s, your average velocityxk nx6h3y)vx71 lg-w y is

  A polar bear starts at thr0 .:(;u wx9mgo,e (givw kilqe North Pole. It travels 1.0 km south, then 1.0 km easlgwqmgu e v:i0ikr;,wo 9.((xt, then 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 south, then 1.0 km yh /wo3(zfo,me k+ny(rr, b,yeast, then 1.0 km north, then 1.0 km west to return ok n brz(,,wo y3,rh/yyf +em(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 1xs8),fvcz0m7ejohahy35h y, 10 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 is8zya 3,ecsmxhho,5)v0j7 fyh your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 *e*sguit8.q6e ii )om km/h. What is the average speed o*gi )i6uo steq8 .im*ef the motorist for this trip?

  A motorist travels fo *bao97q7zd)amt 1dfk r 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?m9o7qbd*1f a)a dzkt7

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for ayes,wdl 9*ddk;x2 /d 750 miles. What is the adsxd y2,e9dak*d;/wl verage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) fgx snb *2c-cd *6-sjgc:gcn,eor team A can run 100 m in 9.8 s. His rival, the anchorman fosce*j gsncx2-:- 6gb cc,dng*r 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 unifs gku6p:./z6+ 5 fnfxkqvuht5ormly and comes to a stop after 13 s. The car's average velocity during deceleration was 68qf 5utkughx+6sn/kf: 5v p 6z. km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s l5qigmt h ;)6vto 160 m/s, at the average rate of 6lq h)mgv;t5i$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atv q,/r 60oxtlh 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 aqos;8j 7r ,(njg+sq xht $4.0 \; m/s^2$ 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 constant b2epe; bdev1lip+v; 7 acceleration of ve dev;bpi blp172e;+ $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.3 yax) f l3tn*o)m/s experiences a constant acceleration of3 o*)x)na tlfy $4.5 \; m/s^2$. What is the cart's displacement during the first 9.9 s of its motion?

  A bullet moving horizontally to the right (+x diota2t50i;ar6w ffo e qr9oz) 1i/mlu3rection) with a speed of 200 m/s strikes a sandbag and penetrates a distance of 25.84 cm. What is the average accelerlf61zafiit 5q )9 w3ooarromu;02et/ ation, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carriejrm-3p1zwwgb3 1xe9c/d 0m mafk x72zr. It reaches a speed of 423/g bpwe1370 x mz2zadfjkmcrw1 -9xm m/s at the 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 mb vx+hkp.eg ,4yo 2,jzoves 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 distance of pfzfsq6u1z2 1 200 m. What is its average acceleration1qs2z f1zf p6u?

  An object starts from rest and undergoes uniformr u4 lz-i6e/rl acceleration. During the first second it travels 4.9 m. How far will it tl-i 4r/ lze6urravel during the third second?

  An object is moving in a straight line with constant acceleration. Iaz .0vjlf 9l;rnitially it is traveling at 16 m/s. Three seconds later it is traveling;f j9vz al.rl0 at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleratwg0f jtp+u 7p5es 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 about5at;qc s:f t7a*ug6rj $5.0 \; m/s^2$ 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 wa zb1mk:qyjvf4.j3lxqk6o*4 c iting at the intersection starts ahead with a constanb4*v y j:c1k4jl.q63x qzk fomt 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 z/ri6fu;y 5 z hr/nz syfp2,h+of planet X where the acceleration due to y56znrihhsp2rz,/ f ;+fzu /y gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed au0mx1 + gp0etof 12 m/s on the surface of planet X wherpx aegutm10+ 0e the 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 thep0uc3h* na7 lr jyh(5fie+v 1hpcg-*k d;7osn surface of planet X where the acceleration due to gravity l01ehfungpj - nhcs k;chypr(v*3o*d+75ai7 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 thed8ft xwmb)7yyt 5evfxf ;4 .f; surface of planet X where the acceleration due to gravity) 5mtyf;7fxt4 xf; f.wbdyve8 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 /fnqd9*yk .m0.vtnaaaueq :4s. If your friend holds a ruler betweenn4m9qn.faq*: tak.yu ave 0d/ 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/:o)j xcwz 9fg velocity of 19.6 m/s. What is its velocity after 3.00 s?cjz:)f9w xg/ o

  A bullet shot straight up returns to its starting point in 7 s. What ini mey)2t i.mk 63.ita0dc)bps the initi2d c) a.keb)0mt.i3ty6p nim ial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does4iq +mhrb9v bgu*v im04j0;zj it take to return to its s0 04 iq vbhmij*;gbvrju4+zm9 tarting point?

  A ball is thrown downward from the top of a building with an initial speed of 85(kv 8 m gg38ealvzkb13 m/s. It strikes the grounm5l8z3 8bke8g(kv a vgd after 2.4 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeriae42i; m7/r aiw2holh cal value in the bi;a72h eihm/lo2 wr4a lanks)
(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 strzs6oki1u:hsv71 pn+ .q s5ck6emm:h h aight up into the air with a speed of 38.7 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 2 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 the ve a3 kac:i/wx:-tw2jfdy0pyx)1fn.vd locity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 ln/oh. lv)l 36q8wskqt8dz;e s?

  In Fig. below, what is the l.w 6h oix8kl*velocity at t = 4.0 s?

  In Fig. below, what i6wsl o:*t mkarcs;mt45ag7pe+z 1 w 5e gde:t4s the velocity at t = 5.5 s?

  In Fig. below, what is the t)8zm vys ec ,l6vw ,f*9dlv,taverage velocity from 0 to 4.0 s?

  In Fig. below, what is the(r;owg +nx+b* ugl x6v average velocity from 0 to 6.0 s?

  In Fig. below, what is the accjzd:4a e usk8ushh78zak2 -)hx2dy2 leleration at 1.0 s?

  In Fig. below, what ion)emkn*.jxv m*hm4 ,s the acceleration at 3.0 s?

  In Fig. below, what is the average acc7riy )rdmc/kh59 ;hpd ,g l3hfeleration from 0 to 5.0 s?

  In Fig. below, what is the average acceml m9h x8 s.sc,w2s pfw7j*re/leration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8 5/bevi u;ky6f.0 s?

Does a car speedomete m2u8m r3m2pi0n+uxdv r measure speed, velocity? {speed|velocity}

  An object can have a varyinguzf ;;/jncm gkfal9)p )di +w-rt.r/k speed if its velocity is constant.

  The velocity of an object can be negative when its accepb 5gi;c p ctwcih+it91/i29lleration is positive.

  If one object has a greater speed tmtl.**mp 8fmfhan a second object, the first must have a greater acceleration. flft*mm* m8p.

  Two cars emerge side by side from a tunnel. Car A is trave;rr;-py x(euz ling 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 sj*g:3 lf0xftocxck5 2hmcy44 peed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the aneogb 91s/o6h 21awgj4+ywrbir. It leaves the bat with a speed o2ejh so14gb6w /rwa91oygbn +f $120 \; km/h$. 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 accelp kk yr( i.gk8kx9))aderation, how does it change if air frict g9ka ir8(.kkxpd)yk)ion is ignored?

  As a freely falling object speeds ut dzk 7e*:tghgd5a)ie 1a1o ,pp, what is happening to its acceleration, how does it change if air friction CA)thd1* 7goa,d 1te:p kzgie5 aN NOT be ignored?

  An object that is thrown vertically upward will return to its original posi+5 v37g ghayk czu6fo:tion with the same speed as it had initially if air resistance is negligfc 5v+3hky : o76gzaguible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocityc 0t05cx-obyt and nonzero acceleration at the same time.

  An object can have nonzero velocity and mp )h sri*ec)-zero acceleration at the same time.

  An elevator moving froka-el +)awf;8l m88q feevh g8m the second floor to the fifth floor making no stops along the way has zerow+llg a8em ekh ;8f8fvq)e-a8 acceleration all the time.

  A rolling ball moves fiv(a1bkxx3a 0t(r n2n d9j;yz od9vw 8rom $x_1=2.5 \mathrm{~cm}$ to $x_2=-7.9 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $t_1=-2.2 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight 12r v+mf,fle 7hgt5 ajcomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.1 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, movin0)wh bb+* 7jluwd:gfr g 111 m away in 11.6 s. It then turns abruptly andjbgw7l0 *r:)du+w hbf gallops halfway back in 4.5 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 from w6;-ev *o eug53rhblqtz9h 6rq+ tkh4 $13 \; m/s$ to $24 \; m/s$ in 4.7 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 fromw:d;+n to4pd3 zo8mhuqabr 27 $19 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rwsi.8 vxq .h13vyfl*u/qr i,p each a speed of $33 \; m/s$ 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 essentially top speed ab g4:1vritmaq7 vj- mj: .vz6ibout r1q6 vm ja4jbm7 iiv-zt.g::v$10.9 \; m/s$ in the first 11.4 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 ab5hl 63*1 ng:l/lb5 gugpjg6- -o iiom5c aejp speed of $18 \; m/s$ to rest in 4.15 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lorrop)i x b)r/d/jk- do7 g9/o+ojvnh /ng on the highway. Assuming a decel 9 b g/x-7kor)/ojo/rhipvod +/rd jn)eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trufer a fh7m;)ajf6 9w6abda,n 5ck 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. 7rm/vb-pe wq7 After exactly 27.0 min, there are stpw-/v e7q7 mrbill 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$