Suppose that an object travels from one o 8h7hs (c ah9al1it4ypoint in space to another. Make a comparison between the displacemen(ai cloh 4yahh917t s8t and the distance traveled.

  When is the average velocity of an object equal to the insos;r2z;i 2gcb3 xg) istantaneous velocity?

  A new car manufacturer advertises that their car can go "fromi*.m momi(,lk-v+kyla,y6 xox*eg 1t zero to sixty in 8 s*k-(axixgt mo1 yiylo,m. kl6*+ vem,". This is a description of

  An object moving in the +x axis experex+4nc vmm vo- 5irk20iences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to smrg wp h*r5a5,low down as it approaches a traff*mar5p, h5w gric light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins 8c*mm u(czx2e y 5y:asto slow down as it approaches a traffic light. Make a sta 85azcuy ce*ysx2(mm: tement concerning its acceleration.

  Suppose that an object is moving with a ) czz+ 9cge:wal.u-hrconstant velocity. Make a statement concernie+cu)l9.:gaz h z crw-ng its acceleration.

  If the velocity of an object is ghdy fkz g *r:ph)ultl9-3*;qzero, does it mean that the acceleration is zero? Suh9u* q3)gthr lk g*lyfzp;:-d pport your answer with an example.

  Can an object's velocity*2 t pv9aoj,iq,h ,vax change direction when its acceleration is constant? Support your answ,a*, i9v txv jqopa2h,er with an example.

  Suppose that an objec nru8nj05de*(x mg/w gq/d(lgt is moving with constant acceleration. Make a statement concerning its motion with respect to* ggguw(e0q/dx(85rnnd j/l m time.

  Can an object have increasing speed while its accel ;et luk :5elp k7mk9)ap-qwj8eration is decreasing? Support your answer with an exj5 pkl 9 )kwktql8pe7uae:-;m ample.

  Suppose a can, after an initial k gf.; vhqfi5sh3f 2c)sick, moves up along a smooth hill of ice. Make a statement conc5sif.q3)s fh; hcv2fg erning its acceleration.

  Under what condition is average velocity equal to the averaqbrf (85jdp8(ud:vbe7q dbqv86b e q (ge of the object's initial aneb78 (q bp:(fqdvbqvj u86(b erqdd58 d final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate r u,,i9dtdmd8. However, object A accelerates for twice the time as object B. What is the finium , dr9,tdd8al speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at tsfe p7m;4l0af*.zf jh+)/qxf2ieaic he same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objeiile. h2qxp+f) c7m0 ja/;fsa*f4ezfct A compared to that of object B?

  When an object is released from rest and falls in the absence of frictio.p-vgi 9:do; xhydjk5 n, which of the following ispj9dx:;-5 o.idhygkv true concerning its motion?

  When an object is released from rest and falls in the absence of friction, which3:6e ;* wrcg jc *wjomxzq82ly of the following is true concernin8j w*o6;2g*c:yzqe c wr3lmjxg its motion?

  Suppose a ball is thrown straight up. Make a statement about the vellqh6x*9jkl x9y,zqn,ocity and the az*,lqjh9 ,yqlx 6 k9xncceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. b5*zra7/dc awfe 56a tWhat is its acceleration just before it reaches its 5ab af rat *wc57/6zedhighest point?

  Suppose a ball is thrown straight up, reaches a maximum h1(ep ba2)x- ppplgkg 8eight, then falls to its initial height. Make a statement about the di-ppxkbe gapp8 l1 g2)(rection of the velocity and acceleration as the ball is going up.

  A ball is thrown str r wdt74ol0 04duwyv1xsxx m86aight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as t 84 w040vux6sdxx1o7l mrt ydwhe ball is coming down.

  Suppose a ball is thrown downward in the absenkcmp j6o(x7v9ce of air resistance. Make a stateo96( k jvxcp7mment concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratirlimv3fyq / vy:y u :a:9thp*8on when she she reaches terminal velocity:: yvm3h 98 a:vriu/qtfy* ylp?

  A ball is thrown vertically upward with a speed v. An identicsi v0 lwi2(s2lal 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? (How many times higher does s(ll0sv2w2i ithe second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball Bz5)6id odu. vl is dropped from the same building. As time progresses, the distance between them 5d6)doil uzv.

  Ball A is dropped from the top of a building. One second later, balo( ; a+s- y51pbb(gu 7uzumgdhl B is dropped from the same building. As time progresses, the diffe7(p;hb uazo1- m(ug gdy5+subrence in their speeds

  Two objects are thrown from the top of a tall building. One is thrown upr4 m.cf)k3fubx-- /aeqdsg:i , and the other is thrown down, both with the same initial speed. What are their speeds when-s/cq kxbuf- gia: r3e).df m4 they hit the street?

  A brick is dropped from the top of a building. A second bricka8vxlqd o,1u:v- s 2oc is thrown straight down from the same building. They are released at the samol ,o:qvx12 -8ud svace time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with *pedz4e f kpp2pi9;v.5nua z;constant non-zero velocity in the +x axis. The position versus time graph of thn;5;zap k.v*zppd e2e u4p9fi is object is

  An object is moving with constant non-zero acceleration in the +x axis. Thewd;3p:e esxc)a +8dyx positx3aw+ ;)dxdpe : 8yecsion versus time graph of this object is

  An object is moving with constant u glda2dij m -vo-)a)/non-zero velocity in the +x axis. The velocity versus timv d) dioja- )la-/gm2ue graph of this object is

  An object is moving with constant non-zero acceleration in t a ee21xaj4 lj,vh)kqylw7 *x0he +x axis. The velocity versus time graphk170 alw)y av4ejxe2l*hxj,q of this object is

  The slope of a position vk*cp0xtw1( 5 f.jrndm,7uv 6+ckxbk lersus time graph gives

  The slope of a velocity versus time graph ru3iqo/+u or3s7pb 9sgives

  The area under a curve in an acceleration versus time graph gives g2-4e r) jigh )ih8vhnop),it

  The area under a curve in a velocity versus timese vo4wrjt ljdbz 5559d.it,+ graph gives

  If the position versus time graph of an object is xtywyse z:f1ko*k: ) (a horizontal line, the object kkt)::wfs (y1yxo z* eis

  If the position versus time graph of an object is a vertical line, the ob+yk- *epgm; rbject iskm- +ybgp* e;r

  If the velocity versus time graph of an object is axv 81 r5lusg9x horizontal line, the object iur1lx8xg 9s 5vs

  If the velocity versus time graph of an object is a straighty +)sa+ikc zkt* yj+:h line making an angle of 30 degrees with the time ax kh+++:j yy)t iz*scakis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distana+awn ehl psq +*b2-*wce traveled and the magnitude of the displacement veqw hs2b-w* pan+ea* +lctor.

  A boat can move at 30 km/h in still water. How u4e bul(y,i8 mlong will it take to move 12 km upstream ielm 8iub ,4u(yn a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mf /h(+u-( rv(kp xmgeai = 1609 m)

  What must be your averag,,d*r vexwd dme f.g/mmigz93a((ec u+c;*jae speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57*,+pal cvn ko( min. What is the *ap+ ( ncov,klaverage speed of the runner in m/s?

  A car travels 90 km/h. How long does it ;gry ctq/4z( atake for it to travel 400 km?

  A ly (light year) is the distance that light t, j6xy:x7vffrjzd 3 d.tvs10eravels in one year. The speed of li frv306fjx1v d:d st,x7yj.zeght 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 along a straight road and youwn4j4 d 1;1jscgsg t1z look to the side for 4.0 s, how far do you travel during this inattentive 1dtz;j s41jgscgn41 wperiod?

  If you run a complete lo 2sqfnqtx35rsf 7(m l4,da xbt-9-mnpop around an outdoor track (400 m), in 100 s, your average velocita-trltf(3xdf9 5 mqmp2snb-qx 4,ns7y is

  A polar bear starts at the North Pole. It travels 1.0 k; l,1pex z 0,oi/tx5 phutedf(m south, then 1.0 km east, th/let,e;h t xif(p 5x0u po1,zden 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 eau/ r9 gas8fiz;st, then 1.0 km north, then 1.0 km west to return to its starting point. This tripua8ig;9 sf/ zr 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. k*q+ial c;nrl s2ph+3It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown frosp+qril ;+2 ak*clhn3m school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Wha6,ne 6rp4y3y kckxz:y+ 7snm5fpqa5 ot is the average sa6zney k+y 7oc5r:3fs, 5yxkmn46 pqppeed 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. What is her h qke5p79znl:+m+eh* sitn ;daverage ;*hn+de kp 7iqsz hen+5tl:m9 speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/hejgd: oy6wu ;1 north for 750 miles. What is the averwy;:ud 6g j1eoage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs rl42xl)b.rh9.eevbd 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 l dxh)vre2bb.l.r 49e leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and c2gmt z90 ijz)ytfwrjp6f45 . aomes to a stop after 14 s. The car's average velocity during deceleration was 44 km/h. What was the car's deceleration while slowing down?)aig 6ft zry520 t94wpjmjf.z

  An airplane increases its speed from 100 m/somt l-i;n41 ieby22he to 160 m/s, at the average rate of -ity 41eoi2n ;lmbh2e$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/hk w;q/jmw -uevyi-7a)2ic. kh 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 *-hq8b bkie j8accelerates 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 10t ue f1c/;.yxz s. It then speeds up with a constant acceleration ofe/yct;.zu 1x 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 7.9 m/s experiencesg5 afq435pbsttu;f2 k a constant acceleration offkqu42t;5 pa5 sbfg t3 $2.7 \; m/s^2$. What is the cart's displacement during the first 9.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) w) pc*w(*6bvgc syec: mith a speed of 273 m/s strikes a sandbag and penetswmge y:bc p6 v)(c*c*rates a distance of 33.71 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched f6r 0bdjpzd: h1rom a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requ : 6zdhbjpr01dires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleratu1av-0; s,;7r8 yr /9ryzgjd8cq a+jcldco vaion 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 x kj.qmj ig6z0 p(k6k. uxg*7din a distance of 200 m. What is its average accelerationux(jkj 0.7zigdpk.xkqm6 *g6 ?

  An object starts from rest and undergoes uniform accelerati-cmjl3j6 3 / vfvvqq+eon. During the firstv lj/fc+3e -vqm j3qv6 second it travels 6.2 m. How far will it travel during the third second?

  An object is moving in a straight line with cons4 yr7gyh0-cz5 kup,qq tant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at r4 -z,cyp0uq g kq5hy710 m/s. How far does it move during this time?

  A car starts from restf3r re0c*)esorvy n4 9 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 obpd:o)dgbv1hv4h3 + 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 grp.sd/8d s(,ec/ emgb5asx9dreen, a car that has been waiting at the intersection starts ahead with a constant acceleration of p8ad ed/s, xebcgsr5m/d9.s($2.00 \; m/s^2$. 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 ml))m np:ng,q d7r1ta X where the acceleratrdnmqt) :7)1,anmlpgion 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 8 n1dy1;w il1wppk +ynof 12 m/s on the surface of planet X wherpyiy+1lnwnwkd1 8; p1e 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 sb) vd 9*:e70nil ff e6aafsge;itm.u6peed of 15 m/s on the surface of planet X where the acce:u;fmv*a7e0fe l ita g 6.fb)i9 n6desleration 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 a speed of 14 m/s on the surface of plane18)( 5i zgy pbcs50elqhi) tlzt X where the acceleration due5 c1 0iygsqb5t8z he))ipz l(l to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greaterdtdh,5gen64c 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 fall before you catch it?e4cdhg ,dtn65

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocrfs:lhch /; 9sn zx-7hity after 3.00 hz:-hf/r;n xs7 lhs9c s?

  A bullet shot straight up returns tv5 g+jt:i b 7.su9ewfkprpb.x(4 a3ul o its starting point in 18 s. What is the initial speed of the bullet(bp..ew tu9 f+kivb 74g: a5pusl3r xj?

  A ball is thrown strab1 u; bt3cate70qwiw) ight up with a speed of 36.0 m/s. How long does it take to return to )ebt03u iacwbw1t;7qits starting point?

  A ball is thrown downward from g wu xs,hb4)-c(p3pjnthe top of a building with an initial speed of 24 m/s. It strikes thg3psnbp(w ,u4hjx -) ce ground after 3.9 s. How high is the building?

  A ball is thrown straight up with a speed of o4 :9ofoi-- cdz/dbsn30 m/s. (only fill in numerical value in the blz o/-bdd -ncoos4:f9i anks)
(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 of8,0sllgrsf9 eidu-e ) 45.8 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.ac q5wbsy4 s260 s?

  In Fig. below, what is the velocity at t5lsw e uw k(ba18qhx07 = 2.5 s?

  In Fig. below, what is the velocity at t = 4s+ oe (uo1xeb,8v*qlqsic 02v.0 s?

  In Fig. below, what is tl+i 5hvq0v 3 suu)n8rthe velocity at t = 5.5 s?

  In Fig. below, what is the average velp7k9(txl4otj x 01vp uocity from 0 to 4.0 s?

  In Fig. below, what is the averagl,e5g1wf)l/p g gycn m)nr)y). knx.te velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at , -jlo33k-e4k/xo1g ubj cfz r-0eqi o s0thb;1.0 s?

  In Fig. below, what is the accel(2a1 slrvzkd. eration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0*+ cnd0r- dj;yu-2bafg0c eb9)cnrpg s?

  In Fig. below, what is the average acceleration n+eqgsop+u:/- 0haw j(w w gu,from 0 to 8.0 s?

  In Fig. below, what is t7wg((29 c twv7mrxg:enpsbq2e r r;/n he displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {1*u7 y el;v )6vfhj csgw*kt3i4mu sw;speed|velocity}

  An object can have a varying speed if its velocity +8-yb7lj tvdly4gg 4i is constant.

  The velocity of an object can be nega-y+d:tunuqr( -a: enl dqo6aqws z:/: tive when its acceleration is positive.

  If one object has a greater speed thci t,s6w6j613 oz9yd g:fgw ttan a second object, the first must have a greater acceleration66ogwg6yfz 1it 9,:t wtjsd3c.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spyhv15w:yzg ;c/i3 kryvju 1t* eed 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 accele* od(9s)jej)g .mt htdration decreases.

  A baseball player hits a foulu3r4wf ;q 8owt ball straight up into the air. It leaves the bat with a speed4of8tw;3r uqw 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 ( rfg/byq7kvep/c/ un6((ss a, how does it change if air frictiu/(( ryqkb/vasfpng7 /e c6s(on is ignored?

  As a freely falling object speeds up,:d(9 v th:vunov5ika.hd i.y4 what is happening to its acceleration, how does it change if air friction CA5. .hkuidivhv noyav:td:94 ( N NOT be ignored?

  An object that is thrown vertically upward will return to iy yr61jm,*lvnetj.c 3ts original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be alyml 6rej .v1 3tyn,c*jtered?

  An object can have zero velocity and nf/3 xoj5(jq gteug9p;onzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the s 1ydj,j5vqnq2.e e jf9ame time.

  An elevator moving from the second floor tl4a. 3lr*w2/ 8vv)hfqs kgtddo the fifth floor making no stops along the way has zero acceleration all thavd3g lw*2 htlf4kv/. qrd)s 8e time.

  A rolling ball moves r,6u pu 4pel*n:4y .gqgnajj1(hdek ;av2v8xfrom $x_1=1.6 \mathrm{~cm}$ to $x_2=-4.9 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around az do/y-tcpz5a u9z+5r .p2yn p quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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 straight line, moving 101 m awa8 ,+g iyxfr;p0y krqh+y in 11.1 s. It then turns abruptly and gallops halfway back in 4.6 s. kyh ;gy8xrq+p,0+fri 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 fro gzk7042excztlv8 i *hm $12 \; m/s$ to $24 \; m/s$ 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 frojw2v*0 vrbw1 rm $16 \; m/s$ to rest in a distance of 60 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of piz5emu f vd)e6n p1-ea4 z43l$33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter je(+q,5c jfgj 9kzx1 kcan burst out of the blocks to essentially top speed aboutjq,jg9k fk 1ze5x+jc( $11.2 \; m/s$ in the first 14.0 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 speed o nin4llmfz2ws fv p0 egeje2d)m1/. ,7f $20 \; m/s$ to rest in 4.06 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lc.*aye.y y ut +g7xiu4ong on the highway. Assuming a deeux+ y. ia.y4y7 cu*gtceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi( v;2tgs4w sqfv1d fi1ng $25 \; m/s$ 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 30h*my:y- *ym uq k,c*ae.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then acyymh*m-k qca,e y:* *ucelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$