Suppose that an object travels from one point inc4fx-n b zxqu- gz6s(; gn3sk0ih; s(p space to another. Make a compa (k-qpx( u3 sg;-isgb6 ; zxc04hsfnznrison between the displacement and the distance traveled.

  When is the average velociad vyi o z++d9x3*xg:dq pu;+bty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises t;v3fjm nzl5s; *4iifshat their car can go "from zero to sixty in 8 s". This is a description ssjfiv4 5;nm;i*zf3l of

  An object moving in the +x axis eaf0cig fwg7/c5w: *2 x v4uprdxperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (g- s xw0c;bx.j+x direction) begins to slow down as it approaches a traffic light. Make a statement concerbxj ;. gx0wsc-ning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sh-p1pg w1i 8gglow down as it approaches a traffic light. Make a statement concerning gwi -1phpg8g 1its acceleration.

  Suppose that an object is moving with a constant velocity. eg 2ihoz6p1+ l Make a statement concerning its accelerationz+l1 ip62 oegh.

  If the velocity of an objl 0 m1mn6pz./vri.pra+iyb4d ect is zero, does it mean that the acceleration is zero? Support your answer with an exy i+/z16p 4vdlparn .m.i0r bmample.

  Can an object's velocity change direction whevw+ra -vevv u l.k;5u8u9*otv n its acceleration is constant? Support youu-vwv*uu9rv t5;l a8ve.okv + r answer with an example.

  Suppose that an object is moving with consta7 y0 au/*yo5ste 2zenent acceleration. Make a statement concerning its motion with respe o2 0sey/n7z5a*eytuect to time.

  Can an object have increasing speed while its acceleratiop hb y;sw.1)zvtsg*+zd4jdd 9n is decreasing? Support your 1j*d gw)sd d;+pz4z. sh9y tvbanswer with an example.

  Suppose a can, after an initiald-asf2,)amp7 z-gr ku kick, moves up along a smooth hill of ice. Make a statement conck7, zp s-f-r a)g2uadmerning its acceleration.

  Under what condition is average velocied e6v-doolbk .1y+(o q*tjf2ty equal to the average of the object's initial and fi + ooqkj6b-f l.t2edy*d(o 1evnal velocity?

  Objects A and B both start at rest. They both accelerate at td88 kf0 f2 7vkdte(bd njj*52lnu2fkthe same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared toj k 5 fdj8kf(dknt2b28ed2tflv n*u07 that of object B?

  Objects A and B both start from rest. They both zrn k ,3ch2q9i0gkfn6 accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distan0 n3kfrq6,2n i gzkhc9ce traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absencdmnf hu:sqpz p 3f(cx:ss8(w 1,d2:pfe of friction, which of the fo(f:x1fsu:fpnw2 qz(dp d: c,hss8m3pllowing is true concerning its motion?

  When an object is releas,yh9l gq2vi:e+l b hr+ed from rest and falls in the absence of friction, which+glhv b,qhi:l 9y2+r e of the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and :di u+9b4ohvv the acceleration when the ball reh9oi4 vud+v: baches the highest point.

  Suppose a ball is thrown straight up. What /ey vmjm-je1 3is its acceleration just before it reaches its hjyvj eem31- /mighest point?

  Suppose a ball is thrown straighpag7i a7ee,c44kk .cjt up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as a 7j.4kck 4a ecg,pe7ithe ball is going up.

  A ball is thrown straight up, vl)9k7s; kx nhreaches a maximum height, then falls to its initial height. Make a statement about the direction of79;s ) xnvkklh the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a stpv6o o.8 )avseatement concerning its acceleration. v soa)p8.6ove

  Suppose a skydiver jumps from a high-flying plane. What is her ob,8h:n2cz8 i9zbr+ ( s-b o/o ry7kycqly3yjacceleration when she she reache7bojzls-2:oq(r + o ,yci y 3hyk bb8z/cnr8y9s terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball is ng+ :+waz0ozobe* dp1 thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that1w obea n*dpo:zz0g+ + 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 bum o* fi ffq.c g/9b o5ea/4m8;pjypq+24 blmcsilding. One second later, ball B is dropped from the same buifgf4.;e /pob+bjmiy*ca4o/8 qm92p m fs5qlclding. As time progresses, the distance between them

  Ball A is dropped from the top of e*qar d2y5 ap+a building. One second later, ball B is dropped *r+yq2d5a apefrom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from l,* df7/ b2fasc3n bxrthe top of a tall building. One is thrown up, and the other is thrown down, both with the same d3n ffxlba*/r c2sb7 ,initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick id26 k) 7 xmot kkv7.)ce6mzngks thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the cg vkmk n )kzo)d6mk7.t7x2e 6two bricks.

  An object is moving with constant non-zero velocity in the +x axw w;49eczacm4is. The position versus time graph of this objeczw; 4c94e cmwat is

  An object is moving with constant non-zero acceleration ing5gb0iv-8lbl,z4gw v the +x axis. The position versus time graph of this objzv8l-4gv bw lg, big50ect is

  An object is moving with constant non-zer/85iwb7 tfyd.xh1sgi o *ij g)o velocity in the +x axis. The velocity vw /.t* )xidiogysfb5 ijg8h71ersus time graph of this object is

  An object is moving with constant non-zero accelerati7/v:ri w*( +5 vs0bdwtlsq4 knvz)inzon in the +x axis. The velocity i50in*:zl/t( wn+qrsv v )w z k7sbdv4versus time graph of this object is

  The slope of a position gic(dd 2rjsqot 57grj2m0;u9versus time graph gives

  The slope of a velocity f5e..w*8bid3ii dn wk versus time graph gives

  The area under a curve in an acceleration versus time graph rnw 6h0zu5*apgives

  The area under a curve in a vsm 2/zku -g .a qjwybwhhu.tn40t+s/2elocity versus time graph gives

  If the position versus time graphr o/s(5eopy)n of an object is a horizontal line, the object iy5 n)r /opeo(ss

  If the position versus time graph of an object is a vertical line, tocit6ju25wc c(kb3 a 4he object isca(i5c ujb2kc64t ow3

  If the velocity versus time u)do 61s+*s cnyunxbk.zy0v 0graph of an object is a horizontal line, the object isy)d0buys0+n s1c knz*x .ou 6v

  If the velocity versus/e7q3xv2k s+vvn/zw j time graph of an object is a straight line making an angle of 30 dvzne7xv 2//j +qkswv3egrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sg9cmz bs7* g2douth. Find both the distance traveled and the ma c7gs2*m dgbz9gnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 1u vd1 pew4)(pz2 km upstream in a rive1vp(dzwp4 e )ur flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609cp0;b)a0l tj7kj cqo;hyx4 7i m)

  What must be your average speed in order to trave)b7cc14urb 0i;ykg9fdd wzr rgt d198l 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. W nk,vkf33w 4tbhat is the average sp3btvw4fn , k3keed of the runner in m/s?

  A car travels 90 km/h. How long does it tak83atp q7y8;8 ratd vkie for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speedgl i o+a57knbyu8/q ;9pfu5b z of light+5p9unz;uiyf8lo5 q7b/agkb 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 j-5xmy d.-kjvroad and you look to the side for 4.0 s, how far do you travel duri vj.x-y -d5mjkng this inattentive period?

  If you run a complete loop around an outdoor track (400 td v)fq/7ecv+w5pz *k1oaey 4m), in 100 s, your average velowa) v5tep14oqkfzy+e7 c/ dv *city is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km easy) 2*qf tg(gwpt, p(g)f t *wqg2ythen 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, thn :iz+as vrqx2u(: h fc(het-u/y.0nwen 1.0 km east, then 1.0 km sc0+f hhr-tn zwiqv(.x an:(/yuu:e2north, then 1.0 km west to return 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 milr rxq8/k4 ;tfses. It then starts to s x; f4r8qr/tsknow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 1x fb+b8 lk: qd*7xe+e7v30nggw 8kgjb00 km/h. What is the average speed of the motorist for this tbjg 7lnk3k8+g:x efq e x+0 v*bdb7gw8rip?

  A motorist travels for 3.0 h at 8fke p3)lwza)*y oq/y*fz 1tt30 km/h and 2.0 h at 100 km/h. What is her averagfotq*yeatp )3lf)wy z1* z3k/e speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for h+r;aianv;dm+*1 zdc t/-n fm 7;++/zma v-;i r1 dtma cnfhd*n50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (thmy: ca9-ku js9e person who runs the last 100 m) for team A can run 100 m in 9.8 s. 9a -:9kujysc mHis 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?

  A car decelerates uniformly and comes to a stop after 12 s. pef nt *,8tg0-rb smpx/4g1r k The car's average velocity dxgf4g/pnr p es8,bt0*-k mt r1uring deceleration was 70 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at tjht,1j tcxr0 h.,me8qhe average rate of qh,c .,8jmet rt hx0j1$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acchzpx,m)* q62xb7kr9d xkl 4vuelerates 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 accelecruxjrs7*y ,j+tc :o: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 thencr g4hf8np5j f *v9;dp speeds up with a constant acceleratiocp 5df;498v* nhjfgprn 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 4.9 m/s experiences a constant accelerattq,3qh a.l v+ts;snki p 3(j,eion osh ;tq . ,si+t, j3lap(nvk3qef $1.7 \; m/s^2$. What is the cart's displacement during the first 6.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed ofao7l fc, 75lrt 440 m/s strikes a sandbag cfrtl, 5al 77oand penetrates a distance of 90.69 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fro7sz 6m/yw l+rfm a catapult on an aircraft carrier. It reaches a speed r76yl zw m+/fsof 42 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 moves with constant acceleration yp6;tt:8c kq mof $2.0 \; m/s^2$ 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 200 m. What is its avernu;msm; f9/ t;cx l5:cg9ogbuage accl;n muuog9m ct:c g;bs9f;5x/eleration?

  An object starts from rest and undergoes uniform a:*0osd dhg+lh cceleration. During the first second it travels 3.8 m. H*gdl 0o sh:d+how far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initia; ft,k5ji+h e;wxc)y flly it is traveling at 1 itykxhejf; 5, )+c;wf6 m/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 uniformb2tw2n zhx+mx9s ;, yrly 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)r2c tq958hz+ ,cvbt j l4iqzc 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 lighb/s+ of hhuu(6t turns green, a car that has been waiting at the intersho+/6b shu(f uection starts ahead with 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 with a speed of 12 msr**qwqp)r -fb,7ewy /s on the surface of planet X whe*bw r*y)seq7 qwrp,-fre 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 wity):5 z5j,pa-am , irhe6oy ambh a speed of 12 m/s on the surface of planet X where the acceleration due to graa5yo pma h,yzm ra5b:6je),i-vity 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 tfs;0pw( 7wbkmycf36 2mpsht 3he surface of planet X where the acceleration due to gravit s62c m;3kf(7w pmtp3bsywfh0 y 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 surfacezg.5 tf. isk,w of planet X where the acceleratiot5fg. i,wk.szn 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 than 0.10 s. If your fri(g2 0xg-vpgig end holds a ruler between your fingers and releases it without warning, how far can you expect the g x2gig(vp- g0ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What z3n7z-fj* zfc is its velocity after 3jcz3*f -f zz7n.00 s?

  A bullet shot straight699gsnzupguvxhcwoh8i9h+ 3 );dt0 ju m 2de( up returns to its starting point in 13 s. What is the initial speed szendd9w2go9h86 it3 p+9m )hguj0xch(uv u ;of the bullet?

  A ball is thrown stra;:sl/x hsrqj9 ight up with a speed of 36.0 m/s. How long does it take to return to 9:j/;sh l qrsxits starting point?

  A ball is thrown downward from the top of a building with an imew/9*cvvn2ie0djnv l 7d+9i nitial speed of 23 m/s. It strikes the ground after elnc9vii* /29ve+0jd mdnv w75.2 s. How high is the building?

  A ball is thrown straight up with a speed of .9n2:h imunel wr6l. s/mpo; g30 m/s. (only fill in numerical value in the lr; : 2.nms .po 6wih/9nmlgueblanks)
(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 ah+plls28bgkq qto 9c /zpu+43 speed of 30.4 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what isbr,;r l9ut4u;l ayuz )psda- gxw+6v3 the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = j1 l,o41s umgqe g:5gx2.5 s?

  In Fig. below, what is the velocity (9 rcovz5a av/47dge-ij;e:g +sccde at t = 4.0 s?

  In Fig. below, what is the velocity at t =r js1e;sfz*5.c6rnn n ub/m ;f 5.5 s?

  In Fig. below, what is the average veltp1vmq jv)8a2ocity from 0 to 4.0 s?

  In Fig. below, what is the averagi47 dnm18k f+dg syc.y0tvy+we velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration 24qhlgeiv ge7f1e, d4 at 1.0 s?

  In Fig. below, what is the accele(fi6n s1td+qb- *whueration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to jdbc382 uqrvpc84- gx5.0 s?

  In Fig. below, what is the average accelern6/hk pe0: nbration from 0 to 8.0 s?

  In Fig. below, what is the displacement froe2-.gbqqh)qug3cyizxc6g7 u4hv) b7m 0 to 8.0 s?

Does a car speedometer measure speedp 9zj zd( fzopapj7dfx/5r g :q-+*)ky, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constant. 9 hglya/sk6ho 6(vj:k

  The velocity of an object can be negative when its acceleratirj.i+jy9aiu myuz1 fp5 g189zon is positive.

  If one object has a gr 9lr jv0ek;b,reater speed than a second object, the first must have a greater accr v0rk9,;jel beleration.

  Two cars emerge sidenms-s1 ( pa(le by side from a tunnel. Car 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 a+dwavw,vwqc1+z *+egy z1gw s0-a-xucceleration decreases.

  A baseball player hits a foul ball st.vc-g.z*f,-ssccxp q raight up into the air. It leaves the bat wp,c*.c-sx-fszc.gq v ith a speed 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 ,h2u( h5haarnapp;y.3ml 1hurc0 me 4to its acceleration, how does it change if air friction is ig.0haa cpu4ml ren12h(;hrup 3yhm5 ,a nored?

  As a freely falling object speeds upd:pvj , e-lm ,r(xspf;, what is happening to its acceleration, how does it change if air frics-v:pxdm,ej p lf,(; rtion CAN NOT be ignored?

  An object that is thrown vertically upwaru)wjqc cp5qw m5 4d2h;d will return to its original position with the same speed as it had initially uqp; c qwd4c) 5hjw2m5if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the s kb) w;89(c- tdubkjsqame time.

  An object can have nonzero vng*84mztf h x/elocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops alonj0 mci0a5l mo5r8*h p:q/s ahpg the wacj : 8 /p0*piolaqh sa5mhm5r0y has zero acceleration all the time.

  A rolling ball movesx 5b8zdsb5em. 8;u yao from $x_1=3.3 \mathrm{~cm}$ to $x_2=-8.3 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. 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 $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ 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 qu/x e,b8w- )du q)zozux2o cx2yarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.6 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 lij+pb 20uc+ ewo()j, 3*zvpewfib ui:t ozif;, ne, moving 101 m away in 8.2 s. It then turns abruptly and :jepij)+zeotp3, *z u, 2wcv;iofbw0bf u+(igallops halfway back in 4.6 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 fromezh0juv bn0. o2l4cyah d-x1. $11 \; m/s$ to $23 \; m/s$ in 5.8 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 zfl 9 0ulx*,d1u3br sy$18 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ai, b6:tnl 7:kra fbqduj7u2 3a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essent-lt0ed zl/ymia q+w9y a(r 0f7ially top speed aboutq 9ld(0 7+/ytref ailmy0a wz- $11.4 \; m/s$ in the first 11.8 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 a9ch6c 50vc gvu speed of $16 \; m/s$ to rest in 4.70 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves t*4+oww ;b 6afywtsd s.dzi)nr-3 tl8skid marks 92 m long on the highway. Assuming a decelefbaiw)t* tsn s+r 43d.otdlyw-86 wz;ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go 6zek+4:*p mogrdt.ria y 86kding $25 \; m/s$ 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 compled 5nxs4a6,0p *vmb kxite the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then acceleratkv0x46aimdxn ,b *p5se at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$