Suppose that an object travels from one poing9kzu)fsss+i48 6xr wt in space to another. Make a comparison between the displacement and the distance travel9izwks6sus f)4 8g+xred.

  When is the average velocity of an object equal to the intt n iuco (p)6-maar)(stantaneous velocity?

  A new car manufacturer advertises t4vl;m-4ez..aj , see)ja4 7w eiaqp qhhat their car can go "from zero to sixty in 8 s". Th) s.4aa-;paejwh.v qe ez l4m,i eqj74is is a description of

  An object moving in the +x axis experiences an accelx7m w2*uj5 ho l:dzhn7eration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling t4gmn0 6wknaye) m a, )z02whv e,4wdino the East (+x direction) begins to slow down as it approaches a traffic lig2aw)i,0dzwe0 )kmy,4mn4gev6 h nn aw ht. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directi/ +dpj)q3 mfmujfo9f *on) begins to slow down as it approaches a traffic light9qf+ fojp)mdf um/3*j. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constans 4jyg3f : api4pne/0.l+tqrht velocity. Make a statement concerning its accpg aq440tei.rf hp:l+/3jn syeleration.

  If the velocity of an object is zero, ddda6tl8da /7 hoes it mean that the acceleration is zero? Support yd 7th6 adl/a8dour answer with an example.

  Can an object's velocity change direction when its acceleratiow16,ukf,n 5q 5kew zks;:ko wpn is constant? Support your answer wi :1kq;,zweku 6 wo,55skp nfwkth an example.

  Suppose that an object is moving with constant acceleration. Make a sskb /i qm :vf/xa-1q;uz0c :ybtatement concerning it01i/ ms/ qyba:z;ck x:bvquf-s motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Suppope 3do8shh w;,2-rlgtyo.. ea rt your answer with an example.2-ho g8wo3 .tlae;d hy, psre.

  Suppose a can, after an initial kick, moves up dkwo vz;y :a7ei-b6+ oalong a smooth hill of ice. Make a statement concerning its acc o:k7ybeviw;-a+6zodeleration.

  Under what condition is average velocity equal to the oll :0ok;5 4ptbmb8 sfaverage of the object's initial and fi bbo ks 4l;:o50p8tmflnal velocity?

  Objects A and B both start at rest. They both accelerate abn3ho vq.d8i5 vps6)ekfp( - at the same rate. However, object A accelerates for twice the p6qvpse5 bv3a n .-(kdf8)ohitime as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. gz es.ec e0d)a ulhos1yc1 1988rg,px Hodsgyz8)ge10ecux 91 .hpl,r8sa o1 ecwever, 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 restf th/.v-rtz/ t3hmxh6 and falls in the absence of friction, which of the follovx/t-t.h3tz/ h 6rmf hwing is true concerning its motion?

  When an object is released from rest andp my *w9gl9ysv6tw 9l; falls in the absence of friction, which of the following is trt wvp9y*9 lms9wl ;yg6ue concerning its motion?

  Suppose a ball is thrown straight up. Make a st8dx9whi 3: / 2ydzfbweatement about the velocity and the acce/ 9 zdbdx8ewi:32 wfyhleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. ke5 b ug-)/do *hu(gfsWhat is its acceleration just before it rea uskb5(g e f*g-)/oudhches its highest point?

  Suppose a ball is thrown straight up, reaches a ma w0z d+jq(qla)ximum height, then falls to its initial height. Make a statement about the direction of the velocitya0z (dql)qj+ w and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then v lnmndhy 8jiat-//8ad 5 h3v8falls to its initial height. Make a statement about the direction o-/3dn8/ya8v d5lhamhv 8 jint f the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downwardm- 50ag3ru3v7ygr2dm n tbp*p in the absence of air resistance. Make a statement concerning its acceleratio vgy0 733rm-tpb*pm5rdu nga 2n.

  Suppose a skydiver jumps from a high-flying plane. What is he(a727of t/d0wbfdn5 cr c0srxr acceleration when she she reaches terminal veloci r7xfc0dbw 27 /stc0(ora5dn fty?

  A ball is thrown vertically upward with a speed v. An identical second ball is f1 .9gavz9h valtezyxvr1 ;m61oi/.u 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 1ugft1zzoel;vvrm 9.ay1 x6/9ai h.vthe second ball go than the first ball?)

  Ball A is dropped from the top of a building. hapk x )4nnhn(9sm*5iOne second later, ball B is dropped from the same building. Akn4im)xph na(h*95 nss time progresses, the distance between them

  Ball A is dropped from the top of a buildk to0r ,cy7b(hing. One second later, ball B is dropped from the same (tkyo h, 0rbc7building. As time progresses, the difference in their speeds

  Two objects are thrown from the top ofs56wyg(af2 ht a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hya sw56f (2gthit the street?

  A brick is dropped from the top of a building. A second brick is thrown s1om rjs)6;ob etraight down from the same building. They are released at the 6smob;)1 je rosame time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the teypsh i ovf *o,.o 63k+hhn33+x axis. The position versus time graph of this object i33hi 6htyo*h+sk,e 3ov.o f nps

  An object is moving with constant non-zero accefzo/g6v :o:x0ljop( f leration in the +x axis. The positiovx jlp0(o 6f:g /:ozfon versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x a0v.a* b.ejc blad*ke. xis. The velocity versus tacb*d.l e0vbj.ea * k.ime graph of this object is

  An object is moving with c xbte1j 1 y1 .vywo/67x5kiiiponstant non-zero acceleration in the +x axis. The velocity versus time graph of this o1w/t y 6e1xi 5i.jbpx1o 7ykivbject is

  The slope of a position versus time graphg 1o8bt0 r:2j4 fe 11kwlxykui gives

  The slope of a velocity versus time6e2ikk6(wp1dmb d adyi;:8,d qld- cn graph gives

  The area under a curve in an acceleration ver9oemwe 6 6nf ekjg0u h6k.135xn7pyj isus time graph gives

  The area under a curve in a velocity versus bsebp3a2o:w(r 1tc+ jgu gez /8mn3y1time graph gives

  If the position versus time gra:ur og2a z1brjw0it 6,qbx/cd / np-e9ph of an object is a horizontal line, the object 91-/u e:atj,r dnq gbxi2cpow rb/z60 is

  If the position versk(:p fomd(n h1us time graph of an object is a vertical line, the object is :d1o(f(pnkhm

  If the velocity versus time graph of an object is a horqz19aq0fb3q xw 9 d2zt+q,fi iizontal line, the object i3qqafwiz9b ,xzq+ 91tfid02qs

  If the velocity versus time gr7;1 fxdq;4m+yek mztwaph of an object is a straight line making an angle of 30 degrees w z 17mk;exfwtq;y +4dmith the time axis, the object is

  An object moves 15.0 m north and then 11. q-zcshr-9 )j eh3-tmc0 m south. Find both the distance traveled and the magnitude-9 cs3c m--hj)rthzqe of the displacement vector.

  A boat can move at 30q ha 0v+w e+1 k,ixqrx,o)2ji) elo+iq km/h in still water. How long will it take to move 12 km upstream in a river,o +i+qx)e)ivw j+ oeq rih,0kxlaq12 flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16l3bw v2q gb6s hgop6,109 m)

  What must be your average speed in order to trave x-lf1in6ij.m8 w0aedmm vy/::- spvyl 350 km in 5.15 h?

  A runner ran the marathon (appro(;1s(n:xjorau m 3su3bfp8 r iximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/aojr b33;(s :funm r1xu(8isp s?

  A car travels 90 km/h. How long does it take for it to travel rb8ah1 ph):z8 :mc.m)aqeu:lp)ho sjn b9 0nv400 km?

  A ly (light year) is the dg8o8 vqi0 bv 8yt/mer*istance that light travels in one year. The speed of lighgmbt8 *8 e8ryvq0/viot 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/z /cujt4jw( ii898xmoh along a straight road and you look to the side for 4.0 s, how far do you travel dut/um98 z (ji84ioj wxcring this inattentive period?

  If you run a complete loop around an outdoor track (40xa;m6)ffkh,y+kd9ftw/ 1 tg g0 m), in 100 s, your average velocity i , ;+ )wa1kfmkx6gygt9htf/dfs

  A polar bear starts at the North Pole. It travels 1.0 km south, then 12e )fta0q q -5pl(u bcv;mq0mk.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. p)u5b0at2 0 vfeqmq( kq;mlc- This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. 5w meoy:mn0o ,1w1cqa )a ;zvwIt travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. Whacm,1voe) o w 5nyma1a0;wzq:w t was the bear's average velocity?

  You are driving home on a weekend from schooelkq cn(mg +2;l at 55 mi/h for 110 miles. It then starts tm(l ek+qg2 nc;o snow 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 kmn-y r0ytd0d 8w at 80 km/h and 160 km at 100 km/h. What is the average speed of d0-yrwydn8t0 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 isy oj-:b58, dryimml-pyws3p; her average speed for the triy js:,dom 3iw-y rl -ppy;5m8bp?

  An airplane travels 91p95te puaff at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. Whetf 9pauf 591pat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 1m.e- b pgyj*u(.me. qa00 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 thu m.. b-( yjeqgpea.m*e 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 uniforv b,a4l0gr20cslcm-xn sb x+ari,9) i mly and comes to a stop after 12 s. The car's average velocity during deceleration was 56 km/h. What was the car'slvsx n,ci),m4s-9aa b0lcb2 ri r+x 0g deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 16,nu )ctf r+-lv0 m/s, at the average rate of lv,rtu fnc-)+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at tha;j9wv 2ew/ z+n xbj)ze 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 accelerate /4v6y yp,xyb;qa e4lds 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 10vd zl/nig-4hb gq859ympj 9:f s. It then speeds up with a constant acceleration qg z5 im4:hbj-v8p d lf9n9/ygof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.6 m/s experyomb,:dn+h3 xc*1pxz iences a constant acceleration of m,x1 ch:o3*dynb+zxp $4.0 \; m/s^2$. What is the cart's displacement during the first 9.4 s of its motion?

  A bullet moving horizontally to the right (+x directio4pp*2n;rnxu 0 xmz y/qn) with a speed of 282 m/s strikes a sandbag and penetrates a distance of 75.85 cm. What is the aver;0nz x m* 4p/nyr2uqxpage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraftt e)/ry62huqail y 6+l carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration2ey6/ +)yll u6ir tqah is constant, what is the length of the catapult?

  A car starting from r,x 4 gumwk04ri h/fi4hest moves 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 200 m. What h32 netl;-gv cv-m,bo is its average accelet-ovg e- l 3v2b,cmh;nration?

  An object starts from rest andpp*) 0 ; j7kihytzwpc: undergoes uniform acceleration. During the first second it travcj0i)ppw :k7 p tz*;yhels 5.5 m. How far will it travel during the third second?

  An object is moving in a straight line with co6 x 6axgo kcuqe(l):p3p3 dfr*nstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does ipalx (f3 x6qec 36gdru*k op):t move during this time?

  A car starts from rest bwr9 m3wqd *,*,bl.knqpjdl)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 on a dry road can decelerate at abouq1r 3wb8aza z.t $5.0 \; m/s^2$ 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 gt0z7y,eg dqh2dgy ,l,k8/ i hlreen, a car that has been waiting at the intersection starts ahead with a constant acceleration o,ytly/78g,h2li d,ehq zkg 0 df $2.00 \; m/s^2$. 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 upw7kku 6guz,0)uh.n 6xd 7 wxmt.zf vlg0ard with a speed of 12 m/s on the surface of planet X where the acceleration dugu0wu6, kf znut6 7 z)x.vg.x 0mhld7ke to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a-ql :zxu.svo,4t -if t speed of 12 m/s on the surface of planet X where the acceleration due to-v.ts4ui z:fq,tx- ol 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 theb hk ixlt2b:sn 9:; 1j.qy8ouw surface of planet X where th yuw lhqo.s :2bxi89bjnk1: t;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 a speed of 14 m/s on the surface op/1rx hdzb-7a es/8h ib.q.juf planet X where the accelerat/.i-h.s 8qh7 jprxd eubz1 /abion 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 friend holds b f.9 7cn/ipkea ruler between your fingers and releases /ef. nb7 ikcp9it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velo.k- w8w0e1gqpv g rabakgg9yvu 72 ;je/m2c+acity of 19.6 m/s. What is its velocity after 3.00gkbmvaa7 wrvep2 qaek+82-g. g ; yg/1cwu 0j9 s?

  A bullet shot straight up returns to its starting po7rhzs2h qg1;j int in 13 s. What is the initial spes7;zhgqrj 2h 1ed of the bullet?

  A ball is thrown straight up with a speed of 36ii.i *y c (j65unvci)c.0 m/s. How long does it take to ret56c j )i. c*ivi(niyucurn to its starting point?

  A ball is thrown downward from the top of a building witftabo: k07 qc4u bu/7th an initial speed of 21 m/s. It strikes the ground after 3.8 s. How high is u04u fkctbbq:to7/a7the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numekkbgp( .w3 a,lrical value in the bgkkp3 (a,bw.l 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 straighdt+n: c83kyxr1j qi /pt up into the air with a speed of 41.6 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1 pk.v3,xfoyf 1.0 s?

  In Fig. below, what is the velocity at t *rb ar jl45bu*dsm+o/+ 2fkrl = 2.5 s?

  In Fig. below, what is the velocity at t =ei(1rt.y; ai )ujjq;j 4.0 s?

  In Fig. below, what is thcujzl;;z qgme*eg(9( e velocity at t = 5.5 s?

  In Fig. below, what is the average veloc*l o2o 28o49ovpwu ))nj-; k9 dttz8savsnxb mity from 0 to 4.0 s?

  In Fig. below, what i;tayi)mrl t3g ,cu lqh,i8u w; i9/6pys the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acp 5ge ewv3jn60celeration at 1.0 s?

  In Fig. below, what is the accelerat * m)ukx pccgo2xv(e.)ion at 3.0 s?

  In Fig. below, what is the average acceleration fro e*-re, oal-gfm 0 to 5.0 s?

  In Fig. below, what is the average acceleratio45w pxnb qfn l:wln-2(n from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to43 o;dg recra8o+c1as 8.0 s?

Does a car speedometer measure speed, velocitqo8 ip-6-v sdfy? {speed|velocity}

  An object can have a sud- a(gnb/ e)varying speed if its velocity is constant.

  The velocity of an object can be negative when its acceler k,0zshr rlc3)ation is positive.

  If one object has a greater speed than a second object, thzred4 -13zjsre first must have a greater azs er41rdzj-3cceleration.

  Two cars emerge side by side from a tunnel. Car5;l9pfahy s 5c 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 acceleration decy+ 7 izdz7 :dcl6c*epwreases.

  A baseball player hits a foul ball straight up into the air. It leaves the baqyh 61(:cjs; n +ngrodt with a q6: 1hoc;(+ ndynjg srspeed 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 objew5 fu dsf*,9fqct speeds up, what is happening to its acceleration, how does it change if air frif,qf5fs 9ud w*ction is ignored?

  As a freely falling objectwnj92p tq,lm + speeds up, what is happening to its acceleration, how does it,wp j9nqm2 lt+ change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original 5u+kd1w vf/psposition with the same speed as i+/dv 1k5 upsfwt 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 accel *vu-g p6 ,o0nlq,bqpweration at the same time.

  An object can have nonzero velocity and zero acceleration at the same time55nmphc6a o s7.

  An elevator moving from the secondk(ctr3 ;5x ofb floor to the fifth floor making no stops along the way has zero acceleractfr; o3 5k(xbtion all the time.

  A rolling ball moves from,hhr;itq / m /vrkr/1s6wv to) $x_1=2.5 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ 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 $t_1=-2.8 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundkpw bpij5 dja6- /md4h)eq ax*-b +y;u a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.7 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:7akn2svd,fzg54t.evb9 g jv line, moving 102 m away in 11.3 s. It thf7k:dzveng,bjt. a9 5v2s4gv en turns abruptly and gallops halfway back in 4.8 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 froww-+em1xu2u r+hn x i8m $13 \; m/s$ to $25 \; m/s$ in 4.5 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 wup dfr1:jt8h/ ssu-9$19 \; m/s$ to rest in a distance of 81 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachw-pqfnm2/u*9 s,hq vv a speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out ofo+j6. ezxvagpcj .qd8 9/s o ubamd,+8 the blocks to essentially top speed aboup8.qd6. xez+gm/ d+ uocjj8sa,vb a9 ot $10.0 \; m/s$ in the first 13.8 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 a speedzc:kx u2 weuv 0;*a alp;0k,qg of $18 \; m/s$ to rest in 5.63 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mark+3 r96n3ii:w.dt v 2g*zqfklfxnni5b s 92 m long on the highway. Assuming a deceleration rgn+z vb.itl nxinfdf* 9i236 w:5k3qof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckjj hs/lanr 4.v z30q/b 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. After 56,*(hk amlvxzq5 8i-z fmnf cexactly 27.0 min, there are still 1100 m to go. Thezml k q56mn,a5*(izvxfh-8cf runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$