Suppose that an object travels from one point in space to ankm0z)4 qczji*1mq ol 8other. Make a comparison betweomm0 4k) i z1*jlzqq8cen the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity?:5arnam chbj9es9 y0 amn21t 4

  A new car manufacturer advertises that their car can go "from zero to sixtmr ) ):krr2myzy in 8 s". This is a description or2) k rr)zmy:mf

  An object moving in the +x axis experiences an accelerkfb (brnpei*1- 1ci c1ation of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directions,4m6iae 8q sn) begins to slow down as it approaches a traffic light. Make a statement concerning its acc aes,s84qmni 6eleration.

  Suppose that a car traveling to the We1bzy+rdcur8vs: )w/ yst (-x direction) begins to slow down as it approaches a traffic light. Make a statywv/br dzy ucs1+ r:)8ement concerning its acceleration.

  Suppose that an object 4qr jmgy.9 cwo093zhnywg 3.y is moving with a constant velocity. Make a statement concerning its mr3 cw z.3ggyyj onw9h9yq 40.acceleration.

  If the velocity of an object is zero, do29jqu-m1i uslunmh( g alb0.7es it mean that the acceleration is zero? Supportnia1l-u.uju l(m09m72 gh bqs your answer with an example.

  Can an object's velocity change direction when its acceleration is const9gkckwy (al. *ant? Sup g9*lwc.y k(akport your answer with an example.

  Suppose that an object is moving with cnsm8fqd73d zikmy+pvwc 36- +onstant acceleration. Make a statement concerning its motion with respect tc3+vk iwmm6q7+ 3fpydd-nz8 so time.

  Can an object have ib m w9 n/bg.f8:ovx6eencreasing speed while its acceleration is decreasing? Support your 8 meneb/v xo:.gw96bfanswer with an example.

  Suppose a can, after an initial kick, movep 2qe o87y8vlos up along a smooth hill of ice. Make a statement c8oey 7lo8qp2voncerning its acceleration.

  Under what condition is averagu4,5gx id 2t4sghlri7e velocity equal to the average of the object's initial and ,g ugdi4txrl4s 5i h27final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Howqd(nlf2myh5lfk4f sk6:z )ggln4 *.r ever, object A accelerates for twice the time as object B. What is the ( gr.snmzn 4fdf *k5kllyfq )24h6 :lgfinal speed of object A compared to that of object B?

  Objects A and B both start from rest. Th*mtddli28p kq6 6s4czny mla 7i.xg34ey both accelerate at the same rate. However, object A accelerates for twi.dpx 67dq*i lg6z3i4cl kny4 t2sma8mce the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is relek p1b+ jj2v:ok 8tjx4eased from rest and falls in the absence of friction, which:potxb 4 21j+j kv8kej of the following is true concerning its motion?

  When an object is released from rest and f; lj 95kgfc6htalls in the absence of friction, which of theg6 jkft c5lh;9 following is true concerning its motion?

  Suppose a ball is thrown strr792wnr80dks nkoyu ;m 2bin9aight up. Make a statement about the velocity and the acceleration when the ball reaches the hir28 nonksud b7i0w2;k9mn 9ryghest point.

  Suppose a ball is thrown straight up. What is its accelegfcw3s -5scugpw4 l5pb; qy46ration just before it reaches its highq5w3blw gc5 psgfyu46p4s-; cest point?

  Suppose a ball is thrown strwm (0yx(+ yy9;tc rkqbaight up, reaches a maximum height, then falls to its initial height. Make a statement amc;yytwy 0kr9 x(qb(+bout the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximuv(/o /ta(;g7 o ( wif6kvvhn /jgplv1dm height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration asv/1(kjg;l vv76ago(tdvpf / hwoi/(n the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resi hfh4 ,-dkg,cystance. Make a statement concerning hyh-,4f,gdck its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Whatsc vkn ;9cz5u;s z,7wm odq+.g is her acceleration when sd 5;gon9kq s+; wcv .sz7,mzcuhe she reaches terminal velocity?

  A ball is thrown vertically upward v 6kimet jimku 2b *xg*;q.p*0/ d4bedwith a speed v. An identical 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 t. ig d40*dbumx*kp*2t6; ke/ bvqeij mhe 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 la0az h; yxc+8wwter, ball B is dropped from the same building. As time progresses, tzah8 y+wwc 0;xhe distance between them

  Ball A is dropped from the top of a building. One second l;o1cvvb -ji6 nater, ball B is dropped from the same building. As time progresses, the difference in n ;oij1b6v-v ctheir speeds

  Two objects are thrown from the top of a tall bui4i2v2bvqtvn 0r4/sh p lding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when t 2qnv4sp/b v vr24hi0they hit the street?

  A brick is dropped from the top of a building. A second brick u8c( mcqcw 2g0is thrown straight down from the same buildicgqw( ccum 802ng. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with con( vs 2m/meej.hstant non-zero velocity in the +x axis. The position vere.e( mv/ 2shjmsus time graph of this object is

  An object is moving with constoy8h:+ so2 qorant non-zero acceleration in the +x axis. The positysq+r8:hoo 2 oion versus time graph of this object is

  An object is moving with constant non-zero veloc5ixvle;h;jmn l 8+j:c ity in the +x axis. The velocity versus time graph of this ocljmi5x8:;e; n hv+jl bject is

  An object is moving w9x;x )epfhlh-ith constant non-zero acceleration in the +x axis. The velocitp fl 9e-hxhx;)y versus time graph of this object is

  The slope of a position versus time graph giz.irxc4 f 5m)u.b +bluk;u of(ves

  The slope of a veloc0xkc1 k orr l5urgcl2h2dy40d2sbw9:ity versus time graph gives

  The area under a curve in an acceleration versus time graph ejgwcnqt6(ln - /9q+qgives

  The area under a curve in a velocity versus time graph37uchhc8 u3hsfug7v.jpk y + 1 gives

  If the position versus time graph of an object is a horizontal linew w62df(0q( ljsl xa,a, the object ia2llaq,jfw60( xd( ws s

  If the position versus time graph of an object is a vertical line, the lo*;8r emsam(chl0 b.+ujo: k object isamsc :0 b *8.rouljm(oh; e+lk

  If the velocity versus time graph of an object is a horizo:gb ly 53:joxvntal line, the object is:5golb3x y:jv

  If the velocity versx0+0hzpgxleyp yfdsc9q:a 213.i q 0/jx txb-us time graph of an object is a straight line making an angle of 30 degrees/x0ex - 0:t0bg2i9.qjxcqhf sdppl3x+y azy 1 with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distaoeb e ke91uop)b;,o(ance traveled and the magnitude o obb()91ua ee,kop;oe f the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12yj-9:qes w :gr /x-xn dc+-fwm km upstream in a river -n:gqsmxwfyr jxc -:+/ d9w-eflowing 6.0 km/h?

  55 mi/h is how many m/s? (1lm6bog 2,op4b kv ;4o e.bbk8y mi = 1609 m)

  What must be your average speed in oy .qvu7nr(fg z.4gkd-rder to travel 350 km in 5.15 h?

  A runner ran the marathon (app p ktp .z/i6 6mt.yz8grwh(bf;roximately 42.0 km) in 2 hours and 57 min. What is the average speed of fz kg6zt/ i6 m.(;wt b8pp.hyrthe runner in m/s?

  A car travels 90 km/h. How long does it take 8wo7pz u mw4-4fsmeh ct.c kx3t3,l;efor it to travel 400 km?

  A ly (light year) is the diyg4 f1pab/d /0em() xt d,ihfhstance that light travels in one year. The speed of light xhd 0i)emf/y, f1g4/b hpa(dt 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 q0y5fe6sl u bcx 4w 1e*b*x)bfbm +z9droad and you look to the side for 4.0 s, h)xbz5ybxs6dbflq04 c 9eeu *b1wm* +fow far do you travel during this inattentive period?

  If you run a complete loop around an outdoor trac5yjj l.1wy ubw5.rao0 k (400 m), in 100 s, your average velocity y0r1l.wj5jo.au5w byis

  A polar bear starts at th9-j/8x4 asyx-qtxebi e North Pole. It 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 4q xxesi/x8- 9-tjaybmin. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km swf(xs4/kpf+rlg(z z -outh, then 1.0 km east, thz- (l wxf4f p(gs+zk/ren 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 velocity?

  You are driving home on a weekend from schoo7rai:+ 4 a5 bg(wvutnll at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours anau t7abn(4gwvr +i:5l d 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 25bgd,j3 :n x;awbasf km/h. What is the average speed of the motorist for this trgabw nbdj3,x 2a:5s; fip?

  A motorist travels for 3z(pcwzmv+7vgf-6 mmka d90b (.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the(cv fk70m9zdmpv w+6a-z( bgm trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/,vd bgy.*bxx:ts7s / sh north for 750 miles. :/bg7tsdysx ,x*.bs vWhat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for2jot7y*gp ;gm 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 7m;p2 *y tgjgothe 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 aif*5/mvpgy 4z0ga -l nnd comes to a stop after 12 s. The car's average velocity during deceleration was 76 km/h. What was the car's deceleration while s lg-0ayvn54/ zfgmpi*lowing down?

  An airplane increases its speed from 100 m/s twc0 8(mrjk gld7au b91o 160 m/s, at the average rate of lmgaj7(k w1 8 rcu9db0$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerat y )bzy;dc+ +7d wd-h*rv kf7x*enw1sces 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 a/vnk6ps 8 *5akqk tg5jccelerates 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 thenzgdcp 7 im(4p8 speeds up with a constant acceleration ofp8p( dg7mi4zc $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocityikrah q/8v3.pz 9 usm7 8pvs7p of 2.7 m/s experiences a constant acceleration of mi rh89z k 8p7sa3u7qp/s.v vp$3.5 \; m/s^2$. What is the cart's displacement during the first 9.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed ,fx;bs v9 u,swof 483 m/s strikes w9sb; ,vsf ,uxa sandbag and penetrates a distance of 55.64 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 carrier. It 7ma/l.c7wyyc reaches a spycw.l7c7yam /eed of 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 accel.exz wu(. lfl-eration 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 is its average ac8 r-zdy-ddrx -ced-dxrr- z d8-yleration?

  An object starts from rest and undergoes unifo6c tn7/hmre)k rm acceleration. During the first second it travels 9.5 m. How far will it travel during the third sekn6h /cm7 )tercond?

  An object is moving in a straight line with constant acceleration. Initialgy ffbet8cxv0r 8a )*8ly it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during8gav*tyx0ecb) f8fr8 this time?

  A car starts from rest and accelerates unif,h b:rp(vzv 6pormly 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 deceldm/5wowrx1 3mgw )e-lerate 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 ,t mrmc-w bgb 5uvik6n+*wnguc.g-+; that has been waiting at the intersection starts ;-g++uk *cb6i.rtbcg, m - 5nwgvumwnahead 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 m/s on the surfa6f7 ohfbw d gyder 7wdp36rt+9s2c6p(ce of planet X where73p6wo ctf6ded wr s7 (gbdr 6y+p2fh9 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 r j-cyvo )h6 tbawb+,5with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is c+,b or)hayv-wj56tb$1.5 \; m/s^2$. 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 or, 4 q+pyi,n,nxcb j2wn the surface of planet X where the acceleration due to ni 2xj,cr4ywb,np+ q,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 14r/ky:ev8bn i2 t.1*b ec og(jq m/s on the surface of planet X where the acceleration due to grk/:1 o2jqev bc (n8.egytr*ib avity 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 lf 4g8e ko3*brfriend holds a ruler between your l*b3 ger f8ko4fingers 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.po/pz 99+ 5srvs*7l3bq gxcxc6 m/s. What is its velocity after 3.00 s lsgcx/vr b+px3* qo9c7sp z59?

  A bullet shot straight up returns to its starting point im;o5 ceb9sl ;sn 4 s. What is the initial speed ;smesbo 9 5;clof the bullet?

  A ball is thrown str3 *)w(0(2 vb)seojgk2 oywitt lhwyl9 aight up with a speed of 36.0 m/s. How long does it take to return to its starting poioil wj02(9g two yte() wvhk y*)32lbsnt?

  A ball is thrown downward from the top of a buildine ;x qitpq c/k,a r:d*0tk5n,og with an initial speed of 19 m/s. It strikes the ground after 1.6 s p/,o *n; kcd tqti0:karx5eq,. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical va+atz/bwfsv 8/ lue in the blanks8/zst vbwfa+/ )
(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 sti8 j.w )qph8vr.6nb3hxs t1z zraight up into the air with a speed of 33.1 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 velocity at t =i)m/1bsoqd bp) 48nhv 1.0 s?

  In Fig. below, what is the veloc:gwohxo 07uw;b .8+ib)ohz ipity at t = 2.5 s?

  In Fig. below, what is the velocity at t mfq9*w uf e7,t(pg hawyqt 4a8s *47o/lmhq;g= 4.0 s?

  In Fig. below, what is h w0wnty5y:y kb.04 stthe velocity at t = 5.5 s?

  In Fig. below, what is the average veloczh6g/l+y 1x phity from 0 to 4.0 s?

  In Fig. below, what is the average veltmh7-thv5d y-ocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration3cf7bqkic7w p8 :k4s r at 1.0 s?

  In Fig. below, what is oj13 lt);g lisc,* b)6vwvoq:1nh sftthe acceleration at 3.0 s?

  In Fig. below, what is the avewu )q/0)u8(s;fj;g j5 r t ehyveud8uprage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration fr i*pp i fcqj(-l2gwd9 e/9pub9s40 7 zr4yufwiom 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 /qo9 (oq*tm6j3 z1)tvtmn 7m umvt/trs?

Does a car speedometer measure speed, velocity? {sp ( ypf8c9d 4kge9*lt8eb)pc qpeed|velocity}

  An object can have a varying speed if its velocity is y5hsd s9dk*h uf9 6g8kconstant.

  The velocity of an object can be negative when u l+humi26(eys91i w2odd 5awits acceleration is positive.

  If one object has a greater speed than a second object, the tydg6)u8l358cmkhs u first must have a greatdck )t6l 8u8uhg3sym5er acceleration.

  Two cars emerge side by side from a2l1gzc rqnki g1w7w7li.z4 5 w 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 speeeo+ 3,xg yej5ed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It l n(nw8xn i.d;* bs.vuneaves the bat with a snv8n;is( . d unn.xbw*peed 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,xrc h4 *gyx 0znme-dbofj.9. 6 j:e3sn what is happening to its acceleration, how does it change if aixm 4szc9x6edny .hg.o*-jbrj efn30:r friction is ignored?

  As a freely falling object speeds up, what is ha/- bbpg*gf:of ppening to its acceleration, how does it change if air friction g/gob-b f:*pf CAN NOT be ignored?

  An object that is thrown vertically upward will return to its ora69 lj4yl,gzhhh /1zkiginal position with the same speed as it had initially if air resistance is neglihgl1z64yjz9 / a,klh hgible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity :86y:j zlwsv 4hcab hzi)4p/ ovj m0s e8z*b;hand nonzero acceleration at the same time.

  An object can have nonzero ztt,u3 a3,7(5jeic6upt ec y nvelocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making n-o/, ltcro7 tgo stops along the way has zero accele/t- t,7olcorg ration all the time.

  A rolling ball moves fros0(lq zwhgdriq:t(6voilp52:0w d q*m $x_1=2.5 \mathrm{~cm}$ to $x_2=-4.4 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps,g jvxtc6qm +h a,h:-r around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.5 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 88 m away9 :a ze.squl )6+ijfui in 9.5 s. It then turns aq9j)uui :i z6s. fe+labruptly and gallops halfway back in 4.7 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 fr/ 7i,s1d xxwgaom $13 \; m/s$ to $23 \; m/s$ in 4.1 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 8p +p5:.q ukkp 4chrn:qf9 g eoe+wgo4$21 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spkryueme-/:w4b 5hh a.25 tm fbeed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst oufa7l +l f2 uv5/pn-pl lz+lqq5t of the blocks to essentially top speed abou-lqlfu5 v/27q lfa l5+nl+zpp t $11.2 \; m/s$ in the first 14.8 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 unige*q,47v vicy13 *agewoh j c7formly from a speed of $17 \; m/s$ to rest in 5.06 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on acfm.iux g:,u5 dkx8h8//+- p pzjpn nthe highway. Assuming a decelerajm +au/ x5. zpf x:8pi -cn/dghu8np,ktion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goixxrdlw/uf.3 syqe2h jng:7et9 o/ + y7ng $25 \; m/s$ 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 exactl8nt83jwvj k( vy 27.0 min, there are still 1100 m to go. The runner must then acwt8(j v8k3 vnjcelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$