Suppose that an object trakk9f itb-,j /xkr+ pz9vels from one point in space to another. Make a comparison between the i9r+tfpx/ zjkk,-bk9displacement and the distance traveled.

  When is the average velocitgbc72 ac ,wic9y of an object equal to the instantaneous velocity?

  A new car manufacturer adv-q yfh v.ii 3)tcfa;3vertises that their car can go "from zero to sixty in 8 s". This is a .3ifva -; v)h3f iqcytdescription of

  An object moving in the +x axis experizy zg3c(l4w68rry/ 0 n cev;jcences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Eaylz40 qbo/3 ep6nnt ,yst (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.py,60zyqle3/ n nob4t

  Suppose that a car traveling to th869mmzbvi l,ge West (-x direction) begins to slow down as it approaches a traffic light. Make a statemen,z9l6bm i8vmg t concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Makedy6s,x.lu wki u7-r8s1 f a3jt a statement concerning its accelerasr k7.,-wt ls81fu6j x3iudyation.

  If the velocity of an object is zero, does it mean that t v. 9ckfav xe9+6nafy6he acceleration is zero? Support your answer with an 6 xfke9fa9vya6+vcn.example.

  Can an object's velocity change direction when its acceleratq y9)wyq6xbdbx x.48hbqlx 2(ion is constant? Support your a x6lh(qw4bb2 xy.) 8qqbxx y9dnswer with an example.

  Suppose that an object is moving with constant acceleration. Make a ss ,0sr(hx8o+g :pvo5ek vzc* vtatement concerning its motion wrv8:oz*v0 x,( gsspvcoke +h 5ith respect to time.

  Can an object have increasing8vm;dd.hrt-6o yo.f9wh9 svu speed while its acceleration is decreasing? Support your ans dfoo.mut9-;w r.sy6v 8hhdv9wer with an example.

  Suppose a can, after an iniuq(t ;(lgply /+bd t(mtial kick, moves up along a smooth hill of ice. Make a statemep(udy /lmtt( +q(gbl;nt concerning its acceleration.

  Under what condition is average velocity equal to the average of the object's i8i(02nvjugwg /tymt5q)m7e tus-6 gbnitial and final velocit)yt 02-gb(/7ugttueg6nw qismv jm58 y?

  Objects A and B both start at rest. xoqn to8 u4-x,They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the 8 o 4,xnu-otqxfinal speed of object A compared to that of object B?

  Objects A and B both start from rest. Thx su w/:8twaa*ey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to thatwuws8aa/ tx*: of object B?

  When an object is releh fggy--6,dlnased from rest and falls in the absence of friction, which of the following is trulgg- - d,h6fnye concerning its motion?

  When an object is released from rest and i l4r6 m+sx3fifalls in the absence of friction, which of the follow+xmfrls43 i6i ing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity a xu8 jtw,)s43jcjd 2band the acceleration when the ball reaches the highesta3 d,8ct2w) sj4xb ujj point.

  Suppose a ball is th4.t0yngl js7 rrown straight up. What is its acceleration just before it reaches its hig 0st 4jrn7.glyhest point?

  Suppose a ball is thrown straig.b9os4qzx ct a6e06;dz;q aup ht up, reaches a maximum height, then falls to its initialda ;69zt ;szauq0xeo.cp 4 q6b height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to itb wq)lgarm;l3p*;/s;se / cy ps initial height. Make a statement about the direction of th3p*e /mgrl;; /qb l)wpsc;s yae velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown do*ac+vw1 h ptlr7fh0/cwnward in the absence of air resistance. Make a statement c clvht 10*p/+h7rcfawoncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wdc+c m6)roq d+hat is her acceleration when she she reaches termiom+dccqd)6r + nal velocity?

  A ball is thrown verticallh: 9to50 ycptgy upward with 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 the first ball? (How many c5ogytt hp 0:9times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buildibp;yu .jx/)q c-f z+lv- wlek.ng. One second later, ball B is dropped from the same building. As ti-w.vquj k )z-llx +ybe;p cf/.me progresses, the distance between them

  Ball A is dropped from the toccmv r 98)f7d;g5mmmpp of a building. One second later, ball B is dropped from the same buc v57rgm8mp 9)mc ;fdmilding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buildinf c:i+qjv as75g. One is thrown up, and the other is tcv qa:fsji57 +hrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brirmk- 1t9 4 +(wpmpih3fdx ad (kq(az1uck is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compw-az k m(mf1pxq (d d94ut3hp(ik1+raare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positionvg:ll-tm*y0o l1ah, x vyotlml-g,l a0h* :vx 1ersus time graph of this object is

  An object is moving with cons dr), h :b2hel-vpg,ghtant non-zero acceleration in the +x axis. The position v)eg, p2v- rh hblhd,:gersus time graph of this object is

  An object is moving with constant 4 zwb7zh;uby(mc1 f d;3s 8bxdnon-zero velocity in the +x axis. The velocity versfzwdbd 1 h3y 47cxzmu;bb(s8;us time graph of this object is

  An object is moving wiii a)9h+cc;y motf 4(ath constant non-zero acceleration in the +x axis. The veloci() ah 4ictif;c+9my aoty versus time graph of this object is

  The slope of a positios).a9upog+f9 d u nin,n versus time graph gives

  The slope of a velocity versus time graph givey*kmx5s*mwimu y)7 pi1g 9+ )gjw mt*ws

  The area under a curve in an acceleration ve s7f6z9 elrjd7rsus time graph gives

  The area under a curve in (3jkwrx wkg;60 e9pp0 2bwm wla velocity versus time graph gives

  If the position versus time gr (a.+mra b4wegaph of an object is a horizontal line, the object is.we(agb 4ar+m

  If the position versus time graph of an objectqt +t4ody;b/j is a vertical line, the object isqj 4o yt/dtb+;

  If the velocity versus time gr91ri 3y nx6sib: quel4aph of an object is a horizontal line, the object rq iebl 9y 3xs14ni6:uis

  If the velocity versus time graph of an object )e4vtf y8z/ g 28lguu16zqdniis a straight line making an angle og et1u dzfqg8i)8zvlun 6 /2y4f 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find bw6gly3k3pfaq 20b m,g oth the distance traveled and the magnitude of they23b6g0wgak , 3mplqf displacement vector.

  A boat can move at 30 km/h in still water. How l-; gp n*j.skshong will it take to move 12 km upstream in a rijn g.-hk;sp* sver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609dyoih61-.f n 4h2((tyftj6nm-wl 4phwrdla 9 m)

  What must be your average speed in order to travel 350 km in 5.19 * o h9ybkbzvpfkug3+tciw .kj 3r49+5 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 minymp s8 f c,2d9y66usib. What is the average speed of t2 mfss 9yu6by,8 6idpche runner in m/s?

  A car travels 90 km/h. How long does it take for 6/t4 pohva8sr5+dh ayit to travel 400 km?

  A ly (light year) is the distance that lig z(3fgzj u7)tm z8n1niht travels in one year. The speed of l1jzfgtnz) 783( mun izight 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 you look to the side e)o) m,b2yzpfkf +:k feu.l,nr4rr 2ofor 4.0 s, how far do you travel during this fu) r2+2m.bye 4 fn)r,lo,rk k: foezpinattentive period?

  If you run a complete h1) p z bi6+dx.dyzm*de0x oymn 3ref6k )-+afloop around an outdoor track (400 m), in 100 s, your average veloc3.+be m6drxxdi-kyf d )*1fp neho) 6azz 0+myity is

  A polar bear starts at the North Pole. It ep9c 4mzvu:-z 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. What cpzz vme-4u9: was the bear's average speed?

  A polar bear starts at the North Pole. It zf prg97tt nz2z e83h0travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to retr tez zp307 n9t8hzf2gurn 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 110-8w (709gxtbibpgg mr miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. Hg79gg- wr(0ipmxbt 8 bow far is your hometown from school?

  A motorist travels 160 km w gq:i3;z*6ht)5f olg e4cr paat 80 km/h and 160 km at 100 km/h. What is the average speed of th5*f:ziqpl hggra;3ow64e)ct e 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 he5ogizavi9 d +ln 0ee3/ ho -*sr5xem/mr average speedie/5oh+o/xmeda gi n*s3m-r90el5 z v for the trip?

  An airplane travels at /jo3,zi/2 )5hqsu 0t 2 mvxaurqph;to 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. 2q /ta )i s hmqot3o;/5uv2p rxjh0uz,What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person whq sei 0o eiv(t+2uu6-qo runs 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 hav2uso6 (+u 0iqe-v iteqe 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 cn)smkw )gl(,e d9a 7ouomes to a stop after 9 s. The car's average velocity during deceleration was 52 km/h. What was the car's decelerlu m9 dke7o (s)ga),wnation while slowing down?

  An airplane increases its speed from 7+q/iavt kn b/38wc .4 xylfrb100 m/s to 160 m/s, at the average rate of y fcnt /x a/3847qwvbril b.k+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acg ;zv3fchb5/n celerates 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 rew1 r vnh++og8vst and accelerates 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 1oguxr:*, qxqjy )4/v q0 s. It then speeds up with a constant accelerationxrqj4 )uq/gqy, oxv:* 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 3.3 m/s experiences a constant acb w9qfj+j6* vlgfl0 ,hi pgkdyo3 *y)+celeration ofy+i9bldg g p k+6 y)f* jq*f3whv0ol,j $4.3 \; m/s^2$. What is the cart's displacement during the first 4.1 s of its motion?

  A bullet moving horizontally to the right (+x directq2(k6zjo0 f btion) with a speed of 549 m/s strikes a sandbag and pene20tfq6j k(obztrates a distance of 34.71 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. I qd:d,sm7*2jvq y eril ri:ez2z-7r)zt reaches a z eq7vid* ,l j2emz7rd::r2qy-iz )srspeed 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 er3n5yb2xt- lx1kjm)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 ))hmetadru +t )+(sak 80 m/s in a distance of 200 m. What is its average acceleratio)kt+ )rs ea+(htm) duan?

  An object starts from g1s3 nfsjlgpf.l 3o,24rv p)x rest and undergoes uniform acceleration. During the first second it travels 2.4 m. ,o pjx g3p4f.f1 2gs) lsnrl3vHow far will it travel during the third second?

  An object is moving i0vug x(j3izts 5p4j2h n a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fa jtxus2z 5i0v phj43(gr does it move during this time?

  A car starts from rest and accletb1cqm mf.oaq 0 . -1cby t7y/:xfs;elerates 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 ab32g5t-rcif-fs1 ,15 uuimsvxfg2 cr aout $5.0 \; m/s^2$ 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, ak qe. 2b *acx iy8pys6;zmgt-nex)t1ko78: ti car that has been waiting at the intersection starts ahead with a constant accg.t8x6z eiyt cxi82;n tko)7s e: p*ab-1y kmqeleration 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 spwxsc; +9uq k.feed of 12 m/s on the surface of planet X where the acceleration due to gravity s qx9;+kc.fwuis $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward 1( (y+qsm is 4t,kwoo b*nmx)uwith a speed of 12 m/s on the surface of planet X where the accele *omk4ot)xqny( u(1iws ,ms+bration 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 t)boy*834nw6lly,mhi mi 1zu fhe surface of planet X where the acceleration due y b)yn ow,l*m31 iu4imzlf68 hto 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 surf/yq bc-6 fdn1pace of planet X where the acceleration f/yndq 6c-b1pdue 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 frik*r -bz1ngb /.m2p:tg b1fmckend holds a ruler between your fingers and releases it wimk1*b zpfmr: 1bcgkb/n .g 2t-thout warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward q.pru(cam0 nq /7at1hat a velocity of 19.6 m/s. What is its velocity after 3.0a0 (qram hcup./qn71t0 s?

  A bullet shot straight up returns to its stav xw z5c**xv*krting point in 16 s. What is the initial speed of thez xvcv*w*x*5 k bullet?

  A ball is thrown straight up with a speed o; ak80(f bfnaof 36.0 m/s. How long does it take to return to its sta ofn08f;(aabkrting point?

  A ball is thrown downward from the top of a building with an initial speed of 1g( atxqlbz7 effx.qjg3 )4(m+7 m/s. It strikes the ground after 6.9 s. How higlbqex m7(xz )q.3tg +j4faf(gh is the building?

  A ball is thrown straight up with a speed of 320 qip )ilr(hxff5)-bo) nb xp0 m/s. (only fill in numerical value in the blfbx hpl(fi ))i5 qr2) n0opb-xanks)
(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 air8p5 uuou-u1 gapuzf9b p 048:iyq(wcp with a speed of 26.3 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 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 is the velo( a:tt)n1a3; t + w:kzfhgbeaacity at t = 1.0 s?

  In Fig. below, what is the velocit yoj3,q)lmj;wvc3p ga-l o/ )my at t = 2.5 s?

  In Fig. below, what is the v(u2m q yvt*3eeelocity at t = 4.0 s?

  In Fig. below, what is the :n1i hutv6wxiao3k ulz*( 0j7velocity at t = 5.5 s?

  In Fig. below, what is the average aypxh k .92qe/velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6by6sl08e;- rg qg3j9b obwm+w.0 s?

  In Fig. below, what is the accelera0gt3 8 qfxnj/eon/u3 jtion at 1.0 s?

  In Fig. below, what is the acceleratiogb*q.; tt,4 lmny 7eiln at 3.0 s?

  In Fig. below, what is the average acceleration fr/ js,+b5 lcaw kqv+jli 9i15g7nnf+ttom 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s-:zyw 1fxfc nlb)q )9d?

  In Fig. below, what il+gp:ncy(94s)qh f rb s the displacement from 0 to 8.0 s?

Does a car speedometer measure speed,v ; mukrkkvxamg5 m+a32m./d:)9 xkv i velocity? {speed|velocity}

  An object can have a varying speed if its veloo8cd-x+s.w eoqbi 4h* city is constant.

  The velocity of an ob5a kvi4md:a9 b, /l3kiejess 9s /0rplject can be negative when its acceleration is positive.

  If one object has a greater speed than a second oao 63iccub ixorhu.8 ,2timht9):noov51 0igbject, the first must have a greater 6m 28iti9h: u.i cr3 )oo5o ia ,oxcntv1ub0hgacceleration.

  Two cars emerge side by side from a tunnel. Car A is b6iyn*uv2o r 36dc1 ,ml;mnoftraveling 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 dr:* k/mj+ 6tx q8xqk8sebz)qfecreases.

  A baseball player hits a foul ball straight up into the air. It leaves thes 5p0wlz n+rfr55kzk,q/0ijb vb18x g bat with a/n5jv bl, p80rwiz1f+55 k xqsrk bz0g 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 to its acceleration, ho9ozx/c7 uvv fni5;dqc k64ya)w does it change if air friction is nqk /vz oc; f7vd569)ixa ucy4ignored?

  As a freely falling obu6w,0(sq+p pst j me6fject speeds up, what is happening to its acceleration, how does it chanpe (t6+ j60 s,mquspfwge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to it+g bae+r*jwd3r o++ xds original position withaj+rbdx+deg +3+r o*w the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocit)qj kg,- tg-vls8s bq7nc+j o8y and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same v p8)g(d /2ki cmlehl1time.

  An elevator moving from the second floor 3y hy,m4/bnb hydm).z to the fifth floor making no stops along the way has zero acceleray dm. /zy )n3m4bhyhb,tion all the time.

  A rolling ball moves fp3ddvq47dyr t: um8 -drom $x_1=3.1 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ 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 complete laps around a quarter-mile zruikkcsm9*1l/+y:i ($1 \; mile = 1609 \; m$) track in a total time of 12.5 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 aeotcw9z 99i 3u straight line, moving 111 m away in 13.0 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its aver3we 99ct ou9ziage 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 gd54++g wfd7aahk ;vv $11 \; m/s$ to $24 \; m/s$ in 4.2 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 fro upb;f3 z-ru9 :hoj;xwi;8ekcm $22 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sznk8xgg+t41 speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst (j zc)b)0s zuz+*zdpv out of the blocks to essentially top speed about pzc)*0dj+zuv(zz ) bs$11.5 \; m/s$ in the first 13.9 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 dfr/r u22ho- pspeed of $19 \; m/s$ to rest in 4.83 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 the highway. Assumin8zcch0oqe -n;4 + wyxjnj)m- qg a deoc0jm y+h- qnc8) -4z;nxqwje celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g 5 7g2d+ijlxdj k pn/eq-sh(ah y2h/4u dy9xe8oing $25 \; m/s$ 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 exivg,*r dxd9h*actly 27.0 min, there are still 1100 m to go. The runner must then accelerat h,xd**9rvig de at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$