Suppose that an object tl3p:vc) dv/*qmiq7 g4pqigf2a -ad3g ravels from one point in space to another. Make a compar)va a7d 3*iq4pqvpcmdl 2igf/gg-q:3ison between the displacement and the distance traveled.

  When is the average velfsm2,v 45ylw vh fv:a-ocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 89ji+01c(d0j ,d hqleln zn)re u7 4fmm s". Thidz0m(deln+j)h4in,f qmu cre7 91lj0 s is a description of

  An object moving in the +x axup5gj .ezv (kf* ;1ug bog4wss14u 5knis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car trav kh*fe*u )tfl,vxpb;v732lunr3x )woeling to the East (+x direction) begins to slow down as it approaches a traffic light. Ma uxf3p b)n;w etxf2)vr,v37 lukl*h o*ke a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) beginss-o o)3w k 2cjwzg-xz6 to slow down as it approaches a traffic light. Make a statement concerning itszo3--czsj w2okg xw)6 acceleration.

  Suppose that an object is moving with a constant velocity. Maks j+ fsu+lcl:*e a statement con+ c+lfusj:s*lcerning its acceleration.

  If the velocity of an object is zero, does it mean that the accelerati)w;ylamr1a: n 9fqp ji9s4g4gon is zero? Support your i;1 p asm99)f4y4q alggjnw:ranswer with an example.

  Can an object's velocity c zjt0i7pwu 3+6oqjb)yhange direction when its acceleration is constant? Support your answer w3otz6 bui7p+y0j) j qwith an example.

  Suppose that an object is mo*u2fuv5*v, my, c gnncving with constant acceleration. Make a statement concerning its m v5, nvu*,2gcfunc *myotion with respect to time.

  Can an object have increasing s za,eet(: (rbe)qt 6zfpeed while its acceleration is decreasing? Support yo6:te, (ztreb (qze f)aur answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hbwiw75 v o;jsdn/af r,4 8zaaky:cg52ill of ice. Make a statement concerw4s5, vgbd27i yw:o aarjfnacz 8k;/5ning its acceleration.

  Under what condition is ;t. ,+t faajndrxuksm6-js39 average velocity equal to the average of the object's initial and final velocitysa dxr9-6af;+,3k .jtmju tns?

  Objects A and B both start at rest. They both accelerate at u5n4/bysvxf - the same rate. However, object A accelerates for twice the time as objec4vy xfsn 5/b-ut 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. )f p4pehc q:rgtv:3v+ However, object A accelerates for twice the time as object f :3p )vcqhr:+4vt egpB. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in c *otghm ejts1d:-fb2ixg1 gxm(+s3:the absence of friction, which of the following is true concerning its motion? m2m(j i3fc1sgdgh:1:+ *txxeb-osgt

  When an object is released from rest and falls in the absence of friction, whici)hfooy4fj 7:h of the following is true conce:i 4hofyj )7ofrning its motion?

  Suppose a ball is thrown straight up. Make a statemk kqsdj v7z0rq8q41l 0ent about the velocity and the acceleration when the ball reaches the highskvdq01 470j kr8ql zqest point.

  Suppose a ball is thrown straight up. What is its accelerationvrb7d-i),cu x just before it reaches its highexc,r v-d7)iu bst point?

  Suppose a ball is thrown strau/i7a *r/v7psx y7uxfight up, reaches a maximum height, then falls to its initial height. Make a st//xy uarxv7up77fi*satement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, t v*.t9len/gyuu8 kiv -hen falls to its initial height. Make a statement about the direction of the velocity and acc8y/utge*kvv l .nu -9ieleration as the ball is coming down.

  Suppose a ball is thrown downward in the afr4abhkx- 5a4bsence of air resistance. Make a statement cxr kba-ha 4f54oncerning its acceleration.

  Suppose a skydiver jumps from a high-flying 38n8v+ atf+xkdvdte3 r t-m9vr 5rhs6plane. What is her acceleration when she she reaches +t-e 8dd9+3f8vk t3nr t5ramxr6 vshvterminal velocity?

  A ball is thrown vertically upward with a speed v. An b bblw.;++lm,j3zyxhl2mn-f identical second ball is thrown upward witbmb nyz+fh blx- l+l.m32 ,;wjh 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 the second ball go than the first ball?)

  Ball A is dropped from the top of-q,xhkx+8swrmjtf 82c, sk* ge s7c5n a building. One second later, ball B is dropped from the same building. As time progresses, the distanc,2fsx qk+we8jcgs 5sn*t-,8xch m7 kre between them

  Ball A is dropped from the top of a bpfn7cc7jf2 p -upe/ cy1(ni*ouilding. One second later, ball B is dropped from the same building. As time progresses, the difference in their sppu7cenjo f(c n7/ ic1*2fp-ypeeds

  Two objects are thrown from the top of a tall building. One is thrown up, aj. -xk :8gwirand the other is thrown down, both with the same initial speed. What are-k j.rx 8:iawg their speeds when they hit the street?

  A brick is dropped from the top of a building. A serrg-: -t1tt zjcond brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare t: t1rt-zrt -jghe accelerations of the two bricks.

  An object is moving with con4tcsl-ap +v y;,p 6ryestant non-zero velocity in the +x axis. The position versus time graph of this object y;l+r,e -c4ta6pp yvsis

  An object is moving with constant non-zero ac; , k-ampqmp/+kxjt bzj)7tiez(,np +celeration in the +x axis. The position versus time graph of this objeap jjmmbk7kztn,z+( pi-)pxt + e;/, qct is

  An object is moving with constanyt,;hfpy;w ok a133nkt non-zero velocity in the +x axis. The velocity versus tipoyy;t;1 an3 hk3kfw, me graph of this object is

  An object is moving with constant lp/laplti:2fnm 7yd7e1 74u knon-zero acceleration in the +x axis. The velocity versus time graph of 7ul/ 2d47f mnplaip1tk e y:l7this object is

  The slope of a position versus time graph7:5gvple/8 gbbuj14puz p 5z q gives

  The slope of a velocity versus time z o ne-;r34io(a2xgbigraph gives

  The area under a curve in an acceleration versus time graph g1)f -8gaesdg r6zlc jz:mao;3)pgx8v ives

  The area under a curve in a ve1b .pw;z *gthjlocity versus time graph gives

  If the position versus time graph of an object isucf wxd5d) r/; a horizontal line, the object ifxd r5) w/duc;s

  If the position vershf,qb4.n(lif us time graph of an object is a vertical line, the object isfhf .4nil(bq ,

  If the velocity versus time grakf5 wy nd0e;j3ph of an object is a horizontal line, the object isf k3e0dn;w y5j

  If the velocity versus times ise+)h.h 5npq ru6u9 graph of an object is a straight line making an angle of 30 degrees with tr5) s6hui.p+9e hu nqshe time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find5 ywsb*j(k;x778ksva: q.w dvhrdj8 w both the distance traveled and the mw*7k:yxb;8dw5 sa.jwvv8q k (hsr7djagnitude of the displacement vector.

  A boat can move at 30 km/h in still water. a,unupz1-9acp h l 3g) How long will it take to move 12 km upstream in a river flog9),u a- cuapzlp3h1n wing 6.0 km/h?

  55 mi/h is how many m/s? (k)k/xv0 j)-ujtqya iilf8b*8 1 mi = 1609 m)

  What must be your avera .hdtg0d/w, c/, ab:uryn q:cpge speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximatt.b, /jzcblazk3ui:7ln h 7e1ely 42.0 km) in 2 hours and 57 min. What ih, ulj7 ib:/zkcbatn 7ze.l13 s the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 kj:++aok ) se/ z/zrthro /ey.ym?

  A ly (light year) is the distance that light travy1ia4 i9.q+xx pdlts5els in one year. The speed of light i .5dsi y4l+9i1qxxtaps $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/ y+ 1n7qikvdf/b ;,b rrq7qv7afn f*,ah along a straight road and you look to the side for 4.0 s, ho 7 r +,/f dv,afvq;bbaiqk*r7q71n nyfw far do you travel during this inattentive period?

  If you run a complete loop around zr;5+dh/ knfgan outdoor track (400 m), in 100 s, your averag/rgf+nkd5hz ;e velocity is

  A polar bear starts at the North Pole. It travels 1.0 km+w8j,; 5 bhly) pk4;kbe jvmhc 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 ,jvcb5; pjy)kw +hk ;b8ml4 he45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km so) +ov i3,zzfo3o,gwu iuth, then 1.0 km east, then 1.0 km north, then 1.0 km west to , v gwf3)ozio, zoi3u+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-.yhvfu 5v 5; 3(lwn ydabgyo. for 110 miles. It then starts to snow and you slow to 35 mi/h. You arr5( ;dlav f .vwyn- 5uho3gyy.bive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h anm-fqz +ql6 a5yd 160 km at 100 km/h. What is the average speed of the motori-ayqm+ qf65 zlst for this trip?

  A motorist travels for 3.0 h at 80 km/h jlbvwpii.gi t:lj-l9+z /7 jm 3jb3* oand 2.0 h at 100 km/h. What is her average speed for thejjtbvo jl-j+/z mi.39gil73 wpbli *: trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mgn.appfi65 r /m4d:ck e6ws7ei/h north for 750 miles. What is the as.k6prw de /:7e4mapn f5g 6icverage speed for the trip?

  In a 400-m relay race the anchorman (the person who 7- cb8ock/qn3c.fgh1x y gd)eruns 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 c8x d1gkf3ngyh ./)c7b e-o qcB 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 aj;yl;87fxcjdc0 u 16.gjzdb t nd comes to a stop after 11 s. The car's average velocity during deceleration was 73 km/h. Whl;.dfcdzj1 ;tjxc0jg b6 7y8u at was the car's deceleration while slowing down?

  An airplane increases its spy:/4ym xkevj-co. ,yzeed from 100 m/s to 160 m/s, at the average rate of cjyo v/- yz.ykx4me:, $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratec,+ef n5di)vm3q1 v kgjn6ca41rq-pps 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 acceleratx-,u j:unyo4 jr,2y (jo u3vxves 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 then spms r)4:nun0t9il5 +:vmuz yleeeds up with a constant acceleration ofm)tevius0y+u n zm 9l::n54lr $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.9 m/s experienrn oy1u+wt u8b:sk7b +ces a constant acceleration of y 1s nbr7bwouu +kt+8:$3.7 \; m/s^2$. What is the cart's displacement during the first 5.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speex0xts iosmgr 4,.9 /uad of 291 m/s 0ts9s xr/ .ix gaum,4ostrikes a sandbag and penetrates a distance of 87.44 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircrh,7jz *ylhy *caft carrier. It reaches a speed of 42 m/s at7ylh, *y*jhcz 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 conlf-*nluk)1 yes eb1 l:stant 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 sp0p3lue9ka)zq*v , oijsa89in a distance of 200 m. What is its average acceleration u80ka*)z3e ijopq9,9as slpv?

  An object starts from rest and undermiltq.77h/ y q( hu7lbtx5oyc8ow;g .goes uniform acceleration. During the first second it travels 7.1 m. How far will it tra o5y.hw qql8x/y; (gb7.i7c thtmlu7ovel during the third second?

  An object is moving in a straight line d1yxzec2s4/m 2ap:rcwith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling 21:/r cae2 zycmspd4xat 10 m/s. How far does it move during this time?

  A car starts from rest and afgr 6ycoists7 e)n4j30kb9// -vst vwccelerates 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 decele:v3zzrtut6 ;jj. tl z4rate 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 turn 0t0ork:xgug, s green, a car that has been waiting at the intersection starts ahead wu oxr,g: t0kg0ith 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 surfa io;ps27h0 /(gup jeghce of planet X where the ejshu0(2p;ig/g p7 h oacceleration 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 of 12 m/s on(eiyb e k3sk3- the surface of planet X where the acceleration due3k k y(s-bi3ee 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 wimnnl n8h-k1 c,th a speed of 15 m/s on the surface of planet X where hn,-ln1n km8cthe 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 wi8bdc4z84df gtej+rb-:0jzdb i:; zp ath a speed of 14 m/s on the surface of planet X where the acceleration due to gravi4zb4az t fb::zj j ;cdde8dgb8i0+r-pty 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 holdsvgy ;zkr28 8qeiip6g3y 1b+um a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catchig1m p;6ky8e 3r+qu2izy8b vg it?

  A ball is thrown upward at a velocity of 19.6 s 8:bu+ytoq2n m/s. What is its velocity after 3.00 b8y +:sqnt o2us?

  A bullet shot straight up returns to its starting point in 15 s. What 8 ay.)x t 4r k/)iegh;bv(lxgwis the initial speed of th.8 rakil4(;yxg)xhtw eb)g /ve bullet?

  A ball is thrown strbg2jnyr2 ) h bfpl1e/ 1h*qieoq2 8+ulaight up with a speed of 36.0 m/s. How long does it take to return to its startinp)2 8lyj1nuho lq2 hfeq+r/ gbebi 2*1g point?

  A ball is thrown downward from the top of a building with an initial sx/v rfqf2 0e2t+hgqb, +j 4rsxpeed of 29 m/s. It strikes the ground aft xrv2f2rxbt0j/s+,e +h qgf4qer 1.2 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nume2uhfe,mh4l c.rical value in the bl.4fh mul,2ehc 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 of 35.5 mdkoik0v)3 .qj/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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = r5+j a upu+9 zpaop62iks y+9vqr b06x1.0 s?

  In Fig. below, what is the velocn0byec4s0h5f5v. a f(k 1leaw ity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 t9xdo3v4o) l5i( kx (qmkgnv1s?

  In Fig. below, what is the velocity at t = 5.5 svuc4y)4dv im. ?

  In Fig. below, what is the average v+t*m /caen1y zom9wn+elocity from 0 to 4.0 s?

  In Fig. below, what is the average velo ;bl6ytyg1 yt3*g7k im.u+nz in8nql.city from 0 to 6.0 s?

  In Fig. below, what i+c8 pdei n +anqs*ei90)0 bzmvs the acceleration at 1.0 s?

  In Fig. below, what is th-bk:k )ml;byj s5q7lw e acceleration at 3.0 s?

  In Fig. below, what is the a9p3qkr1fof 5u verage acceleration from 0 to 5.0 s?

  In Fig. below, what iq .cla;e:pinb9. xkge w(:nf-s the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from scyv2w-2 1 eao0 to 8.0 s?

Does a car speedometer measurac)n,(qs q+(xmeup (z e speed, velocity? {speed|velocity}

  An object can have a varying speed if its veloci97 jwny 2v2ovm:bm)kr ty is constant.

  The velocity of an objer9s n47qmz 1me h.prx6ct can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the firstvwm6 :)y.j:qpnxp1b v must have a greater accelerationwp )b.vj6x1vqm yp: :n.

  Two cars emerge side by side from a tung,9hr h/gukz w 8;/kqwnel. 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 acceleration dec6du06c ibqw 5ireases.

  A baseball player hits a foul ball straight up intmqpd kj x3+ .ozt tpi)g+,x,8jo the air. It leaves the bat witzki.,,o xjd tjp)mxq+3 g tp+8h 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 towkhm unf,h5(1 9bshj + its acceleration, how does it change ikuj+f9w h,1 nm5sh (bhf air friction is ignored?

  As a freely falling object speeds up, what is happenw1w*3rw hz rjmya0c t ho20;n+ing to its acceleration, how does it change if air friction CAN NOT 13 awmcoh wj;nwtrr0*y 2+z0 hbe ignored?

  An object that is thrown ++5qtur cea+k7x.po v,c1ijovertically upward will return to its original position with the same speed as it had initially if air resistance is ne c1vc7uok rajpo.5 q ,+ei+t+xgligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero ad3deg/5c ay0f cceleration at the same time.

  An object can have nonzero velocity and zero p j;eqc )rt/y no8/1raiu,o7uacceleration at the same time.

  An elevator moving from the second floor to the fifth floorqn9rs zgn; dma ,)1o .hipzs;riz+l-7 making no stops along -in.iq z)+ md szo9sa;7rg n;1lz pr,hthe way has zero acceleration all the time.

  A rolling ball moves frogd8vwp9 pa:f l-1t4nym $x_1=3.3 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ 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 $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mxna b* zp.k.2yjfe 42eile ($1 \; mile = 1609 \; m$) track in a total time of 7.0 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 0x zj,5zfxr.* jw+mf j96 m away in 12.1 s. It then turns abruptly and gallops halfway back in 4.7 s. Cal z5xw j,r+f0f j*.mjzxculate (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 froat3 i:cs8;o1h)0 dfy sjs9aza m $13 \; m/s$ to $24 \; m/s$ in 5.2 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 from hcxqs 0( wc*yb2km6hjh r)j72$21 \; m/s$ to rest in a distance of 56 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spk+ chwgw2 )pw0eed of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essenti7zqzst w *(/7 xnwtdh*ally top speed about w/ x * zt7qsn7hdtw(z*$10.3 \; m/s$ in the first 14.7 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 uniformly74 w ok:m7hdaf from a speed of $16 \; m/s$ to rest in 5.59 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 befg, 5q ix2a/highway. Assuming a,xbf age/q 52i deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin mlu7 3e5mum rue)nd9)alb25. 5etl vqg $25 \; m/s$ 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 comp.py11cgj m; apnuy6s.lete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The rmn a6gp yju11c.s.py;unner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$