Suppose that an object travels from one point in space to another. Ma2k;,4ktvmc 0gcn1vh 0 .a 4idscx;stske a comparison between the displ4 kdm2gvct;4c.c;v0i hka,0snxs1ts acement and the distance traveled.

  When is the average velocity of an obj0jvnlg 1* li77p wa;uwect equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "fqihhtm 989 s+o0:iz3-v xchafrom zero to sixty in 8 s". This is a description ofsi8:xa-hhm9 vqh+c30ot9 zif

  An object moving in the +x axis experiences an acceleramz) *scj; a:vae3u h+ution of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow dvgfm a(+ r26gpown as it approaches a traffic light. Make a statement concern 2avf (grg6+mping its acceleration.

  Suppose that a car traveling to the West (-x dib)c poga3w:z/rection) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. )bz/gw3caop:

  Suppose that an object is moving with a constant velocity. Make a statement 1 :grni2ml z+:9 dri 2nhyvz(rconcer il2i(vr: + 2yrzh1:gzrn mn9dning its acceleration.

  If the velocity of an object is zero, does it mean that the accelerati rq;r/i198dxdi+qb1i vxn +knon is zero? Supp1 1r+kd vbid ;qnx /q8i+n9rxiort your answer with an example.

  Can an object's velocity cha, du6nx.hbse fd ptsu5o6e8c7tu, *cg;x +5ywnge direction when its acceleration is constant? Support your answer wiw hx5;8ebe*c5,upsdgxyt7 ,fc .+n 6ouuds 6tth an example.

  Suppose that an object i;i ueh4xw bw9vzy):5h s moving with constant acceleration. Make a statement conc hx4w5 h;izy9:u b)weverning its motion with respect to time.

  Can an object have increasing speed while its accelerbuwz2: e n:a5iation is decreasing? Support your answer witui2enwbz a: 5:h an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Ma/w-:qth2l e.uv p-qdfke a statemevq2e wlqu d t-.:/f-phnt concerning its acceleration.

  Under what condition is average velocity equal to za 8 :kapl7c*hthe average of the object's inith8a apl 7z:ck*ial and final velocity?

  Objects A and B both start at rest. They ics -uj55/wy6e c8reaboth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of rjie86u/ 5ccye-w as 5object A compared to that of object B?

  Objects A and B both start from rest. They both acc+zck) z6 eri8wb lcb6;elerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance travicr+z8z; )6wclk beb6eled by object A compared to that of object B?

  When an object is released from rest and falls in the absence w+6waz(ixm moe (l 71) gkjzn0of friction, whichzx onkww)0zm7e i6 (g(+ mal1j of the following is true concerning its motion?

  When an object is released from rest and falls in the a73thu1 hgf ui.7;olyjbsence of friction, which of th7uu oj13hf;igt h7l.ye following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a stateex-;k 8yq4 vwsc/+fub ment about the velocity and the acceleration when the ball reaches the hi ;f/bekuq sw4v8xy-+c ghest point.

  Suppose a ball is thrown straigqn/0lvz:z i(w ht up. What is its acceleration just before it reaches iv(0z/:in lwqz ts highest point?

  Suppose a ball is thrown straight up, m,l 9luk9msvi z35wt.obrm(5 reaches a maximum height, then falls to its5sr5mlbtzi( o v, 9w k9mmu3l. initial 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 fa gbk9kbrck9b cl8(;g/lls to its initial height. Makkbb kg8;(/bl99gck cre a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistau/+ zxaruj:2yp:zp0 rnce. Make a statement concerning i:0z pzu/rpry 2+ujxa:ts acceleration.

  Suppose a skydiver jumps froob7rk7 , a8gkh p-,:xlb6ia rnm a high-flying plane. What is her acceleration when she she reaches termiknk7pba6io8grra:,b l x - ,h7nal velocity?

  A ball is thrown vertically upycy *0x pnf8j3s9to;r5e(: ,g ocw txpward 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 tipor9(gc0:w j 8x,5 *ofpyc;x ent3ystmes higher does the second ball go than the first ball?)

  Ball A is dropped from the top of awn.po:tnd9* f building. One second later, ball B is dropped from the same building. As time progresses, tn.t:p wd9nof*he distance between them

  Ball A is dropped from the top khs4 ,l2wn*1rammc q2of a building. One second later, ball B is dropped from the same building. As time progresse *krmqc1h2s4w,anl m 2s, the difference in their speeds

  Two objects are thrown from the top of a tallh ddhz8u7sza cna-e3y-;8 4d k building. One is thrown up, and the other is thrown down, both cd84-;ezhnd3 au8as dz7-k yhwith the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from thefu*tlx :h (letd-2 v+m top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelemelv2h d(x+*fttl-:u rations of the two bricks.

  An object is moving with cor-l5vy: xy6p:xvl8d p7nrq;oe xf r: 3nstant non-zero velocity in the +x axis. The position versus tivl5p qo:xr3 -r; yx:y xfpn7r:l8d6evme graph of this object is

  An object is moving with constant non-zero ; s suom-ipt;8f -0l,xwv pzi/acceleration in the +x axis. The position versus time graph of this obji/lfp spo-u ;vtz ,x8mws -i;0ect is

  An object is moving with constant non-zero velocity in the +x axis. The v5. 2yq oektptg,l6m5 aelocity versus time graph of this o,5te.2mo k6atp ly5 qgbject is

  An object is moving wj4lh9,d4pw hoge08 x bith constant non-zero acceleration in the +x axis. The velocity versus time graph edo44,8jbl p gxw0h9 hof this object is

  The slope of a position versus ti.g 7yo5yqe;gf me graph gives

  The slope of a velocity versus timewpa7pw s0-rb8 graph gives

  The area under a curve in an acceleration versus 2ysh -ir,u0 lvtime graph gives

  The area under a curve in a vel (ac0t.r ng:mlt,xym*ocity versus time graph gives

  If the position versus time graph of an ob b*yb73g, aeatnkrv( 5ject is a horizontal line, the object 7bvny ka53,*gare ( btis

  If the position versus time osx 97msjg2, sgraph of an object is a vertical line, the object is9 7ms2jsgos,x

  If the velocity versus time graph of an object is a horizontal line, the objm ,sprt kfa :t)4thbh* 8: gu6tg+9tmlect i ftmpm*l, t6ht r:bk+ 48:tsth)g9 augs

  If the velocity versus time graph of an object is a straight line map. d sq-oh 2nx+m-2z,ccc)f pzking an angle of 30 degrees wdc- zmo, fnxc)pqhpsc .2 2z+-ith the time axis, the object is

  An object moves 15.0 mth) 3zr6y zgxak( j 7knvx)8-z north and then 11.0 m south. Find both the distance traveled and the magnitude of the displacemeax8 )vg6z ztn)k3zrh- y jx(7knt vector.

  A boat can move at 30 km/h in still water. How long will it take t rr36tyvv6usk,3i2ywo move 12 km upstream in a river flowing 6.0 km v,23s6u6 y i3krrwvty/h?

  55 mi/h is how many m/s? (1xvz5xl e;upv g4 /x,t4 mi = 1609 m)

  What must be your average -b weuxyvpm4f mbbx/e)5;) ,i speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (a+e higbduy yr6z,6if6;w2 hc+pproximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner 6+hy wy er26ibu,c +h dzgif;6in m/s?

  A car travels 90 km/h. How long does it take for it to trn.eu+h t7a8 f -net-jwceax5 .avel 400 km?

  A ly (light year) is the distance that light travels in one yv1agilm 9s; ,nku: 7qlear. The speed of lil1s,v7m liu;a:q9gnk ght 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 strac2w4k w9 5octiight road and you look to the side for 4.0 s, how far do you travel during t4 ck coi92w5wthis inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s,-x n)g8lqhi +w your average velocity is8hg w)x n+-ilq

  A polar bear starts at the North Pole. It travels 1(*riifvj)* r o8f :zfj9oauq5.0 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 was (r) i*rf5ufqioz 9*vjo:j8 afthe bear's average speed?

  A polar bear starts at the North rzlnjz -6qx) 3Pole. 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 zjq6xr )n 3-lzmin. What was the bear's average velocity?

  You are driving home on a weekend from school a uxy8jk7dn- 7 jpk+lk-9dzq p/t 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 and 15y/d 7jk9q+l7u-j-npzk dp8k x minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Weziw - qy5lbc*)z1s) vhat is the average speed of the motoqyzvs b iz*c-wl 15))erist for this trip?

  A motorist travels fo2vm yw:y6qbz( r 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the triy 6z(y b:mqwv2p?

  An airplane travels at 300 mi/h south for 2.0 7n/ ks2r5 sp z*qf3mum.9mof6bla5oc0 h and then at 250 mi/h north for 750 miles. What is the average speed ols9zbr.q/ c653 of7*nmm5 sa2mk fup for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) fo5q+ai/houwp m c 0p5+yr team A cayho pmc5q5au w+/ ip0+n 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 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 comes0ajfp+ rpfopp na29fehfby9 32 *a*5-ib*pw v to a stop after 13 s. The car's average velocity during deceleration was 7 9vaf3 0y2a-h 2bo p9ewfjf+ pib*af*nrpp5p*8 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 the averdpjt6/b cn+f m.stq i v.nt;84ag:f 1vage rate of 4/mpcvbf ;: .1.qds+8jtt6 vntnaig f$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rat.il:zr ktb/)i e 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 accelera nl5 2y2lkfnh1tes 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 for3 e+mumx ua;)e 10 s. It then speeds up with a constant acceleration o;+muue x)mae3 f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity o5mw fr2t0xd+p1pih7mf 6.4 m/s experiences a constant acceleration of+d5hx7m fwp i12 mp0rt $1.5 \; m/s^2$. What is the cart's displacement during the first 5.9 s of its motion?

  A bullet moving horizontally to the right (+x diy a7nc4k vd:j) 2 e s6ji/x/n*ceehw3rrection) with a speed of 590 m/s strikes a sandbag and penetra4)awnhex /y7sir 6:k23je *cdjnc ve/tes a distance of 10.21 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 z smo(*rv ;zuoa * bs1n4rd6hd 1(/fdlreaches a speed of 42 m/s at the end of the catapult, and this reqdd14(s v ahol(z**fr bd16usr;mon z/uires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rykj q9 1vmh4csu(- y.west 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. Whawsbi9jdq *c,u ; xou(4t is its average acce*d;xbo ciqu4 u9jw(s, leration?

  An object starts from rest and undergoes uniform a:vu.9 mspb lsg+f0 +sacceleration. During the first second it traf+b0 :sgm.ps9v+ul s avels 8.7 m. How far will it travel during the third second?

  An object is moving in a straigh8n6*wfc -gzinu1ee 8ht line with constant acceleration. Initially it is wzec 8 i*6n-nfu18g ehtraveling at 16 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 acceleyuudbd(3 *ls;g- ws/srates 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 a:fuhlz2w911gv rap4r 4.wlz fbout $5.0 \; m/s^2$ 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 that has be m)a teiml io8b;j)nun s(z98+en waiting at the intersection sii8a 9m)+ ; mej)ounzbnlt(s 8tarts 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 ; l5kgvlen,k onwe .(g0nav 2:of 12 m/s on the surface of planet X where voel:(w;k.l5a n,n v0nke2gg 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 with a z/qfeo 9ma7deni. +0huti y:4 speed of 12 m/s on the surface of planet X where the acch.ui:dn/ +9etieofz4yqam07 eleration 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 axow13w * *phkv speed of 15 m/s on the surface of planet X where the acceleration *ohw3k*1x wpv 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 speug(8f.h f6u .nuhtg6z ed of 14 m/s on the surface of planet X where the acceleration due toh g..f fu6t8nuu6(ghz 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 a rr23u2qs if*xn4,upog uler between your fingers and releap fo,r2*gusu3x 2iq4nses it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward/.r -,vh:y uj/argh-n1x zufo at a velocity of 19.6 m/s. What is its velocity after 3.00 s1-y:gozh.r x uv f r-ajn,uh//?

  A bullet shot straight up returns to its starting point in 17 s. Wsv :w3a 60r/v jhdytt3+kv4 hfhat is the initial speed 6/j:d ytkh v0 v3rhwf+sva34tof the bullet?

  A ball is thrown straight up with a speed of z:0a) hcw ue q4.siuc+v;l4bm36.0 m/s. How long does it take to return to zuchas:i l)4m4we 0vu;.q +bcits starting point?

  A ball is thrown downward o2enaw dzp9eskj.7v.7 77f zu from the top of a building with an initial speed of 6 m/s. It strikes the ground after 3.9 s. How high is the buiow nza9e dpv77j7ze..s27 uk flding?

  A ball is thrown straight upd 87i:i/;fn br/ ppmuy with a speed of 30 m/s. (only fill in numerical value in bi:;p7/ ny pd8/ruimfthe blanks)
(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 straiyu 22s6i,ug gka-u *bp c(;hhjght up into the air with a speed of 40.8 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity atifs5 mcbaj sbm06 )1ign) ow 307a(gsy t = 1.0 s?

  In Fig. below, what is the p;j4 mru j(z1svelocity at t = 2.5 s?

  In Fig. below, what i+*f 3 af gwx,pu*va-wps the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s:kc; m6x la dfbue1r 1thz8,0o?

  In Fig. below, what is the average vxm8m y 3kzk 9-3:yhotmelocity from 0 to 4.0 s?

  In Fig. below, what is the average velocie.q3 r o 106du)ypsfxo 0gz5boty from 0 to 6.0 s?

  In Fig. below, what is the*fhuy ysr:o o5cj(5m; acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3g(mmr-cl6.kn uw; y3m .0 s?

  In Fig. below, what is the average acceleratio,d jxu3b9 fdp7n from 0 to 5.0 s?

  In Fig. below, what is 2 fv 6 d)0 n t++e*9i0gvzvbbosr1wjxythe average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 se9qo --5 ly 15du*btbm hw9suc?

Does a car speedometer measure speb d rfs2rbq s c0 4+z*pprf36pht-4xb+ed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is consa44qb9tnx8-/hl g/* 0 sry ifzf i-knptant.

  The velocity of an object can be ne3 cm t-hvy-s)sjo,.i.hv mmj1gative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must havs x6j pa0(x-jte a greaterp(j6-0 t jxsax acceleration.

  Two cars emerge side by side fromtrx lr0o t ja(,vx1 63-s4ktmp 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 acceleration debd.gu0fjn o6 c 4zti3qk9*0cg creases.

  A baseball player hits a foul ball straigkhd2 u+b be5:rht up into the air. It leaves the bat with a spee: e52hb +rdukbd 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 objex:5mk,4 e( z5sxua :3zbnyosa ct speeds up, what is happening to its acceleration, how does it change if ai5zx eym35n :bo: ,4 asuz(kxsar friction is ignored?

  As a freely falling object speeds up, what is happening to itieb1/ zgai1 z3 9go1i z5ho7jli1yf(vs acceleration, how does it cha11j yg o/9 fog5iib1izaelz3hiz 71v(nge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its v37d-/j gdagaoriginal position with the same spee/d7 dajv -ag3gd 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 velocity and nonzero acceleration at th 6nd-oig) qk3m*h4yjre same time.

  An object can have nonzero4lw-wd* qcvte. :k7sa velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor maka;y no7 l k5*pbs4rzglvms+*)ing no stops along the way has zero acceleratiolbm s 7*rlk5p)go na4s yv;z+*n all the time.

  A rolling ball moves l rvo.c57lhst0l; ir( from $x_1=2.9 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ 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 $t_1=-4.7 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete p v o.3gqr/u95 c7f6q7hy lxdclaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.2 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 cgl) od*u*+qbq7 r2is gd cj6.a straight line, moving 111 m away in 10.4 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its au db*+i)rjd.l 6g 2q7c* coqgsverage 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 from5d1r/9jjp kuuo5pzd, $10 \; m/s$ to $23 \; m/s$ in 4.0 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 ubk3 l:,u)dgn$19 \; m/s$ to rest in a distance of 80 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sp6m6y4xdv c zd.eed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially t+*(dujk i,f ulop speed abouud,fk lu(* +ijt $10.8 \; m/s$ in the first 11.1 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 speed yr/ grf-i++v as519j vdo8 eprof $15 \; m/s$ to rest in 5.10 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 2vbt rp1hi(8pon the highway. Assuming a deceleration of 8( pprv2 itbh1$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go-cs8 4j r-z-h,3dow uus t+cfling $25 \; m/s$ 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 les+28h nag25m-zxugrl z:xd 8hk s than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner mustx :2u zgan8zrh-dmkg 5+xhl82 then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$