Suppose that an object travels from one point in space to anyx:w x8rgao1a xmn+8,other. Make a comparison between the displacemeno8grx+ xm8:y waa ,1nxt and the distance traveled.

  When is the average velocity of an object equal to the instantaneousnz7p zj(*7b yk velocity?

  A new car manufacturer advertises that their car can go "frodp u y-s/50*y fdqvtw/m zero to sixty in 8 s". This is a descrip0 uypyd-f vt5*/qs/w dtion of

  An object moving in the (re pbokc2+w(x r-fsot6*zcl , 4.ner+x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car tjk,(05tn yjjya u7i58cks6zgraveling to the East (+x direction) begins to slow down as it approaches a traftj7 jkkin 5zyuac5g(6,s jy8 0fic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (hxvl mo:t1c zq* x5b:--x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acc h5*q-1x ozcm xl:bvt:eleration.

  Suppose that an object is moving with a constant velocity.k.m l ku5vr(0 ah,c3vz kb9/fq Make a statement concerning its a/50k(a v9, v fk.zkbmrlu3c hqcceleration.

  If the velocity of an object ieefo 93*er*jom w ic,5s zero, does it mean that the acceleration is zero? Support yourw5o9 fce,i*mj *eor3e answer with an example.

  Can an object's velocity change dire:wn 8m2nni f/oction when its acceleration is constant? Support your answern8 /:fnm nw2oi with an example.

  Suppose that an object x3rc8- ; jywemis moving with constant acceleration. Make a statement concerning its motion with respect to timewxm jyrc;-e 38.

  Can an object have increasing speed while its a /tc.wxzmddwq)7c8f5 cceleration is decreasing? Support yow7qtm cz).x58dwf /cd ur answer with an example.

  Suppose a can, after an initial kick, moves up along lfb( p9xgbd ,6a smooth hill of ice. Make a statement concerning itb9lx(g6 d ,bpfs acceleration.

  Under what condition is average velocity equal to the v6y0jfd h ca45average of the object's initial and final vva yhcfd60 4j5elocity?

  Objects A and B both start at rest. Theljj vuem jh3/j6 //r053fhaooy both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of/3/oolj/ a3j60m5ju rvfhhj e object B?

  Objects A and B both start from rest. They both accelerate at the same rat8l90tsh 76 k5blh kwiye. However, object A accelerates for twice the time as object B. What is the distance traveled by objecykll 7t5k8bwi69s hh0t A compared to that of object B?

  When an object is released from reu-e939pv 3ybahn+ajs (htv, rst and falls in the absence of friction, which of the following is true concerning its motion? yhp- +3j9 uetv(nba3 ra,9svh

  When an object is released from rest and falls in the absence of fr4: gs pgst. .5frra8dwiction, which of the fosfrr..ds 5twg8g:4 pallowing is true concerning its motion?

  Suppose a ball is thrown straigh,k.iwuuaeu 13hp) .rm t up. Make a statement about the velocity and the accelerh3 .w.uekpuuam, i )r1ation when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelpt7 p qg)l-a(vnw4u3h eration just before it reaches its highe7tqpl pua4vwn) h3g(-st point?

  Suppose a ball is thrown straight up, reaches a maximum height, thmmidk n7oh6:i5d8 5zren falls to its initial hki6zron 8d5md5:7 ihmeight. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straighsuw ji 4 )iq f0h.:w-wob:g,ust up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and ac:gws0biw:-uqs wj4o ) ,hiuf.celeration as the ball is coming down.

  Suppose a ball is thrown downward in the abseh bqat6 84n /iqso/s8gcgxc(/ng2e h0nce of air resistance. Make a statement concerning its accelerationsx2 a(t /n c/gb 6ioh/qn048cehqg8gs.

  Suppose a skydiver jegk**cw,yw +v8pu h;qumps from a high-flying plane. What is her acceleration when she she reacy *hgeww p +v8kqc;u*,hes terminal velocity?

  A ball is thrown vertically upward with a speed v. An 8uy b1pi+omi +identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the secipi1yub+m8 + oond 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 a building. One second later, b iku jphdeu *gz*3../nall B is dropped from thp u*e u*kzi.j.n/g dh3e same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is d/l2p2q i c tf/b0.zfj2 t5crebropped from the same building. As time progt z r 02/. bqlbijct2fpf2ce5/resses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is throw) a*c4 flp9ri2(pwan5y 5 qdwcn up, and the other is thrown down, both with the same initial speed. What are their speeds when the) laya5( 2c ww5cpq fp9dn*4riy hit the street?

  A brick is dropped from the top of a building. A second brick im5xocs., x8sl zl wt,bdn u-)-s thrown straight down from the same building. They are released at the same time. Neglm 5lw.8s,dzlo u,-xn)b-sx ctect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero v49q( +z+joe4 kqpvby6xtl /drelocity in the +x axis. The position versus time graph of this object ise9q+p4 /+xt yobvjzl6 kq4rd(

  An object is moving with constant non-nnq-m t-:0kb+e+moq l zero acceleration in the +x axis. The position vers-onme-l+ qkb+ n0:m qtus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The venf btl.r)(raxcp-1d -locity versus time graph of.1-tpan( )lr-f xd brc this object is

  An object is moving with 0 i1b*jcltj5 uconstant non-zero acceleration in the +x axis. The velocity versus time graph oclutjj*0bi 1 5f this object is

  The slope of a position vers; 5weznd(pfxs: .2hdn us time graph gives

  The slope of a velocity versus timethvun g6ca16: graph gives

  The area under a curve in an acceleration versus time graq 5-wh2m z+j(ll 6:j4n0.:fvr9ocn frm yt gltph gives

  The area under a curve in a velocity versu dr+hkxb2ap.f 7ea/t g6 9bsbmv ;g;u.s time graph gives

  If the position versus time graph of av hd cwm:,hc9/n object is a horizontal line, the object ism/9c ,hhv:d wc

  If the position versuekhcx oa*ua p 3y93-g)s time graph of an object is a vertical line, the object is )akachouy39*-3ep g x

  If the velocity versus time graph of an object is a horizontal line, cd3 b5xlv9rka 8k-x2x the object iskdk9bxv xx2a-lr 38 5c

  If the velocity versus time graph of an object is a straight line makini62; d/ vyzhesg an angle of 30 degrees with the time axise; z/idhs6vy 2, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trr)jxd vz+2atn/0vgp, aveled and the magnitude of the dp)v a,gn2 j/ rtvxz0+displacement vector.

  A boat can move at 30 km/h in still water. How long will i;:hle7t:-ghx4vsz j dt take to move 12 km upstream in a s;t4hh ldj x:v: e7-gzriver flowing 6.0 km/h?

  55 mi/h is how many m/s? *t7 lt.fv,pc fek)h ,a(1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.151rxrq-(+en j zy8h2sb h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What iirf g:,m m3(mwb+ys6q)t) m ews the average speed of the runri w sm,(y):mg 63+wmbtq m)fener in m/s?

  A car travels 90 km/h. How long does it take for it to travr c9nd9d;t:2wx+o z vkel 400 km?

  A ly (light year) is the distance that light travels in one year. The speedq0q:2kx ncgb*jv l 9d br6:k0w of light is jldnwvx9*6k0bb0q2:g :kqr c $3.00 \times 10^8 \; m/s$. 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 yoczvor ;6;oi-qu look to the side for 4.0 s, how far do you travel during this inatte6 r;qocv; i-zontive period?

  If you run a complete loop around an ou1unwb ji+ ..g+ ui*novtdoor track (400 m), in 100 s, your average velocity isg+n+*.in u wuvji1bo.

  A polar bear starts at the North Pole. It travels ncfu.-m k3 k zzv0l7s61.0 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.ck-m ks07z6unlv3zf was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 o s62hku olbc 7 sb5k* pm:5faz) jz*(sq3spf;km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starti* bskfc 6 a:75qo*mz(;zls3u 2kb sp sj)fop5hng point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weeke ob5n/:m+:2cpoux p 4r zaw.wtnd from school at 55 mi/h for 110 miles. It then starts toxzm4crop5bw:n: pu w .o/a t+2 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 km j)v.ofdvz b9 u+1iog*at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this troi.+ dvz91gj vfub) *oip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What iswi0/e 2r*tw, tpx)qef her average speed for0et,xtw 2 qwp *frie)/ the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north s:pnp/rg z1v:. s dnxz0l8at/for 750 miles. Whatn8rz g/ssdx:p 1valn p.:t0z/ is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs thex:3na;y vnapr /9rl4i 8acm5c 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 have when the team Av8 :r9cprl/;i 4aaxy5nc a3mn runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniform, ;fh wx5gpu;x9 +kn +cg8zlfbkiu1w4 ly and comes to a stop after 13 s. The car's average velocity during ;, b4iup+xwz1gcxl+;kg5 9fk8f nuwh deceleration was 78 km/h. What was the car's deceleration while slowing down?

  An airplane increases its: ,8u nnd4 u/4ym7hctqlkaiz , speed from 100 m/s to 160 m/s, at the average rate of yq:ud4/ nkh8lcz unm,i7 a4,t$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates awv tlr+8zp (n,::cjzqt 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 al.(xb gy.hn,h nd 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 10 s. It then s qvxu6igwoz03 fov)*:ja( db 4peeds up with a constant acceleration o0o u 4 :*f(o6jgv x3dvwa)ibzqf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.8 m/s experiences a constant acceleration auy: ji2,o0m c)z2k+.9 fybu0m naqt yo )cqnyama,. 2uui 9+zbyyjo:kt 20 0fmf $2.8 \; m/s^2$. What is the cart's displacement during the first 9.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) (sy3k9 ce c/ukwith a speed of 372 m/s strikes a sandbag and penetrates a distance of 96.96 cm.s9uk c (y3c/ke What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a c2,+lq q;dlca ratapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 ;,q l+ra cd2lqs. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest s** as5*fp p7uxbxz:zmoves 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. 7u+wpgxx ,g4uWhat is its average accelerap,xu47w gxu g+tion?

  An object starts froq 3 ee-r;d;o1 (rfcihzm rest and undergoes uniform acceleration. During the first second it travelsez rqe; of;h3r( di1c- 2.4 m. How far will it travel during the third second?

  An object is moving in a straight ling)v*zz i9- xabwurxr+u g).s7 e with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during u.-) )*rvxi gb uszr+7x9wzga this time?

  A car starts from rest and acceleratewtz/ejmbe 4 ,; cmjr*6s 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 decelet/z h-f9gp 1 t:q.pyrerate 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, henid0 uyhx40+ )tckcxr9z;+a car that has been waiting at the intersection s u0c +9exryxni 0 tzhdk4hc+;)tarts 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 of 12 m/s on the surface of pl s;m/ hnrty) m1n,5tf y9czww q.fo 7)s3lqhm7anet X where the acceleration due to gravity i 5ws;1 ,t9)wmqmo/ ln7rsymthffhzq. n7 )3ycs $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of o33 /wet(lmoi*x2 od u12 m/s on the surface of planet X where the acceleration due to graviluwo/ i3ot*2d3xo(m ety 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 1 s q-hfu41 squefzw(s 7n:x8y8:+wuw s5 m/s on the surface of planet X where the fuxnw1 :- u8 sw8esuw s4qq+f(szy:h7 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 1j) x3y /9qxbna4 m/s on the surface of planet X where the xq/bx93 ja n)yacceleration 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 fr t.rw1s:kzv 22pph;qziend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler ttzvp:pw 2r z2q;k1h.so fall before you catch it?

  A ball is thrown upward at a bk)itnv-bg( n-2ue v8 velocity of 19.6 m/s. What is its velocity after 3.00 b -u(t i)vveb8gkn- n2s?

  A bullet shot straight up returns to its sta f ;zki)bq17shrting point in 12 s. What is the initial speed h;q fsb i7)z1kof the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Hozjehl ,/ 935sbe:coq ow long does it take to return to its startinh5zeqs/ e:,jl9ocbo 3g point?

  A ball is thrown dowvblpq.h bu*3)vhzko- 9s7u q-nward from the top of a building with an initial speed of 6 m/s. It strikes the ground after 5.6 s. Hluq-.-3o9pz* sqhk vv b)u7 hbow high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (5pk 7e-4pycwae s( -qponly fill in numerical value in the bl-- ye54ke(p pws7cpq aanks)
(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 aidm*a.rv3. lk br with a speed of 23.0 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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the 7gpmzp2 zdub9o5:b 1vvelocity at t = 1.0 s?

  In Fig. below, what is the velocity a vnp1l )zjbfrwx6.*7tt t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s?/h.ic8rcx9, wo* zwg u

  In Fig. below, what is the velocity at t = 5 c;x asyj3i4t) c5ltf twn7og, -r;z8m.5 s?

  In Fig. below, what is the average velocit-7 hv96qm pu zqv oq,3e(qfro)y from 0 to 4.0 s?

  In Fig. below, what is the avedo4xn / .cob(urage velocity from 0 to 6.0 s?

  In Fig. below, what is the ac1sz 4.ggo tamn-o:wv:celeration at 1.0 s?

  In Fig. below, what is the w+y) raxk19quay.sxwdir4 .+ acceleration at 3.0 s?

  In Fig. below, what is ykw5j(9 vaacol b)zuunj8*4n w(8y0ithe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration free 7*qlkdlh/s4h 5 huj0lm5e*om 0 to 8.0 s?

  In Fig. below, what is th rvo opy 6i628k;x(wrle displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spe lr; e3.f+ b76ei5u:cqxdhncned|velocity}

  An object can have a varying s0 +h*qlrqbz+o-b;qwc v (ju i0peed if its velocity is constant.

  The velocity of an object can be negative when its acceleration is p2nujfq icd0 +e0 9h*bcositive.

  If one object has a greater speed than a second object, the first must5 2jlg(,srj//tnfdk8w o e9fz have a greatedfk2o( w5s,l jetg89jf n/ rz/r acceleration.

  Two cars emerge side by side from a tunnel. o7 1vj+ s. ypx;iifjx*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 acceleraqwoi) /t4f)ej tion decreases.

  A baseball player hits a foul ball straight up into the air. It leah:3byewu-n .4*xoedi /hf d g5ves the bat wit5egf : .dx4ob*3nwye- h/hiudh 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 hxn ncht)u*n4 r6s)7s up, what is happening to its acceleration, how does it change if air friction ixcr n s7nut *)hn)hs64s ignored?

  As a freely falling object speeds up, w59 d(ulho a1m(sn )gug vw -e)ewug(-khat is happening to its acceleration, how does ikm(ul waggd-o 1)(gw 9n uvees-u5h) (t change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to ix8 kdgr0w t(+dts original position with the same speed asd8w xdgt+r(0k 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 nonb p)3en-:be vizm.gysnw2 m(ym+kqv)n 4- c0szero acceleration at the same time.

  An object can have nonzero velocity and zero accelerati5aiu*wt +fwa8 on at the same time.

  An elevator moving from the sec*za9gp/ztz *qond floor to the fifth floor making no stops along the way has /a zqt9* gpz*zzero acceleration all the time.

  A rolling ball moves fvj+s b4ghvr:5x5 h8hbbj6dk9 rom $x_1=2.1 \mathrm{~cm}$ to $x_2=-5.2 \mathrm{~cm}$ during the time from $t_1=3.0 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.8 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comple;pl hgg .js-owr qh1 6rywc74yl:/c 8ete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its traine.p8 ,ufpd:hi0tw. ocnp y 59eg/ ;znbnr in a straight line, moving 90 m away in 9.4 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate/u;yc ig.pn.9t 8b0z5f :dpnh,e wnpo (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 xy06-.5xht oird1bx .*ig6naxh9k c yom $11 \; m/s$ to $23 \; m/s$ in 5.3 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 wjqyahfb) 574y*1m 1ue uo kf: emy;g,$22 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach abh1:s/a*rrh5 ypc9vi wrur )zz x .z9, speed of $31 \; m/s$ 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 out of the blocks to essentially top speed abou0 -n-en+j nqoaxcglw,/e; xxv;q o+ t8t gjeo;xwot qxaq--+c 8l 0x,;+nnev/n$10.2 \; m/s$ in the first 12.6 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 fr p,q lx-ncx4:bom a speed of $19 \; m/s$ to rest in 5.05 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 ox ck454xnww3+6famop n the highway. Assuming a deceleration wwc6m+nf a4p ox5x k34of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingf.s ya w8r: yby/+:jl2ie,(0mkmrr xo eca 0k) $25 \; m/s$ 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 t8ii nlf vk35;zhe 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must ;nilz k 83vi5fthen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$