Suppose that an object travels from one point in space tonca 1.,2vv5a mopxe/d another. Make a comparison between the displacement anda2e5c/nxom v 1v.ad,p the distance traveled.

  When is the average velocity of an object equal ta6tvi. / gldv(a0 6lsjix,h 8po the instantaneous velocity?

  A new car manufacturer advertises that their car can go "fro/sdc*)i/ivbkc 0c3ne.5n cipm zero to sixty in 8 s". Thi0c5 v/3p i.ecc bd n/kiins*c)s is a description of

  An object moving in the +x axis experiences an accelerat, ho:sgq oq71rion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) y69usd w)2aa1us zbud* g-av) begins to slow down as it ap2zd1va 6a 9 d)*usuyswua)b-gproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x dl)j .n df8dlo*2pbw2g irection) begins to slow down as it approaches a traffic light. Make a statement concerning its ao2gfdlpn )8j.*d lb2 wcceleration.

  Suppose that an object is moving with a constant velocit+fzz0hf; 4 bxky. Make a statement concerning its accez4; xhf+b z0fkleration.

  If the velocity of an object is zero, does it8wlk: -g gw qtjie. ;+aj7xcy6 mean that the acceleration is zero? Support your answer with an e;lw:cg.y j gk+qjx6t-7ewai8 xample.

  Can an object's velocity change direction when its acceleration is constangw9abtlh.x 5nhnuz-r /k /2rk qh6x1,t? Support your answer with anx 2r k9 .xln/ t-6q/zbg5h hu1knrah,w example.

  Suppose that an object is moving with constant acceleration. Make a statemen6eoak ;*r+zqdt concerning its motion with respect tk z*r;d6eo+qa o time.

  Can an object have increasing speed while its acceleratin mie86o8eybgt;-)w y on is decreasing? Support your answer with an exampm- yt8ew6)e8 ginoy; ble.

  Suppose a can, after an initial kick, moves up along a smoo*;ox,yy7 ma i,gwmug5pu0 yb)th hill of ice. Make a statement concerning its acceleratio,buyyp 7*ux5;)mg0m a wy io,gn.

  Under what conditiondrnv.ou+ 3()mq.p g yp is average velocity equal to the average of the object's initial an+()uq.3rpdg vn o.mypd final velocity?

  Objects A and B both start at rest. They both acn7l2/oq x3 hehcelerate at the same rate. However, object A accelerates for twice the time as objec nh /oxl37h2eqt B. What is the final speed of object A compared to that of object B?

  Objects A and B bothu080 k1w;m b+hww deeo start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance mk e 0;eu+whwbw10od8traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of friction, whic4z 09b6* az+f; j- szbrcievfch of the followi fi9jcb04b;e+ r va6 z*f-szzcng is true concerning its motion?

  When an object is released from res3.:fom3uri alt and falls in the absence of friction, which of the folm ui 3:.r3afollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the vel-2z vw77pd;pyshc;liocity and the acceleration when the ball reaches the highest vd; pyz2h c7;lw p-i7spoint.

  Suppose a ball is thrown straig ik5z,h g)ojs.ht up. What is its acceleration just before it reaches its highest poinihgzk)osj,.5 t?

  Suppose a ball is thrown straight up, r c (p:x(3a -1w0a lw)rrboktjjeaches a maximum height, then falls to its initial height. Make a statement ab0()(1ocw-3j pxw ralrbtjka : out 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 it. py 4 yvdtn cr9+nf:q7slmle.u*w(4as initial height. rp:f(nym t.al. 4qw9lsd+e 74nvycu* Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absencef 1vc.y6gq pd3 of air resistance. Make a statem31dcvy fqp 6.gent concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acc+u xs.(owk ,pu*+*paare -f ;jlshxs7eleration when she she rf,*wrxl.(;+ sjh as a7spuo+ p* u-xkeeaches terminal velocity?

  A ball is thrown vertically upward with a speed v. qly584e mqc9zAn 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 timqeym9q84 5lzces higher does the second ball go than the first ball?)

  Ball A is dropped from the top of ufl4c1 dd/5ch vc jfj.0(j9pb a building. One second later, ball B is dropped from the same building. As time progrespjvfj 4f0d ud(1cb9cj5c.l / hses, the distance between them

  Ball A is dropped from the top of a builk. 7 v9*m;ndmu bygcne-nu *4cding. One second later, ball B is dropped from the same building. As time prcg*ku. d9*vmnm7;nub4cny - e ogresses, the difference in their speeds

  Two objects are thrown from the top of a tall bmb 9k0eypd foez+. +s1uilding. One is thrown up, and the other is thrown down, both with y0dop m+eb1k 9f.zse+the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the ty2 f56k4 q 43aoa gwnq+9wxjnuop of a building. A second brick is thrown straight down from the same building. They are released at the same tima2+x yquan k5 wo49ng46j wfq3e. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The rixrh/t4at f.- owh.6position versus time graph of thisf4ahw.6hir/r -.ttxo object is

  An object is moving with constant n+y4imia) 3 jcl4vw7nnon-zero acceleration in the +x axis. The position versus time graph of thisc44+in7n ywa3miv jl) object is

  An object is moving with constant non-zero velocity in the +x axis. The velu5-twr1xt5v o um,;w yocity versus time grap,v5rxy5 otmu -tww u;1h of this object is

  An object is moving with constant non-zero acceleration in the +6ygw x64n)hgax axis. The velocity versus time graph of this o4)w g6ga6hnyxbject is

  The slope of a position versus time grawey2e5tk)0onpiaza c2a3th jad3/d;7mro ,;ph gives

  The slope of a velocity versus temh 43 wnwf.m7ime graph gives

  The area under a curve in an acceleration versuyuvnnm/ob2t v7e (8:ys time graph gives

  The area under a curve in a velocity versus time gra107 sgeedvb4rx 4 8fbgph gives

  If the position versus time graph of ab12w 5l5krfqog+nod*zxqc2- n object is a horizontal line, the object cwd+ zo2l5 q-bxor5n*k1f 2 gqis

  If the position versus time graph of an object is a vertical line, the objectm3 kxdt8 rmn2 (yeh0xh/d-p beerz9/0 is80 x0 hzx -ehr3(b ydd/m2 9etprenm/k

  If the velocity versus time graph of an objecth+g. d 7yqfvi2 7bop:d is a horizontal line, the object i7+2v.y: iod qdhfp7bg s

  If the velocity versus time graph of an object is a straight line making anfj oco5 9gp3 u:+ --ibw7vwdcoro3k7w angle of 3of 39ic5g brkoo3w-wdc v7wop+: 7ju -0 degrees with the time axis, the object is

  An object moves 15.0 m n7s, mutt88o liorth and then 11.0 m south. Find both the distance traveled and the magnitude of the8tsuio ,l tm78 displacement vector.

  A boat can move at 30owu+ ek ,sm2m z:muk5mg6)my. km/h in still water. How long will it take to move 12 km upstream in u o,wsu6mm.kz2yek+gm) :m5m a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1ha wdm) pt*1+ls;z3, md2vz qk609 m)

  What must be your average speed in order to travel 350 km in 5.15 h? 4(h+4( edvpc in+uaer

  A runner ran the marathon (approximately 42.0 km) in 2et/8jhyud7 p+iwk)5n hours and 57 min. What is the average speed of the runner in m/sd/ eh7wu5p)n tk8 jy+i?

  A car travels 90 km/h. How longl/o n 1n/ubtv r2kb*-d does it take for it to travel 400 km?

  A ly (light year) is t0pqa*7p+vc t :4 zzn/wkvnb( mhe distance that light travels in one year. The speed of light is *n7znmq+kz ( p4av/0c wtb: vp$3.00 \times 10^8 \; m/s$. 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 strai6 /os)4d-mrktlh ym a3ght road and you look to the side for 4.0 s, how far do you travel duringlh/ 6m sody4)t-akm 3r this inattentive period?

  If you run a completesjufe6sx ko .,4x22ya loop around an outdoor track (400 m), in 100 s, your avera6oa2.4s ,xjfxeskyu2ge velocity is

  A polar bear starts at the North Poleq)r ku8b4hmuelm d0y**:,viw . 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 min. What was the bear's av,0iw)bkul um 8:mye 4hvq* rd*erage speed?

  A polar bear starts at the North Pole. It travels 1.0 km souehc)jrtjj4d2.zxitsa(/5 , c th, then 1.0 km east, then 1.0 km north, then 1.0 km west 5x( .tajzhd4j2eijcc t)s/,r 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 school at 55 mi176s.5bostx0 m djcet/ lb/q z/h for 110 miles. It then starts to snow and you slow to 35 mi/h. Yoc6l.e/doj 1qtbb0ztxm 5s7 /s u arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the averizpoqg)l.h)c,+ mrh8 np- 8b xage speed of the motorist for this tri)qm o-h8i h.z,cpg+b)px8n lrp?

  A motorist travels flt1p 8t yq x(nb0g-8oqor 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tri-yn88 g l1ox0pq qtt(bp?

  An airplane travels at 300 mi/h south for ,8czkf t+rur.2.00 h and then at 250 mi/h north for 750 miles. What is the average sfrt ,z8uk.c r+peed for the trip?

  In a 400-m relay race the anchormaylwokvuw 6x(x 9/q/h. n (the person who 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.xhl kwvq6yu/. (/9oxw1 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 cometh1r 4ijm-2y5r4 l5 jm kzpnq-s to a stop after 11 s. The car's average velocity during deceleration was 48 km/h. What was the car's deceleration whi-n t y2m rlz4mp5kjjr154- ihqle slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the aveb 1a;htxh 0-pxam7ie (rage rate of ha1phxiemb (-a tx 0;7$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thl :i hehmnw 5 hrxz(qr 1c3w7zg,5u-6b +yu-xse 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 agp3gfv- j4-n wf*0k fknd 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 zur39y .ud g -cqy( .cso9nf5vhi0) kum/s for 10 s. It then speeds up with a constant acceleratio -v uu.gd.qn99uoc3r0)yyfch k (5zsin 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 5.8 m/s expq ukwz)*blvub/tcale -cnvx,i;i2r471 c3c 5eriences a constant acceleration of;w5c) v1/u,eak2* rb uqiixcnvc47z 3c l tl-b $3.0 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontally to the right (+x direction)9 lp6uffooj81 with a speed of 482 m/s strikes a sandbag and penetrates a distance of 19.99 cm. What is 8o9jf6po luf1 the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is laudxzh7 yl;k,ki)+o7j vnched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelex7+kj; zioly7,d)hk vration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accelerationxxi5 q+uj l-,w 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 itszq:du,psf ,e nl ov6.u:;sv4 p average acceleratp ,;,e:.v:o6spldsvz n uu q4fion?

  An object starts from rest and under s*j4;b21juax,rwk g bgoes uniform acceleration. During the first second it travels 6.7 m. How far wijau,jg*w xb 2sk4;b1rll it travel during the third second?

  An object is moving in a straid.xf1,h qx(mhght line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is t. dh(m1 qhxxf,raveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at f9mwe4o i6r, o$3.0 \; m/s^2$. 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 tiresjb,9 xl;o2 kx4. cqskl on a dry road can decelerate 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 that hasdxf qt7ba6 /8s*,t 9b3aesvuw been waiting at the intersection starts ahdw 8v79qab /ut ebs6a,f3tsx*ead 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 wreq p f/)8zbdn +w9s/kesgk;/ith a speed of 12 m/s on the surface of planet X where the acceqgkn9zs8k ;f s /br/+depw) e/leration 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 the sui+4 edk 0*;r grhbc5kurface of planet X where the acg4 e*kk ruhi0 d;5+rcbceleration 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 the surface ofzz n;7s1iegzk +br5z 7 planet X wher5b es z17g+r znz7zk;ie the 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 hxq;. yub td wr;hxmc2g9-3g) with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity hrx -gu;m xtwb);c.y2h9 dq3gis $3.5 \; m/s^2$. 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 ruloo 969uxhtju *ja b+ld9nq,qunn:+ h2er betweeql,xq 9j+nto+bn926un*9djh:ua o hun your fingers 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 19.6 m/s. What is its velocitpr.v b)/adnonu h(( i-y after 3.00 ui ba (dh)pnno-/(vr. s?

  A bullet shot straight up recgf9xj;ub4sr +/f u 9vturns to its starting point in 13 s. What is the ini;cf4f+s9j gvbu9/ urxtial speed of the bullet?

  A ball is thrown straight up with a li 4-r* f5x1m9iy db2 hhayjhu)z2 3gsspeed of 36.0 m/s. How long does it take to 2hfmb x23)id- z1iyhaguj *5 4hlsy9rreturn to its starting point?

  A ball is thrown downward from the top of a building with an*ieoro+5 jhy0w u(r l) initial speed of 7 m/s. It strikes the ground after 2.4 s. How high is the buil ohre0*ojr()l5 u+iwy ding?

  A ball is thrown straight up with a speed of 30 m/s. (onll(j q4kq+0zx4+ mfd;pvc/x/4qxlq uay fill in numerical value in the blanks u4dalq04xkv4xzx+; fj+/qqp/ (mcql)
(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.niz8g t/ei b.s5e j3.,dyoef with a speed of 29.6 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 1 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 azd ;dtm lr:,ix3(5yov t t = 1.0 s?

  In Fig. below, what is the velocity at c 7m6xrq c 48(hhfqzc/t = 2.5 s?

  In Fig. below, what is the velocity at t = 4. zwwg 109jcm(z0 s?

  In Fig. below, what is the velocity at t nbv fx6xqx;- 46xkyt:= 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4nwyk3 cyo( yqbeh56j).*wf0k w;y.vg .0 s?

  In Fig. below, what is the w1 x4zrg1y d+ c6omlotl/he1 )average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratbk z6/c 27ko pajw*2whion at 1.0 s?

  In Fig. below, what is the acceleration at 3.qwt(t s+q7 oj.0 s?

  In Fig. below, what is f tq) wmwa/.,zthe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 yvl,u0q k v +7sfqbd6,s?

  In Fig. below, what is the displacement from 0 to ,rr;lg((nj :fnbz9 lf 8.0 s?

Does a car speedometer m:9:e7ml ;1tkej lztpkeasure speed, velocity? {speed|velocity}

  An object can have a varying speed if wd pp(jedls9;aw) 1.sits velocity is constant.

  The velocity of an object can be negative when its acpb, 1n,qv7 2.zgbcszfceleration is positive.

  If one object has a greate s0lxwjs)ci) vlguv* yd ve6/6mrk58 4r speed than a second object, the first must have a greater acceleratd s6s48 glk r60vc)j)wv*m ev5y/uilxion.

  Two cars emerge side by side from a tunnel. Car hrq os/4 v;fhhmf261n 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 v c)deucr;2h8decreases.

  A baseball player hits a foul ball sto7 sexug1gg r:69f hq,raight up into the air. It leaves the bat withxs1qu6ge gf7:r9 hg o, 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 to its acceleration, mz-4il5)g(t x 1xzi2yepq q8uhow does it change q xi)(4 zzmeyugqt l1x-258i pif air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerati+q+xdwx/na-w 1 c6 zazon, how does it change if air friction CAN NOT be igq1+6xz /zwd -c na+wxanored?

  An object that is thrown verticallya/qyz))kqv( e upward will return to its original position with the same speed as it had initially if aie yk(qazq /))vr resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero vcyyt+ke 486k,o aqd n6elocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero accelerak ,z;*5cljs hbtion at the same time.

  An elevator moving from the second floor to theyzee*o ah8 aaan-*2l5 fifth floor making no stops along the way h*a2ae 5a-h y8lo nza*eas zero acceleration all the time.

  A rolling ball moves from a6p9 kq1lzf4cw 5 ggj 05.ljco$x_1=1.8 \mathrm{~cm}$ to $x_2=-5.2 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight com c7t5;jovhps(/**yitjci1 biplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.8 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 109 m ad ;-07u juagz,r)hv2 ygpu,qxway in 12.0 s. It then turns abruptly and gallops halfway back in 4.7)7vzj-u2 xyqhg ,gurupad ,0; 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 from84py .p4,eg)s lrbmb;; br hvs $13 \; m/s$ to $22 \; m/s$ in 5.5 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 frompjufy a53ob1x(9 pyx3 $21 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sp;4rlp icb9 a/ i:nbi2dh eae;;eed of $25 \; m/s$ 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 out of the blocks to essentialn2ns uz1+g:8 .ihdpm.yjdz4c ly top speed aboun4.+ydudsg 1z:8 jmh pc.in2zt $10.6 \; m/s$ in the first 12.5 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 5wdjck;/gaam y9i/f 3a speed of $15 \; m/s$ to rest in 5.23 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, j1s7 opj bmz04qcg53 .yzkyb,a car leaves skid marks 92 m long on the highway. Assuming a p j ,ybsk1mqjz3z b o0.c5y47gdeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi6o ; hfvk( 3hdw/k-r h)3wrbmong $25 \; m/s$ 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.dqhh0dj r20/-z-nx s cq3 xue(0 min. After exactly 27.0 min, there are stillshdn0r3 z-0h (qj-xu2e/dq cx 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$