Suppose that an object travels from one point in space to a 50rtgurhs+15ko u4bn nother. Make a comparison between the displ0kosr h 41uubt 5n5gr+acement and the distance traveled.

  When is the average velocity of an object equal to the instant l,;hrafqa6 .ianeous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixtw9d,stc)*j hly in 8 s". Th)wd ,j*hls 9ctis is a description of

  An object moving in the +x axis experiences6 lgug7 0j ed8(3xunoy an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins tov;oj9)es yf w4 slow down as it approaches a traffic light. Make a statement concerning its accelerat);yvs eojw4f9ion.

  Suppose that a car traveling to the West (-x direction) beginhk h+ mdd.8u j+.y9shs pw;li/i -dd*rs to slow down as it approaches a traffidm;dydh/rssuh.*+9wi8j k p h.l- id+c light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. gj wc-i q.r/y5Make a statement concerning its acceler5 gr/wj.-iyq cation.

  If the velocity of an object is zero, does it mean that the acceleration is zerz m6e 6ztln lk0cpmt;dn:2 f;3o? Support your answer with an 6nl2 p3fzmzk;et ;m0 d :c6lntexample.

  Can an object's velocity change direction when its acceleration is constant? S/dlsxou nfu*k6/ su7 w7p :6boupport your answer with an examplow: xds// u 7fb6uk6uspl*7no e.

  Suppose that an object is moving with constant a.gk0lm r(3et3w c 2qlk8 5qnar/*jmbgzy.lc,cceleration. Make a statement concerning its motiotg(q /lr2c lq5,cblz ryja3m8*mgk.w.k3 0nen with respect to time.

  Can an object have increasing speed while its acceleratkianh + yh- cv09ex8b4o.7 rdmion is decreasing? Suppohv98x m iry7 a0h-ko db.4+necrt your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hiij4tkg 9o ,s*zll of ice. Make a statement concerning its accelerast*gi4o,9j z ktion.

  Under what condition is average velocity equal to the average of the object's inm41yu tuc3,uitz+ jq0itial a+t1 ijtu4 ym0 ,ucz3uqnd final velocity?

  Objects A and B both start atsd mtyeh;1p ;si-.6c)y tuln 1y) :lzf rest. They 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 object scny-lp1;h lm zt;iyfyu6).te:s d )1B?

  Objects A and B both start from rest. They both accelerate at the same rate. H nn alz(3c 47nwd8z,gpowever, object A accelerates for twice the time as object B. What is the distance traveled by object A com,(zlcwdp3g8nazn 47n pared to that of object B?

  When an object is released from rest and falls in the absence of k0+hq7): j bkyaur1l cfriction, which of the following is true concerning its 71k)+r kayl:ubc0 qjh motion?

  When an object is released from rest and falls in the absencc0psu my6ivk i*.5jv+ gxwb .x0 mn)7ke of friction, which of the following is true concerning its moti5mykwjvi xum.i+kbs.v0p cn70 *6g) xon?

  Suppose a ball is thrown straight up. Make a statem8sbkp/)ks h- xent about the velocity and the sk- h /)pkxs8bacceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just befobjmav.h 3bhg4 k5)jue,ofxpcc74 y/5 re it reachescbhy3x7p5uv5khg4je/o.jb4 fa cm), its highest point?

  Suppose a ball is thrown straight up,b-m zq8e+toyax;n 2 by 64q6yh reaches a maximum height, then falls to its initial height. Make a st6;+b2mxyaeq6yqt -yozb4n 8 hatement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, re f;i0jr(/frmx aches a maximum height, then falls to its initial height. Make a statement abj i rrfxm/(0;fout the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistanpg q, adl*-oa)ce. Make a statement concerning its acceleratia-*gq dpla o,)on.

  Suppose a skydiver jumps from ag ma9tk1w dio1um 2f0un v)9a4 high-flying plane. What is her acceleration when she she reaches terminal velo29k9 1a ufga)wn4i to1mvu0mdcity?

  A ball is thrown vertically up5a a2tvpc,xvgdpk oza+63) 7 qward with a speed v. An identical second ball is thrown upward with a s,d5k2paaq +7t)3ap v6 zoxv gcpeed 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 a building. One second later, ball B iyazyf)dt4 k5 :5 n3s,upjy -qas dropped from the same building. As time progresses, the 4fpa3n: -ysyqkjtyz a5u d5),distance between them

  Ball A is dropped from the top of a building. One )ljt quz4i lq 3+(t3ussecond later, ball B is dropped from the same building. As time progresses, the differqql(istu 34z3)jt+ l uence in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, aqt8 qbhgc.c(5nd th q.(q8tbg c5che other is thrown 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 bricknofzgnh3oz nla (qik.-09d0 * is thrown straight down from the same buik0 da(ngnzn.9 -o0 h*oqiflz3lding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constantda :bv+ru vn s33u9p;xczc-f( db87id non-zero velocity in the +x axis. The position versus time graph of thi;dbuf8s3v d9un7c :xa cb-viz3d+( rps object is

  An object is moving with constant non-zero acceleration in1me;wi-:u hho5i. z wc the +x axis. The position versus time graph of t: wm iuhzio1-;h.we5c his object is

  An object is moving with constant non-zero velocity in the +x axis. oeo1tvi fos 2go4*4-.cf0q x pThe velocity versus time gr0-*gvs qix.fp4 4ooo 1tfeo2caph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Thql:* 3, wxhh)cf mt 0 *65v/fkrnrkhcre velocity versus time graph of this or),*fhkw6c 3 f qhm0l*vrk:c 5hrxt/nbject is

  The slope of a position vb)z7pex;j v te-6/qbe)d)lv lersus time graph gives

  The slope of a velocity vers w1xly dqtgfub(a*;6zds: -911nwuiqus time graph gives

  The area under a curve in an acceleration versus time graph gives8x . whncb,)md

  The area under a curve in a v1* sglscd*-k ielocity versus time graph gives

  If the position versus timsj-crm bs ;gr5+))mndg7dh h( e graph of an object is a horizontal line, the object mggmr;+h s (db7-r5cdn )s)hjis

  If the position versus time graph of an object is a vertical line, thw5k (9f/1. pihq kmqyqe object is qq/5pm ifq.(1hk yk9w

  If the velocity versus time graph of an object is a horizontal l.ew 4szimnn2i+q7 txqu9;to. f o/j( jine, the object n qs;zmqot(. 4 . ij/2uwfxo+7it9jenis

  If the velocity versus time graph of avwn5 6pzms,5e n object is a straight line making an angle of 30 dee,vmsnw 5pz5 6grees with the time axis, the object is

  An object moves 15.0 m 9ll) e7zu9u g3r r;nvenorth and then 11.0 m south. Find both the distance traveled and the magnitude of the displacemgee;ulr )9 ulr397vnzent vector.

  A boat can move at 30 km/h in still water. How long wil55e c adkmi ihj-67dso o-rhy;/dn8-zl it take to move 12 km upstream in a river flowinj o7y k5-8d- ;r ad6oihi5ed hs-/cmzng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 5z3pmi;uc g8w 1609 m)

  What must be your averagete9ip xlfik2g , lr;2t z9/3bt speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 htim: v 6m6fqimyrg9nyl1hwg1 n: m+:7ours and 57 min. What is the average speed of the runner i ::gh6iwtm+ rny7y n g1 q:v9f1m6lmmin m/s?

  A car travels 90 km/hk mr, b;q2m cly-d5e:a. How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year.cnfo;lrld:de 3*9i /e The speed of lighe il:;n/d9*fclre 3odt 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 47skiep7am 9o/ q4gfmlook to the side for 4.0 s, how far do you travel during this i/omp m4f7a7g94k eisqnattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yn2rcu nlz4c: c 0)vjx) /kih(auc7p-y our average velocit 4)clcz7:i uy)n(rpvx hunca/-c 02k jy is

  A polar bear starts at the North Pole. It travels 1.0 km soutgc778zfwhia92 ygda3 h, 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 averaa7937y izg2dc a h8wfgge speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km ey x lo944haog8ast, 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 9ox4haygo 84laverage velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles.wdgez;3f )vvtv f*o8s4 m1b8 s It then starts to sns*v)mgvt8of bv1dzsfw3 8 ;e4 ow 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 x-72cbxb/qcikm at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?c -x/bqb i7cx2

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 1z54 ,i1: ypec h3anaku00 km/h. What is her average speed for the :31ha ea,iynk p4cu5ztrip?

  An airplane travels at 300 mi/h south rm1ajm+ n7d/9 +qfj hxfor 2.00 h and then at 250 mi/h north for 750 d+mhmr jn1/ qj+ f97xamiles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the perso:0qu l ns)5xxpn who runs the last 100 m) for team A can run 100 m:ul0 5xxq pns) 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 comes to a stop after 12 s. The carzuin (; +7 lx9 n9dkg)nni9gtr's average velocity during deceleration was 69 km/h. What was the car's deceleration while slowing d(uxn rn9itgg z 79dn9)+link;own?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average emc74htd:,d8d +rks brate of d,+ :tsdd8er h4m7 kcb$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/hi8.i td,uhtmm./ca70 7vod vl accelerates 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 ay 2nv5dj+ylo3 ccelerates 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 thj8*2adk 6( liq3twozmen speeds up with a constant acceleration of d 62iz* (jkq lmt3w8ao$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocixs7v t(en4*x5q7zdsyty of 6.9 m/s experiences a constant acceleration ofs eyxnz xs*v45 dq(t77 $4.0 \; m/s^2$. What is the cart's displacement during the first 9.6 s of its motion?

  A bullet moving horizontally to the right (+x directiohw4fe 0 ) u zf;yru0at;aiz4y;n) with a speed of 498 m/s strikes a sand;4wu)heizy0ta 0;;zafuf4yr bag and penetrates a distance of 75.73 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. Itz 2fodhsmo(-:5mhi -j0dqbq ;zk6. ug reaches a speed 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 catapult2 hmgkjz0 dof.o6q-dhz(-qmsu ib:;5 ?

  A car starting from rest moves with constant accelerauzm fqgejwn8tf/)( mfv 0;7. btion 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 czp;s4pj; hxzxa f(.(/s in a distance of 200 m. What is its average accelerat 4;xs(x jpcp.( hzaz;fion?

  An object starts from rest and undergoes unifor)zbluu.a 7hzx3 ) s7com acceleration. During the first second it trav3b) z.a7lz suo) xuc7hels 2.9 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceek 3q,/wshrtkh(r sgo 6 31t5hleration. Initially it is trthg1 h t/3 okr,356sse(hqrwkaveling 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 accelera/9ytq:4kjk d 9/uz- pvd n*fiwtes 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 dece4fofo , .ltrd8lerate 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 has been waiting at l(sm ,gve20o4a2oe0tm)lu on r2sz. h the intersection starts ahead wnl2olm(u4g0evsoe, t22 ) smaz.ohr0ith 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 f2w22qm un nb((bl.juupward with a speed of 12 m/s on the surface of planet X where the acceleratfun 2m(nl2(bwq ju.b2ion 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 sur qa (ohn c3g49ijc35aoface of planet X where the acceleration due to grav(4ja an3o5ih9oqcc 3gity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwarbr kbjx+u11zz ayl ;2*d with a speed of 15 m/s on the surface of planet X wheuk;+ *y2bbxrz aj lz11re 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 with a speed of 14 m/s on the surface of planet Xa/ighpe9o 4m 3cj:m7j where the accelerationmgp3 aoc mh7j4/j 9ei: 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 friend holdbwp lo*p63gi -ng*p;nbg 1y1u0 f v/axs a ruler between your fingers and releases it without warning, how far cx/bp n pw6;3*gyug apf01no-li 1gv *ban 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 velocity0)qlt kb;1 cgp after 3.00 sqb;g 1c)0ktl p?

  A bullet shot straight up returns to its starting poina s(qt rpkl * 44;4ulhn3nl-xat in 14 s. What is the initial speed of the 4q llpxlk;at(3 nhsn 44au-*r bullet?

  A ball is thrown straig)kwbr-cjya;(1 erb lp5 k. a.nht up with a speed of 36.0 m/s. How long does it take to return to its startin( ;.ky-b r ra.j5nk 1aweb)clpg point?

  A ball is thrown downward from the top of20nbgth 3 xc,z a building with an initial speed of 20 m/s. It strikes the ground after 7.1 s. How x2t,zhb g30cnhigh is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeri6t avy ag.d5r*cal value in the5vag *tr6.yad 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 straight up into the air with m;.b (d yq(5q jlzpjj5a speed of 49.6 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity akvm-vr6f 6lo7t t = 1.0 s?

  In Fig. below, what is the vv7-o++nkf qqpelocity at t = 2.5 s?

  In Fig. below, what is the velocity at t u. aj44p vlzu *qr qb,o4cqn,m ;qe3s4= 4.0 s?

  In Fig. below, what is the v cda212r4gqjsy;q4 bscm2q2 lelocity at t = 5.5 s?

  In Fig. below, what is the average velocity from lrzug 3 q4ko;roji, 2. swtyrcc, y,:20 to 4.0 s?

  In Fig. below, what is the average veloce0g eban76as kia;q83h6duc8 ity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at9p *wx*gh ,eyy 1.0 s?

  In Fig. below, what is the accel 6jzuwcfl tp7c2ox 4,+eration at 3.0 s?

  In Fig. below, what is the averagep t9o5ivkyj 1;r2*gn f acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0l2(4p5bzd nafagzih4s5h.m 4 to 8.0 s?

  In Fig. below, what is the displacement from 0 0bvulr3e+:y u to 8.0 s?

Does a car speedometer measure speed, zm7ow0 3 cej;2xj1p akpu2h)i)d2bupvelocity? {speed|velocity}

  An object can have a varying speed if its velocity is c14zxkx bi*o, n scjiq86lx-m2onstant.

  The velocity of an object can be negx )z3 kn.nal.,wnkw00 g db3oligrk47 ative when its acceleration is positive.

  If one object has a gk2a t4wta8dn5reater speed than a second object, the first must have a grea5taw42n8k t dater acceleration.

  Two cars emerge side by side from a tunnel. C .8p8.y(ruav6 wskfvhmp5y 0car 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 decreasee-*gmtdn(dgf5dou e+ sp h ,5;s.

  A baseball player hits a foul ball straight up into the air. -2zl4(tff1 ge(h 74hyrswfzb It leaves the bat with 7 fgyfh4fe2wt s(4h (-zb1lzr 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 accele chbqyddday5:v)2/: y ration, how does it change if ::/ c yd5qddha)b2 vyyair friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, p ys4b* l,tyx.how does it change if air friction CAN NOT b pyy .*l4xt,sbe ignored?

  An object that is thrown ver22nxfd bl(2+n; ze*eq cc ydg9tically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If airn+q2fcb *2gy(2l;e zx en9 cdd resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nou 5n66xtdf tv5nzero acceleration at the same time.

  An object can have nonzero velocity and scaoed a; *ly/yo /n1(49qroyzero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops fbk /db 89ci7keshe 65along 6e 75kb9di hc/ekbfs 8the way has zero acceleration all the time.

  A rolling ball moves froc5 x 0/-oz5 eung:jen0yf:clnm $x_1=3.0 \mathrm{~cm}$ to $x_2=-4.8 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completopl* i im fl)+9lwd)f2e laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainert,00md+b ge-ia 5hy5g o (upkz in a straight line, moving 87 m away in 9.0 s. It then turns abruub5 (go dik,zh-g5aytmp 00+e ptly and gallops halfway back in 4.5 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 frofud+d/z i4 14w8z.ime urj(msm $11 \; m/s$ to $25 \; m/s$ in 5.1 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 lqhvd k) wq-hvq191k28h0 sik a)a p,g$18 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o/ox9 qthy:c 7o./1bqt8fjvaa f $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter caof6 6pa-jsr1l n burst out of the blocks to essentially top speed abouf -oa6p 1jrl6st $10.8 \; m/s$ in the first 14.4 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 fro jx cedtx-h99+m a speed of $16 \; m/s$ to rest in 4.62 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car3(y 5nsp q; )ond(nssl.t p5de leaves skid marks 92 m long on the highway. Assuming a deceleray q(p esnds o .(3sld;t5)pn5ntion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going dsvy8sj,1: 4 xe10nch6acj l1 s9nqsp x*2wnx $25 \; m/s$ 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 10,0(: ,lhag*d:s7- xlcpgmou;d e 00-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner ma;dl cgh: xu*-g7:(o,d sp melust then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$