Suppose that an object travels from one p+lquttq k2 4 u.**zrdeoint in space to another. Make a comparison between the displacement and the distance travttl 2quq.4+ke**zdu reled.

  When is the average velocity of an object equal to the instanh:kj 7v:2 irxwtaneous velocity?

  A new car manufacturer a4+ koei+lz n,tdvertises that their car can go "from zero to sixty in 8 s". This is a deszeln io++k4t, cription of

  An object moving in the +x axis(gy;no 7d44ww -ijz ow experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow jsx;tk q* jf52down as it approaches a traffic light. Make a state ;fqjsk5xt2j* ment concerning its acceleration.

  Suppose that a car traveling to the West (-x 8wa+o7r f*majdirection) begins to slow down as it appr7w*+ma o rfa8joaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant veloci/;-;xpr( cpzinzb r;s ty. Make a statement concerning its accrzcr(-;b pz;; ispn/xeleration.

  If the velocity of an 8c ;w2iq m-,gvpcr6*wi gk2j:byfkc+object is zero, does it mean that the acceleration is zero? 8cw ipb ciwr2k+ky*gf, 6jq;:2g mcv- Support your answer with an example.

  Can an object's velocity change direction wh.zn )(4n vzmyqen its acceleration is constant? Support your answer with an4 nz(m.q)v yzn example.

  Suppose that an object in2+/ e;zjncxc0hm u/ws moving with constant acceleration. Make a statement concerning its motwnujnmce/+xhc /;z2 0ion with respect to time.

  Can an object have increasing speed whia +c0 /nejgq88no)h bdle its acceleration is decreasing? Support your answeqdanbn o8ec8 h+ j)0/gr with an example.

  Suppose a can, after an initial kick, moves up along a smooth hi/6hng; khy i:tf nq9 kmif.r 6;,t.ebmll of ice. Make a statement q6nmm9: ;nfi bf ktg.ty, hik;./h6erconcerning its acceleration.

  Under what condition is average velocity c 1*syv*o+w0 aqk/cx*4wr ctkequal to the average of the object's initial and final velocqvk*syc4/w*0 ac*1cxo kt+w r ity?

  Objects A and B both start at rest. They bot vj(;m+qr*hd4)lka g n6qw9mz0z/cs bh accelerate at the same rate. However, oq/*9msz4bz(0;cgjq+k aw h6mv rl n)dbject A accelerates for twice the time as object 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 raje 2dkg.4ob+m 9 x 80 o/qf9wq4bcoljite. However, object A accelerates for twice tqd4o/ 8jbejg oxm0wk2iqbl 9 f.4oc 9+he time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the ab*qlpnvk*: 6 qdsence of friction, which dp :l*n6v kq*qof the following is true concerning its motion?

  When an object is released fro 2 .*kjslt,l ex76wxy7o)7hslual fn;m rest and falls in the absence of friction, which of s6)u xkho77; fl2*lsljx ntl.y7e,wa the following is true concerning its motion?

  Suppose a ball is thrown straightsde y5cg *fxt:-4+tyw gv*lj- up. Make a statement about the velocity and the acceleration when the ball w 4*v -+j- gsc5etlyt*f yg:xdreaches the highest point.

  Suppose a ball is thrown straight up. What is itu;b5k.g rwc gjm5h/ ;bs acceleration just before it reaches its highest pointh;gg j .5m5bwkr;/ucb?

  Suppose a ball is thrown straight up, reaches a maximum height, -q x8q+v +,4ejsapbgkthen falls to its initial height. Make a statement about the dirv+-+x jakbq,pq8g4e s ection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, ul*c0-5iaki;ux hhy) reaches a maximum height, then falls to its initial height. Mak h k5xi;laihcuy*0) -ue 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 aii9l69z8,qf4c.qvwwly f 6 vekr resistance. Make a statement concerfv8 4w6kf9v 69wclql qie,y .zning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerat e;5o /8z;q + jp2 sl*qabrp-izu.yrreion when sh* o lyqeri2z.ear+qjpb8;surz;p- /5 e she reaches terminal velocity?

  A ball is thrown vertically upward w5gf8b*af8ouuq . l z,5ismot5ith 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 times higher does the second basqb, logu55t*mu5ff88 .ioz all go than the first ball?)

  Ball A is dropped from the top of a bv) .n 3tcxvl)i1 oi.oxyxex25uilding. One second later, ball B is dropped from the same building. As time progresses, th2cinxi v .)v y5t)xlo31xxeo.e distance between them

  Ball A is dropped from the top of a building. One second later;etizo9d , -pn yblbj h-f8dz(f6o,5s, ball B is dropped from the same building. As time progre d,l,obhd;-y89n s5( otz6p -jziffebsses, the difference in their speeds

  Two objects are thrown frommqhk3k-kin)rh8, ona3m 9 7x: jgbs4b the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What arek9 3h-,3gjanrkx7nhs8 moi: kbm4) qb their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straiv5cqt- c5tfx1ght down from the same building. Tt tfx5cqc v-15hey are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The posit./ u yho/dxemvu;b86 eion versus time graph of this object 6 vd/ue 8xm.;u/be yhois

  An object is moving with constant non-zero acceleration in tyux3uh 1t 0;1b4nymek; xogl.he +x axis. The position versus time graph m ;tgbo10y43unlyux ;1 .hk exof this object is

  An object is moving with constant non-zero velocity in the +x axis. The velk.vpeojtsl1*v 1,n-fv 7latm//1sh w ocity versus time graph of this ot fvshs. /w1 o1a7nlvkv-epjm *t/l ,1bject is

  An object is moving with constant non-zero acceleration in the +x axis. w8bc f gt,2a*j ppd8zpwz5:-r The velpdcw2 p*r-z bw:,5j pa 8gf8ztocity versus time graph of this object is

  The slope of a position versus time wxbn/ 8t 4s b.o7spj7(-focisgraph gives

  The slope of a velocity versus time grb-qws:*:xj) mjc.ghwaph gives

  The area under a curve inn5/f,szpu8x3/-8 m0km(n egfcq y rta an acceleration versus time graph gives

  The area under a curve in a ve )1s qcx-m+ uj;q (vv2eto5eqp1t ic6blocity versus time graph gives

  If the position versu *qphh2 *ofe.us time graph of an object is a horizontal line, the object is2qfu*ehp h* .o

  If the position versus time graph of an object is a vertical line,*vo)c-z5vyn b*:su xo the object is y* n)zvxu-ovbo*cs :5

  If the velocity versus time graph of an object is a horizontal line4 q5.wasm:f be, the object isb w.qe:5s4a fm

  If the velocity versus time graph of an object is a straight line making an nq 4dqksws813 angle qsq1wn 43s8 kdof 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trav 8ux3i tasx18(ch d+pe noj(;reled and the magnitudet +8(dox x npa3;hr1cu( 8sjei of the displacement vector.

  A boat can move at 30 k4wqr g t(89sesm/h in still water. How long will it take to move 12 km up8wsq(reg9st4 stream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =rmym0vn :88qz 1609 m)

  What must be your average sph8-j,6f als hf ju08x5p e3nwbeed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5did 4mj fsu,d bqd *88n*a,0*cywfh6v7 min. What is t*6*df d8,qsy,n bmc8vi*w fdjha0 u4dhe average speed of the runner in m/s?

  A car travels 90 km/h. How long d10n- bnmd rm1su.w3w soes it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in p12yf5a piqe;one year. The speed of aqpi21p 5;fe ylight 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 al/l z4;k27d5ualzernj bib ;cl8s0x t4ong a straight road and you look to the side for 4.00e2 uncs8rjixtk /;4 zd4 ;bzll l5ba7 s, how far do you travel during this inattentive period?

  If you run a complete loop around annx5:kynsh l5ej;+) sf:3):op ssgtk )hvf3ic outdoor track (400 m), in 100 s, your average velocity is:;5fp) s ny3:ct 5+h3ks))flks:xehov isnjg

  A polar bear starts at t gf 41;lezy:rvhe North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km w;elvrg :f1y4 zest to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at tho(jllfox,l 4928)b. lpfa0cbnui t, se North Pole. 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 average velocoiuxp f 9alot. cbb),s8(0fl4l2 lnj, ity?

  You are driving home .* 9jv vmds*vron a weekend from school at 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 15 minutes. How far is your hometown .*9vsvd m *jvrfrom school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the0y(n6q*ea o lgw -+bv26copwollz 5(m average speed of the motorist for this troqw(-z 0aool5lbp gm(cnv6ylw *2e 6 +ip?

  A motorist travels for 3. /xj2iru.t2qx0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed fori u2x/rj.xqt2 the trip?

  An airplane travels at 300 mi/h south for )vsumuln9k7 +.xc7k +bq/jd w2.00 h and then at 250 mi/h north for 750 miles. What is th9clwb /v dsq x7++.7kukj umn)e average speed for the trip?

  In a 400-m relay race the anchormawd3s;ov3w kjy+b8bvnu:;;g kn (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 B3;wg3 ydo+v; ; vns:8jkuwbbk, 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 11wak5pz o4x/.q s. The car's average velocity during deceleration was 79 km/h. What was the car's qx zwo5/ 4k.padeceleration while slowing down?

  An airplane increases its speed from 100 m/s 4yyb9 ,*f*mphnle z5tto 160 m/s, at the average rate of 495,n ehlytpzfm** yb$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/ha6iby*jb * )xj 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 an; :vo,jrsqbi8v .zu)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 then speeds up with a con0.ef n nf,1rbistant acceleration of 1f,fbn inr.e0 $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity ofy:lbxnk:44 nf 6.4 m/s experiences a constant acceleration of nyl4: 4:xkfb n$2.0 \; m/s^2$. What is the cart's displacement during the first 5.5 s of its motion?

  A bullet moving horizontallj,0nfz0 8d ublilk .y5sk +vu gcl.//gy to the right (+x direction) with a speed of 592 m/s strikes a sandbag and penetrates a distance of 90.69 cm. What is the average acceleration, 0k+unldg5b80gkvljsi / yfc,/.uz .lin $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an air ,-glh t6dgt,iq2bdo7;btg5 m craft carrier. It 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 th,i2qm ottg -btg5l h6d b7;gd,e catapult?

  A car starting from rest moves with constant accelerationmv y857zsnb 6d 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 m24y*. m+zxrqpaa n)sv. What is its average acceleration? xv)arq sa2mn4+z y.*p

  An object starts from rest and undergoes uniform ac0c+-e-p wrib m34t6d sji-ud uceleration. During the first second it travels 4.d6r t0im c u-eb-w3- pdj4+siu3 m. How far will it travel during the third second?

  An object is moving in a straight line with constant accelerao .k pzt3/ol2ytion. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this tiyzk32.o/pl to me?

  A car starts from rexf189 b siq:dnleha- qmc)9 q.st and accelerates 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 aybq4u p+ir9 bgzu fl94go1) h9t 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 mctu/( 7jx9( ii0qgjmfytyu 8j27t2i 29jtjzthe intersection starts ahead with a constant acceleriy2gt7 (ijj0yc j mtx2tt29(u7z mjq8f/ui9 jation 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 s 1f-le7ex8 lxopeed of 12 m/s on the surface of planet X where the accele87xe-1feollx ration 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 onx wkicsv.h7 *084d;j,7aq l vas8logo the surface of planet X where the acceleration du 8ov4h77ldcsa sw8a ,gqkx0il;o*jv. e 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 micnf,/hivubl 8qx+l)+1x2 fovf+g, z/s on the surface of planet X where the acceleration due to gravity isf, 2o8++xl1g xh,nf c+l/qvi vzbiu f) $2.5 \; m/s^2$. 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 X z2j2dmp:gn m:za ,l/q where the acceleration due to gravityzldaqzm gp 22m:/ :j,n 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. I1qj;. p5s-nlyce2 7n 0e8ueq qorbkp:f your friend holds a ruler between your fingers and releases it without warning, how far can you expect thy oq e:c;jkn se-lpqr027.ep nuqb851e ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 (nls9qcu( 0tl.,m( u ijhh-c+n(vbldm/s. What is its velocity after 3.00 sul(m.0n-tn9 (+ dv h uhjlc(lib(,sc q?

  A bullet shot straight up returns to its sta02zhsy,l pdw3ls +wp9rting point in 13 s. What is the initial speed hd32 p,0l p wyl9zwss+of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take tob p)p chiwv4bo+6*-ec return to e b)b p- 6pvccio4+h*wits starting point?

  A ball is thrown downward from the top of a building with an initiay)ng8e y8/2td.b weda l speed of 30 m/s. It strikes the ground after 1.8 de2/e8an.bg)yd8tw y s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (on f(c.h vo9m7o.l;r(ug7bzq3t c4pmnnly fill in numerical value in thfo(z 4;o7glc.n um( qtcp9h mb v3n.7re 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 straigb 2ypmi csd.1)ht up into the air with a speed of 28.7 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t o1/ lic)c)) tr6ww *r1i gq:ujbdz ,az= 1.0 s?

  In Fig. below, what is the :rdw 3r/;k mmv0 zh2omvelocity at t = 2.5 s?

  In Fig. below, what is the velociak0an +3mu au4sy2z*lty at t = 4.0 s?

  In Fig. below, what is the vug4 v-xzdbj47 /(eyvvi,(n; r twf*wqelocity at t = 5.5 s?

  In Fig. below, what is the avery 563q)x:,xs w8idt4awl,3ypxwwt m sage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to ug 3)m(4schjc 6.0 s?

  In Fig. below, what is the ::uywnbk:eouu n99 q/acceleration at 1.0 s?

  In Fig. below, what is the aq+broapp:63 rcceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 kzrd1pd*nr4 tl1.myye m4 ;e-s?

  In Fig. below, what is the avl7n r+o+fv9cd f)dn4puv 7m4mt2: eod erage acceleration from 0 to 8.0 s?

  In Fig. below, what * g2s3d ftgdlkfbe* 1*is the displacement from 0 to 8.0 s?

Does a car speedometer measure speez)5(kaxvvrs-w tzxs;zc /( y +d, velocity? {speed|velocity}

  An object can have a varying speed if its velocity,g:pb -c urti)fvbi24 is constant.

  The velocity of an object can be ne, j eisq,wygsn1);h3yh/w)g ud8.t esgative when its acceleration is positive.

  If one object has a greater speed than a second objav sbnp t w6w8uesli-+4-2hwqw,b7+lect, the first must have a greater acceleri-a+w,2p7 lw tb+-4 hs6wvluw nqebs8ation.

  Two cars emerge side by side from a tunnel. Car A is traveling w3fwqg4z c. /;epa z3gkith 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 adl rkd; rkyj1fs4fv,z ks(8jcj 95j9(cceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leavemu). ara +:o u uk.tr1xg7y(fps the bat with a speed tfu.u1go)7x :r(u. kaypa+m r 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 tob21ch 0yfiwslk f0qx9mr)0 s. its acceleration, how does it change if air friction is igno 0f h9w10 .m)fxsyi0lrkqbs 2cred?

  As a freely falling object speeds up, what is happening thjse h,9unyd(4pz,37 mr;hnko its acceleration, how does it change if air friction CA3k,us7hdz9 ehy,;(4n mn rphjN NOT be ignored?

  An object that is thrown vertically upward will return to its origina m9,jh7 bydj)al position with the same speed as it had initially if air resistance is negligible. If air resistance is apprej7 y)9bhjd,amciable, how will this result be altered?

  An object can have zero velocihkmr )m.qy00qty and nonzero acceleration at the same time.

  An object can have nonzero velocity svg:fr94f7c sy3zha p1 4 4cfband zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops m4b qk4ubo/ j5t0g+wualong the way has zero acceleguu/wo+m k 54bb q0jt4ration all the time.

  A rolling ball moves frbf(8kfe5k n7 qqx f95lom $x_1=2.1 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ 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 $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-x+ dtq(v2u5tgw 6yev +mile ($1 \; mile = 1609 \; m$) track in a total time of 6.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from itsxeib7z 4;o(hw(n/ vxl trainer in a straight line, moving 86 m away in 9.8 s. It then turns abruptly and gallops halfway back i4ehlxi 7vz;( w(onx b/n 4.6 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 from2hvmrqk2 s0g* $12 \; m/s$ to $22 \; m/s$ in 4.8 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 1vc :l3u* /g zyjjoj:e$18 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed obb :3f vmncq8u*c po94f $31 \; m/s$ 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 can bu u )ne8augxr9(rst out of the blocks to essentially top speed about exg 98 u(rn)au$10.2 \; m/s$ in the first 13.4 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 from a s al-empw(gf/4 5ty0g upeed of $16 \; m/s$ to rest in 5.11 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lct5l(5 q4/re7fgpz(jig w09g iqwk0zong on the highway. Assuming a deqfj(cgl 5pt5(00i zewrwig k4z/qg 79 celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckle.6+rz yg30y3r gswyt :6v hp( 2gvtr going $25 \; m/s$ 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 comple -ei+yst (ox6bte the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runnet-e( 6x yobsi+r must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$