Suppose that an object tr -nf 3irx2xq5d8qps qpr*r5s r.vl m)9avels from one point in space to another. Make a comparison between the displacemen3pri q8qsv5 l*mdn2-rp)qfx r5xrs .9 t and the distance traveled.

  When is the average velocity of an object equal to the instafw0u/u9;qqot r r3n+kntaneous velocity?

  A new car manufacturer advertises that their car can go "from z.6x lcmo8e**wezf*u2k e; nf xero to sixty in 8 s". This n xluo x*;z*e fk*8eewcm2.f6is a description of

  An object moving in the +x)t5 /k5 wrnxsx(j 1od21hwu af axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directigc+t3 g,7,0zfc6g ghbjcb; rzon) begins to slow down as it approaches a traffic light. bf3;7,+ 6g0zgjc,c h ctbzggrMake a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins a y9zb zfm.x7rmqwz45p1cg 14to slow down as it approaches a traffic light. Make a49m5zrxgc y 1mp b.1a4qzf zw7 statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemen)4j4zhqoz g5 a t6s.;a/rfp iat concerning its accelz)ps.a5 /6gzoiafa j;t hq44reration.

  If the velocity of an object is zero, does it mean that th t+2gwr gscgjz*iq 25* n6ay(te acceleration is zero? Support yj a*w*q265s( 2gg ctrz+ti gnyour answer with an example.

  Can an object's velocity change dix:4 h0a0ltyazxjs ;1 (7qpnn yrection when its acceleration is constant? Support yop4ay(hyx 0atnj q:7 1xz0 ;nlsur answer with an example.

  Suppose that an object is moving with constant acceleration. Make ag vvfv9d9 ctky1cd+n2l;r). f:;jpln statement concerning its motion with respect to:j fvl29krvp1 c;ygnd lv+ td;)fcn.9 time.

  Can an object have increasing speed while its acceleration is decreasing9blpg1 5oyil5 ? Support y5l ypl9 io1bg5our answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Makb ::uish eeut(;;v7jse (es 7ivb;:;ute jus:h a statement concerning its acceleration.

  Under what condition is averfe*rg.qjtf-toa k+ 7 5age velocity equal to the average of the object's initial and final vel e7q t5.* g-fatjrfok+ocity?

  Objects A and B both start at rest. They both accelerate at th6my5mt 9u x4zs y1jyj- f04m8yjdh5pfe 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 objeyj -yf 054 mj 1hz6j58 4uy9tydsfxmpmct B?

  Objects A and B both stargfm ,ua.;o ir5t from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled byo5rmg i f.u,;a object A compared to that of object B?

  When an object is released frobgm-g x ,yr3ts2 7 b2hri*va9mm rest and falls in the absence of friction, which ,mya7gb3 v2-*b sr9ith xrmg2of the following is true concerning its motion?

  When an object is relearuroqc)klc3q 3 9s-r ,-amk t7q xd91ssed from rest and falls in the absence of friction, which of the folldmxarsu k 3kqc)o7-q-cs19r ,9 ltrq3owing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a stax3vi8.tu9 brjtement about the velocity and the acceleration when the ball9 tri8x3 vju.b reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before av--nzw )cu/i0j0p q wit r0c/pz- uw0vn qawj-) ieaches its highest point?

  Suppose a ball is thrown st pk7d b, .oxhremr y/9(*tx;wzraight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction ofdp ,z.9;o7/ybr xtw* krh(emx the velocity and acceleration as the ball is going up.

  A ball is thrown str+ 2mt: 4mgo6.5i0 eyfrtw pbjgaight up, reaches a maximum height, then falls to its initial height. Make a statement about the direct+m4 y6b wpr:teijtmgf g0 .52oion of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downv 14mu-6s 7(o bjfijmqward in the absence of air resistance. Make a statement concerningob s4vmiqmu1 j f7(6j- its acceleration.

  Suppose a skydiver jumps frown/ -v eho 6nq2:yu0fw2wjx-mm a high-flying plane. What is her acceleration when she she reaches terminal velocv:w26mn/2h -ewjwf0 y xqou- nity?

  A ball is thrown vertically upward wid7 -qyxw ka/t*th 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 secondyw/*7- dxa qkt 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 builvkia e,z88ge(ding. One second later, ball B is dropped from the same building. zk8e(i eg8a ,vAs time progresses, the distance between them

  Ball A is dropped from the top of a building.i4 6rhuog.w(n One second later, ball B is dropped from the same buildg un4h .rw(6ioing. As time progresses, the difference in their speeds

  Two objects are thrown b0.ygqgu96 iy from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds wheny by9uq gg.6i0 they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straj :aye,9 sqod*lbfwgtr48)0j z85 azyight down from the same building. They are released at the same time. Neglect air resistance. Cfw)84ozgst r0 9y:58aj, dez yb jl*aqompare the accelerations of the two bricks.

  An object is moving with constamo;noc4p ,w(x nt non-zero velocity in the +x axis. The position versus tim4;nm,woocp ( xe graph of this object is

  An object is moving with constant nonguwtevtja)62d 6qg4z6 sc i3;-zero acceleration in the +x axis. The position versus tscv6u2z646 etwtg d ji3ag);qime graph of this object is

  An object is moving with constant non-zero velocity in the +x axislg5*i/vm lkc* vqde 64. The velocity versus timec5mvigk *v*/ edl46ql graph of this object is

  An object is moving wptqn4n :m0l(ee-v td+ith constant non-zero acceleration in the +x axis. The velocity versus time graph of t+dv:lte( n4-nqe tmp0his object is

  The slope of a position versus time grah nt*-ym piq7 .(4o5e0ysvyz oph gives

  The slope of a velocity versus timex nbqo0jb4r11vq 0 .hjidzjdoj l;) *5 graph gives

  The area under a curve in an ac1hpflai zem iu 4/1u-+h y-s+zceleration versus time graph gives

  The area under a curve in a velocity versus time graph giveu o 4vhppr:(b4s

  If the position versus time graph of an object is a knkg88 +3 bgvrhorizontal line, the object is 3b8g8kkgvr+n

  If the position versh9b b a-h(:lluiyf5/ sus time graph of an object is a vertical line, the object is(5hyahs bu f/b :il-l9

  If the velocity versus time graph of an object is a horizontal linehi - ,a(l)2hb4pm oodo, the object d b -2hal)poo( ,m4hiois

  If the velocity versus time graph of an object is a straigh oy x84vxyw8xqal942kfvpt3/ t line making an angle of 30 degrees with the time klvp4a82 4/9vxto8qy3xf wxy axis, the object is

  An object moves 15.0 m northo6ikdp-s*1vqd 4omv 3 and then 11.0 m south. Find both the distance traveled and the magnitude of the dis6vms o3q1-4od dv pk*iplacement vector.

  A boat can move at 30 km/7s d.rrd.v tw,h in still water. How long will it take to move 12 km upstream in a river flowinrws.7d,r d tv.g 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m,:+zs5 xg9xv oiz mmzl k:ao+8)

  What must be your average speed in order to t8r1oy( 6pcvno/ tuygsmq7;v, ravel 350 km in 5.15 h?

  A runner ran the marat ff rr 5ri7drjan(.n/.hon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner inr(57../afrrdinnr fj m/s?

  A car travels 90 km/h. How lg n9 g,, kgpdrv)-zl3aong does it take for it to travel 400 km?

  A ly (light year) is the dis pvg ();pipb ch-*kg5rtance that light travels in one year. The speed of li*gcv )k h5-;(ipgp pbrght 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 straig9qhhid w.3 jhs: y9l1cht road and you look to the side for 4.0 s, how far do you travel during this inattentive3d hs9qy1h9:.lj iw ch period?

  If you run a complete loop around an outdoor m6/p(e,pwbnzf *h (2l3fgrj d track (400 m), in 100 s, your average velp3hg(lfp/wm6*bzd 2 nj( f, reocity is

  A polar bear starts af;y hvi)a9 r)nt the North Pole. It travels 1.0 km south, then 1.0 km east, the;af ny)hi9v)rn 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 speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, thlu 0-6rhnu2pc en 1.0 km east, then 1.0 km north, then 1.0 km west to retu2-cl 0u urnh6prn to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from schooklztp/lc )5hyx pr 114l at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home af)t1 h1zk4lrc l/5xppy ter 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 twz;2ns.se0 iwuux p42he average speed of the motoris 0we2 snz;su px2uiw.4t for this trip?

  A motorist travels for 3.0 h a-+ mz+ +jvwnrdt 80 km/h and 2.0 h at 100 km/h. What is her average speed f n++jwdmzr+-vor the trip?

  An airplane travels at 300 mi/h south for 2.00 h and thenoccm+z5apgto k5;p 65 at 250 mi/h north for 750 miles. What is the average scgt 5;zp o65coa+p5kmpeed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) nvlbb 1+m4 oh+97mvjx 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 A runner starts the final leg of the race, in order that the team A runner not lose tmh jxmbbo 1nv+9l4 7v+he race?

  A car decelerates uniformly and comslogs) u2 +7mkes to a stop after 9 s. The car's average velocity during deceleraomkl2u) +ss7gtion was 52 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 avey6k.* cs5mflo bmj ;jx*;t/c)ca+k mdrage rate of o* mj6xt)5ms*+c cl ; jf.mdbkacy/;k$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates 4nnp6;ongh 7yf lq1:y 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 (cp84myuo0 2 1oko p0ehxe)eyaccelerates 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 con u4m3wjjh g*u)stant acceleration ofjm)jguu4 hw *3 $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.7 m/s exvu5t 3 +bx5 ndzg;t/5lyh +1dfpnp(dkperiences a constant acceleration ofxht53/zd vltn 5d+(g+ u;npk1p5yb df $2.4 \; m/s^2$. What is the cart's displacement during the first 5.0 s of its motion?

  A bullet moving horizontally to the r7lt5j29 ppj +zlv68ieidf9 ozight (+x direction) with a speed of 323 m/s+j p8p9 v6f52lzo9 djz lieti7 strikes a sandbag and penetrates a distance of 74.29 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapulc0 * ;jjj:(-o2wjl rrr;ikm5bqmo s0 zt on an aircraft carrier. It reaches a speed of 42 m/s at ti2; ro m*m:j-rk5jl 0bws0 jjq(o;crz he end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleratii 3-8wmqc0o+gtkrn1q on 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 5m+f*hxv r9 mhits average accelerrfh9 *+mv 5xmhation?

  An object starts from rest and undergoes unifot9ht/k)yqv ,s rm acceleration. During the first second it travels 8.2 m. How far will it tr9h y)tsv,kt /qavel during the third second?

  An object is moving in a straight line with constant acceleration. Initially itu s(fkw7pd* tu7b*a k4uqy4w ,ts7fj3 is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does s774uqp k4*w(f w kjdt*3ut 7 ,syubfait move during this time?

  A car starts from rest az8aurj f w)m;2nd 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 canz-wqr,qx:4 sn8g0s urj w8ch.;b uq:m 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 : g-s;hmwf 6ddturns green, a car that has been waiting at the intersection starts ahead with a constant acceld6 :dg mfhs-;weration 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 surfadrut x+d;8j32 2q u95knocab qce of planet X where the acceleration due to gravity is 8 udun+2 2d5kar;ojbqqx9 c3 t$1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwarw-f4ngbxk( ) rd with a speed of 12 m/s on the surface of planet X where the acceleration d(f4rbgxw - nk)ue 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 spee,698fhqkp;o w x3q(gq7.flp0 yuvvqad of 15 m/s on the surface of planet X where the a;a gu pfqkxfp3(8h. lv6o0q,9ywq7q vcceleration 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 nbyeakg z/n gknt7z)x 5g9yq7,/ (u3psurface of planet X where the acceleration due to gravity is zq/) y nypnn 7u5g3 ze79kbk( ta,/xgg$3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend ho.)bgolb* lri. lds a ruler between your fingers and releases it without warning, how far can you expect the ruler)blrigl b. o*. to fall before you catch it?

  A ball is thrown upwadftw; sc(n b(1 2t.f0*r* auhwpbmps5rd at a velocity of 19.6 m/s. What is its velocity after 3.00 sa (fm;b2.pn(*w fh*pc sd tbs 1wut5r0?

  A bullet shot straight up returns to its starting point in 17 s. c4ov ov8 ntdt .2jd/)zyrzy14bb i,b8 What is the initial speed of the bullvb y.o 28 8r4/41oznitv,jt d)d yzcbbet?

  A ball is thrown straight up *3 d2edw-bzr bwith a speed of 36.0 m/s. How long does it take to return to its starting *zwrd-3e bdb2 point?

  A ball is thrown downward from the top of a building with an initial speed of(bxu /u(quqv0+quki - 15 m/s. It strikes the ground after 4.1 s. How high is the buildinguiqxv+(bq u 0kqu(u -/?

  A ball is thrown straight up with a speed ofks* nu(2() h yqxcdy9yfqk-f 0 30 m/s. (only fill in numerical value in thesqhdy 0yfc(*9xyk)n -(fk 2qu 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 airv ;wxxj.6 tdndd6*mu eg1/ac+ with a speed of 37.6 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is thlnhj + py aj+)gde*jz443h, xie velocity at t = 1.0 s?

  In Fig. below, what is the 2bz9 ,xyuph6q velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 c z+ )nek t4(8ja)nsjvs?

  In Fig. below, what is the velocity at t = 5.5 s?66mdlc7/;,otbmqwv s

  In Fig. below, what is the average velocity from 0qe l63kvz ))n (chq0no to 4.0 s?

  In Fig. below, what is th mphxa lgr5h*6e55 w;ne average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration 9*r .b519nqysqjecetat 1.0 s?

  In Fig. below, what is the acceleration at9 mgmeh*f)*hf 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5p t8 ul8tpft)).0 s?

  In Fig. below, what is the average acceleration ,fe e1tl yof*se7 ag(dd-38gtfrom 0 to 8.0 s?

  In Fig. below, what is the displace+/,ej/a wbizd ment from 0 to 8.0 s?

Does a car speedometer measure sp4 vgiu z5g6 ((cfsg/f:qxf.u geed, velocity? {speed|velocity}

  An object can have a.u c-970bq 6j1*,tkiqx zdzbzxkl n0heuo3 r) varying speed if its velocity is constant.

  The velocity of an objej-d8w,obqcg8 n).oe f/cx-:suo)sl k ct can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a4p3ur , g:brysb h4v)lsu5e/k gre ugrpbu:5 k 3)v4rsylhse4,/b ater acceleration.

  Two cars emerge side by side from a b 5bc hw)8a2o7dmna+0 zka n.itunnel. 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 accelerati50ww 0tfdzx, son decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the dev7 ,v22c mko 3z6)3dym p8mrrtn2 orbat with a speed of 3,m c2y d)2mrv8o mz3kte2r7 6porvdn$120 \; km/h$. 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 z+o; jwaka0g/q*cymv4 p 1t, nspeeds up, what is happening to its acceleration, how does it cm* 40ptygj;vzo ac1 waq+nk /,hange if air friction is ignored?

  As a freely falling object speeds up, what i drxu6 u3g4q-ys happening to its acceleration, how does it change if air friction CAN NOT be ignore3qr udygu4x 6-d?

  An object that is thrown vertically mh )juh2a0h wya0u3be1,bhs9 upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance iuh h )3bmj1b2h0s y0h,9uewaas appreciable, how will this result be altered?

  An object can have zero vel,+l hqb up0d8 .rqw m 80awxwg4qynx.3ocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleraov p9bf:g9kc6 tion at the same time.

  An elevator moving from the second floor to the fifth floor making no stops arj,3- drxr tt5nlu -h5long the way has zero acceleration all the trrhx3t,ud 5-5- tlr njime.

  A rolling ball movests45k88dbgcse2 u * vn from $x_1=2.4 \mathrm{~cm}$ to $x_2=-6.4 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroujqzx 3ubjzk*i (-tld; h (x4g:nd a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 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 zkv8/mq54y o: c3b 3iib whzq:straight line, moving 110 m away in 9.8 s. It then turns abruptly and gallops halfway back in 4.7 s. Cal wvh kb/4zmib3q3 iyoc: z:58qculate (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 fr7d:r1l/bkdjbiw s6vv 0 su4 +6zhjhk1om $11 \; m/s$ to $23 \; m/s$ 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 fromd*-p x*yohb4m2ay2 i(n uewk, ey7 qq( $23 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacsmdpz*u:yi6g )u2 p)zm0 wnc*h a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprintn2sxmd00iq dd66q k -ver can burst out of the blocks to essentially top speed about k0x ivs6q-q6 d0nd2md$10.7 \; m/s$ in the first 14.6 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 from a speed of b*o+0pg:on7 tche dj4 $20 \; m/s$ to rest in 4.33 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a c6bdf*k;-a1q5/zaf ei 5mdcw lar leaves skid marks 92 m long on the highway. Assuming a deceleratiofe i6 cqz/b;5dwlmka5d 1-af*n of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi7b*5d xzub:puf-, z4 xm2m*1faz 7rpnd 1ynftng $25 \; m/s$ 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 rc 0sbs fy- qk o+ vzgmfzsem1-(xb:6((un in less than 30.0 min. After exactly 27.0 miz(:f- xqv+6 yfbcb (s-ks( mz g0me1osn, there are still 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?    $s$