Suppose that an object travels from one point in space to another. Mafj9pqm1( 8rq gljl;f q,xx17 jke a comparison between the displacement and the distanr1j;xq(qjlqfgpx7 ,fl8m9j 1ce traveled.

  When is the average velocity of .7gwilbc. x4 9sy(mn+ k2oxkuan object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zvr-b 3z7aihb /t.2 zlnero to sixty in 8 s". /-b.rn2haz lv7tb3i zThis is a description of

  An object moving in the +x axi:wkwj uk5)u3cs experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+xk80ud.2i itl cb3ksg( direction) begins to slow down as it approaches a traffic lig.u3 (k c20lkisdti8g bht. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dowsh(jguaa0 + hdtghx:/y)0 9kfn as it approaches a traffic light. Make a statement concern y0 g 0s/:(aajg+tu dhf9hxk)hing its acceleration.

  Suppose that an object is moving with a constant velos ml 0eeby0ha0( g/r- fj-.uzucity. Make a statement concerning its acceler0fzbj-hse-umy a 0.er/l 0u(gation.

  If the velocity of an object djm 0bf kkw)61is zero, does it mean that the acceleration is zero? Support your answer wwfd mkj k)61b0ith an example.

  Can an object's velocity change direction when its acceleration is constant? d sdh-5 enrmfn,gfd-0w/i9 8f Suppordmgdn d,5n9 h/8r-fsff ie0w-t your answer with an example.

  Suppose that an object is moving with constant ac,he;4eh qw2dw f(vmu6 celeration. Make a statement concerning itsfe,hhd(ww4 6vme u2 q; motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing?)8bnbjgk.7kf; t hj vhs/p), f Support you.ft )sjvp )k8h f jknbb;/hg,7r answer with an example.

  Suppose a can, after an initial kick, moves up along88 +dvcy/xzqm a smooth hill of ice. Make a statement concy+d v xc8z8mq/erning its acceleration.

  Under what condition is average velocity eqj1 2 )gfq lxic2tvmwi03y(ba;ual to the average of the object's initial and yv3jqg2)f(bt 0i la i2x1m; wcfinal velocity?

  Objects A and B both start at rest. They both rl2eacz ..j43y)qclj accelerate at the same rate. However, object A accelerates for twice t42z)acrclq j.3 .yjl ehe 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 theo3tq8ayu+ x- n same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by ob+-x qotayu83n ject A compared to that of object B?

  When an object is released from rest and falls in the absence of1doudgtrvw g,r+9q/2ggq g, y 7bepd.sv/ 07j friction, which of the following is true concernind d, 7q,j pguor/d./7qb s0yvg +g9v 1ge2rtgwg its motion?

  When an object is released from rest and fav/l74zc hug2alls in the absence of friction, which of the following is true concerning /vlha7z2 cu4g its motion?

  Suppose a ball is thrown straighle joxr2 h3zfoha u755c w06(rt up. Make a statement about the velocity and the acceleration when the ball reaches the highehare350cjwrh x 265 z(7l ooufst point.

  Suppose a ball is thrown st34 hjuph7n ,ssvw6bc9 raight up. What is its acceleration just before it reach37bscnpvuhh4 ,9w6 sjes its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls t-e l 3cckc.w)qo its initial height. Make a statement about the direction of the velocity and accelecqcw).c-3el kration as the ball is going up.

  A ball is thrown straight up, reaches a muuo ia.uxt 42a qp.,n.aximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as upt2.x ao,u4a unqi..the ball is coming down.

  Suppose a ball is thrown downward in the absence nurntz, pjg(6.r 2 h1z/) mf3keil)t wof air resistance. Make a statement concerning its k) gt.in 3/n61jz)p humtr(we fzl r,2acceleration.

  Suppose a skydiver jumps from a high-f)w b 4qujxj3k5p,tg -fdg5y) /dmpkk 3lying plane. What is her acceleration when she she reaches terminal velocity-5 px43jtk wgk/y bkgd, d))mf 3q5puj?

  A ball is thrown vertically un;9:n7mai (gxlydu h)pward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fasydla:gn(hun )9 xm;i7t). 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 ttz6 z4e 2-7mj r0pqskyhe top of a building. One second later, ball B is dropped from the same building. As time pro r4jtmk72 z qs6ypz-e0gresses, the distance between them

  Ball A is dropped from the top of a building. One second5rw+,r 7opi+p hjfn.+ u.qdf d later, ball B is dropped from the same building. As time progresses, the difference in thei p ,r+o pihndd5+7wf.j quf.+rr speeds

  Two objects are thrown from the top of a tall building. fg+;+ldob h5a One is thrown up, and the other is thrown down, both with the same initial speed. What are their spel5g od+af;b h+eds when they hit the street?

  A brick is dropped from the top of a building. A second bricv(scciuf99d* k is thrown straight down from the same building. They are released at the same time. Negcfcd9(s9u *i vlect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity w2v:((ja *w5yioyx a-:sgomu in the +x axis. The position versus time graph of this objjwwvux oy5a*smyig-::2a ( (o ect is

  An object is moving with constant non-zz yo;4-bqnhn( ero acceleration in the +x axis. The position-n(;yzhqn 4o b versus time graph of this object is

  An object is moving with constant ne hg gnm.9;xf0d. 7smjon-zero velocity in the +x axis. The velocity vehmjnd07gx;9s . efm .grsus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis.edalk8t9 j ai1s) +f z:swg(4y The velocity versus time graph of thiskli1gz esa( +)da:ty j 8f94sw object is

  The slope of a position versus time grap)der. 8 ggqahrl19wrrv b;) m5 nl+odzq1d6,oh gives

  The slope of a velocity versus time g t1rgk 1b ;:: mkb+r,,rqhablus2eg7eraph gives

  The area under a curve in an acceleration versus time graph giveh cf4fsz):vp7s

  The area under a curve in a velocity versus time graph 4c6ng 3wp(av 9iswvl7 gives

  If the position versus time grapb-hdka/dt3( le9cd l k:t4si 7h of an object is a horizontal line, the object isht- d t(kdc7k:49 /abild e3ls

  If the position versus time graph of an object is a vertical line, the obje-gdml0m7g0e/z qqb,ect isqeb-m /l,m07zq ed0gg

  If the velocity versus time graph of an object is .oxu dr7sh5t vyd-g,9a horizontal line, the object i -x7 .59t yg,sorudvdhs

  If the velocity versus time nm5fxt;3hv: xgraph of an object is a straight line making an angle of 30 degrees with th5vt;xfhm: xn3e time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance travq;aoo/bto.p : xa3,xyt r 4l4gmp,*jseled and the magnitude of the dp/y.ol a;grajs mb o4t:,,4txq3 o x*pisplacement vector.

  A boat can move at 30 km/h in still water. How long will 8phu7gske(a x3+zwt1it take to move 12 km upstream in a river flowing 6.0xut13e(+k p7 8wgazhs km/h?

  55 mi/h is how many m/s? (1hdt3x xat0 1whz;9k:,d*ylh f mi = 1609 m)

  What must be your average spe6 mm+s mmre.:yed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.(e-xad 8; ;/jg* *gtwggnxg.g nxj 0jk0 km) in 2 hours and 57 min. What is the average speed of th;j.xgxj;(*gxedggng0 n*8-g / wtka je runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 nbeey4w5 7c h;c;x9 ynkm?

  A ly (light year) is the distance that light travels in one year. The spe if5q 3,0/)toplufqf aed of light lfpf3/t0) ifoa5q qu,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 straightf y ns-- du3z;j 5c;1hekup,q4g0 dbgu road and you look to the side for 4.0 s, how far do you travel during gnj5dhs0 3- ;z1gf d qpubyueu-ck,; 4this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your2gnyp3: ;yi2 k- it4; zwc who,3kolpn averag 2ho2kitk ywn,y-pl z3p;n:43wcio; ge velocity is

  A polar bear starts at the North Pole. It travek;, sdz4v,rvc1o b/o3 :tnxhtls 1.0 km south, then 1.0 km east, then 1.0 km north, then 1., to ;v: 3n1xb4vzrt,ko d/shc0 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, then+w/qd-m)-b r n ddjh*a 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)d+- / *wbaqdd-mnrh j bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles.e,p v-ku 4(lgp8(ghd g It then starts to snow and you slow topu ( ghkge(l4d,8 -vpg 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 at 80 km/h and 160 km at 100 km/h. What i wm 0;sbg7mv9ws the average speedg 9bwv;0wsmm7 of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 k)p.blrg;-v kvguush3dl,)o/m/h. What is her average s)l/b3vkp )o, dgr.sv;gh-u ulpeed for the trip?

  An airplane travels at 300 mi*a a2dz(zs9of vt/vo5/h south for 2.00 h and then at 250 mi/h north for 7509std5voo /*faaz 2 zv( miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) k,y 2 /ufe8/ rup2rgc :2chb7l1ylaoqfor 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 largb/7yolpucg82qr1 u 2, af:kc lehr y/2est 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 unifor+p : b1oeurqr d;*pc 2izj8u-zmly and comes to a stop after 13 s. The car's average velocity during deceleration was 78 km/h. What was the car's decelerati*uqzcjdpi 1 bu2+o-r:ez ;p8ron while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of-cjc)e .ap;n1p - eiwsjdf2gjcm1 l (1 pm- c2(1)ce f n;d.jawjl-sj ice gp11$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acvch n0v -6(gimcelerates 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 accelerates at 57-si czdla*+ x(umtd$4.0 \; m/s^2$ 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/yiy:uyi 1y) +yqat4o6s for 10 s. It then speeds up with a constant acceleration of y) uq4i+1yoti yy6a:y$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.9 m/s experiz 6be/trv f,o8)gm*jjences a constant acceleration ofj),ve8 zgbojmf6 /r*t $1.4 \; m/s^2$. What is the cart's displacement during the first 8.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed z*d)tpl 22, sovq mny2of 376 m/s strikes a sandbag and penetrates a distance of 79.39 cm. What is the average acceleration, ,)vdy*qs 2optl 2nm2zin $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catd (qp2lbnvfp 50)u*,dp9 mx:+f fochtapult 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 acce29 ff)0 up5hol+nbcd(,p*qdtxmpvf: leration is constant, what is the length of the catapult?

  A car starting from rest moves with constawf-d53u g: fti g yjnm-h3q;d7nt 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. What is its avera0abc1p* sj:o ft/ochr+upwv/-e 2n. kge accelerati kcs1/*b/tva-hpjc:f n.rp0ouo+e2 won?

  An object starts from rest and undergoes uniform accel-i.zqg tztdx/v*.6myrm +-fz eration. During the first second it travels 6.2 m. How far will i zfzvt tmy* q rm.z.ig-x6-+/dt travel during the third second?

  An object is moving in a straight line with constant acceleration. Icbpnj/ru 5*g36rga 01p 2 q2uv5eumsynitially it is traveling at 16 m/s. pr e ug1v yr*0muajg23 /n2uqc5b5p6s Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest anw)0 lmegzb6y :d 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 v-rra.t1icnvj2 sep4p: .e:adecelerate 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 traffm+vq ) eg;.xpzic light turns green, a car that has been waiting at the intersection star m qp+;gv.z)exts 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 thysm325pu0 kwl e surface of planet X where the accelerationpymku05l w2s3 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 thdcx2z nvceoeh9t2(: 7 e surface of planet X where the acceleration due to gravity 79d te2nxz:c 2v ecoh(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 ) rn1ubnc3ogof wsl63 z/k 95wof planet X where the acceleration due to graco)/3g nw1 rw3k9bu5 slonz6fvity 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 ofsaz0r8* vga 9i planet X where the accelez9s 0i8ar* vagration 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 th cq sn-*e2r8twan 0.10 s. If your friend holds a ruler between your fingers and rete2 *-c8 qwnsrleases 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.7ia2j5h+8 3(e 2z:dx oc4p xtaqnzt xm What is its velocity after 3.0ac:7handjzx28xq4ez t(i 2x p3t+o 5m0 s?

  A bullet shot straight up returns to its starting point in 1te1(b 0k,l soeq9k2q o2 s. What is the initial speed of the buloqeo0l k k,qtb9es1(2 let?

  A ball is thrown straight up with a speed of 36.0 m/s. How r9cblm.uxxl.(+i dy ,m62 ypglong does it take to return to its startinmgyb(c . i9x2p6.lm ,lx+dr uyg point?

  A ball is thrown downward frommo66g9uip (xz ,e(qy m the top of a building with an initial speed of 7 m/s. It strikes the ground after 2.7 s. How high is m q ,9ugizme(6 yxop6(the building?

  A ball is thrown straight up with a u ftu6645rlmixsny78 speed of 30 m/s. (only fill in numerical value in the bla sxu5i8nf7 l4trm6yu6nks)
(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 a speed of 473yd6ghgcc7 v0mo/) 5s ecjux4.6 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 t8kug ng8c-vkw0)om2 s?

  In Fig. below, what is the velocity a,b ( lc k8 );:ol8tfaye/vmllet t = 2.5 s?

  In Fig. below, what -9gi qti ) bikkxyaa,3zq52*o 9)jmqv is the velocity at t = 4.0 s?

  In Fig. below, what is the 5(c q 8j iathh97g5jlovelocity at t = 5.5 s?

  In Fig. below, what is the average ve.gm/sz .b1wmt7w z;4ph:yt -jze m3iflocity from 0 to 4.0 s?

  In Fig. below, what is the avx9onb mfh(s9 p)azs/p h:( y-cerage velocity from 0 to 6.0 s?

  In Fig. below, what is the accele k(yx2 3q(nrdoration at 1.0 s?

  In Fig. below, what is the accelhi i50 5*mno3b9rsiqferation at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 siq d ,jub2p,(s?

  In Fig. below, what cri7r8-* d l94j8sbv l,awekg is the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.xp0 0+z yvdp*jq3- lgz0 s?

Does a car speedometer measie:gitd ib 5z,bxgz (,)1amm5ure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constan5)- fhcc x(r v.l-)pf +wzzyrjvsrl +2t.

  The velocity of an object can be negative 9c.jznpga rn8bp(l5 8e5fy 8 awhen its acceleration is positive.

  If one object has a greater speed than a second object, the fi82sw0xr) uhotrst must have a greate2t hou)w xr0s8r acceleration.

  Two cars emerge side ccq12.urhj h4 by side from a tunnel. 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 ilqnx 4g9)hjn c :u1sw(n speed as its acceleration decreases.

  A baseball player hits a foul ball straight up 3l;o4cml/matldebb5. ws.4 w q9ima )j9dh ,iinto the air. It leaves the bat with a speeddt9bq e, )l;c samll.w io9a j5dm4.4mi/ b3hw 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 accelerationm yz4l. 1+ kebjpuo/c x24nc(d, how does it change if air fricti(4zdncy2 1m k4pou j.xbc+le/ on is ignored?

  As a freely falling object speeds up, what is happening to lawnax ,9;dt457sl*whqk. dpits acceleration, how does it change if airdwwhltqd5 n4p . *,7x;a9lska friction CAN NOT be ignored?

  An object that is thrown vertically upward will retur iu;2iq)cgx,i n to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how ,)q; iicig2u xwill this result be altered?

  An object can have zero velocity and nonzero acceleration a5q.kv; l ggl (+k3ztwat the same time.

  An object can have nonzero vc7t kz ,mog1y.elocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no st*kqgi * notu 0ei g*amk+m3o zo9 dvm4e+4a,3jops along the way*jotag3 emzoq**v m + kna e4 io+m9g40u3idk, has zero acceleration all the time.

  A rolling ball moves from4nfjt l+gsewf57dq9 3 (z5o 0bhaqc4u $x_1=2.0 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mbf7(frvr q i8/ile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 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 strn4h6 -*hx.pkn : -.trucg flpeaight line, moving 113 m away in 12.2 s. Itxpt ge-cn-: hk*4pn.l r h.uf6 then turns abruptly and gallops halfway back in 4.7 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 from5;cdro yq-bln - p2)*u:zelqc $11 \; m/s$ to $23 \; m/s$ in 4.7 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 frol4d:si/gw ,w i,5ryrmm $21 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ,mlndl3ickf8j(8 qiwd0q+m4u fvp 5f re 6d-8a speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the ); 1 .axmov(pqt.emon blocks to essentially top speed abou.axvm;) oq. tno1e(mp t $11.3 \; m/s$ in the first 13.7 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 fl id) rg2sst40rom a speed of $16 \; m/s$ to rest in 4.83 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 on ty.g*zq:i- 8v e/kt mhr5hv*i7r1 wfx dhe highway. Assuming a deceleration of tr:q. g xif*z5wmh18yrd*kh e- /vv7i $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truxg9bx 7+e+ kzt7r rfo*ck 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 complete the 10,000-m run in less than 30.0 min. Afte( imdw,d h4spf )wdzb446;tmnr exactly 27.0 min, there are still 1100 m to go. The runner must then accelerat4ndw6mt4 4h,)b diwf pz(ms;de at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$