Suppose that an object travels from one po -3*c c2gljs5zqrqia 4int in space to another. Make a comparison between the d cqs5r*4ilj- gqc 3z2aisplacement and the distance traveled.

  When is the average velocity of an object equal to q t8i4hdq5ij: the instantaneous velocity?

  A new car manufacturer adv8aaw6in4pom c-km6195str i-b 7 olnlertises that their car can go "from zero to sixty in 8 s". Thistl8nbk7 9 45n16m6os apa lmw -i-crio is a description of

  An object moving in the +x axis experiencesq6- i4d gahqbzt f/g +yjictm8(4b8o9 an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x di ..g yqek-xi01+ryi7odmk )qzrection) begins to slow down as it approaches a traffic ligdzkk iri x0ogyy-).q.7 +mq1eht. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direcx gnmarz4.y5+ m pmqhre+(/j0fdgk(4 tion) begins to slow down as it approacjm04 .fgr4q rzn ((dm pmy ag5+k+exh/hes a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a5 2ej2hyxn v)p constant velocity. Make a statement concerning its aen25 yh2)p xvjcceleration.

  If the velocity of an objey:t 0s+ x9w im9cyaml/hz;tsp;8 vp.lct is zero, does it mean that the acceleration is zero? Support your answer with an exampl lsvmt+py9i9z0am 8x;;ych p l:s./twe.

  Can an object's velocity c-y i4:lvxqjj 4haj-ol8 2c0 qghange direction when its acceleration is constant? Support your answer with an 4oxjglv j:0 j hqcql2-84a iy-example.

  Suppose that an object is moving with constant acceleratj+(ksy*4icuspueh8g - dlxcy(v+j* + ion. Make a statement concerning its motion wig*4l (k-j (hpsx* cuc iusyy+edvj+8+ th respect to time.

  Can an object have increasing speed while its acceleration is decreasinq ox0a, bszpp;b 2,-leg? Support your answer with an example zl02,a-be,sxpop qb;.

  Suppose a can, after an initi-wc )b :adai:eal kick, moves up along a smooth hill of ice. Make a statement concerning its aca :edi)-bw:ca celeration.

  Under what condition is average velocity equal to the average of v-.qb thz9:n)2lrfdqthe object's initial and finfd2l:9)z-q rntv .hq bal velocity?

  Objects A and B both sta9x i+iz1d 7vqbrt at 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 vxiq7z +d19 ibobject A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the samh.iwxnon7 4u; e rate. However, ob;nho7iw x.u4nject A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from 1vd5p,-)uwqgt ni oa7rest and falls in the absence of friction, which of the following is true concerning its motion?,wu 57p1t-vaoindg )q

  When an object is released from hd)ej32ccim4s ft t.x x6.y1 brest and falls in the absence of friction, which of the following is trx2hsjd)b tcf1 3mey i cx4.6t.ue concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velvz0 jr qd7 20xvjn5w5wocity and the acceler5wwjjqvx052 z n70dvration when the ball reaches the highest point.

  Suppose a ball is thrown straighz /syk :zxs6:ct up. What is its acceleration just before it reaches its hs:ksx6zyc/ z: ighest point?

  Suppose a ball is thrown straight up, t :pi( .abopj.xz2 n6treaches a maximum height, then falls to its initial height. Make a statement about the direction o bi(..6z :x 2totpjpnaf the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches e9fg+l -plmxs4-pf n)a maximum height, then falls to its initial height. Make a statement about the direction of the vel9)4 lfgmes fxp+p --nlocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make+3a5,lx q7 r6wisnytqa:m(d m a statemes+7amdq( ia n:yx5,63r qlwm tnt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratqek 4qlo332p4uqkd9cd9f wj( l dxj7 9ion when shdo9(dkl2qwul 339eq fdpxjk74 cj4q 9 e she reaches terminal velocity?

  A ball is thrown verticall-um,+d:whukx0 1rafbu v nt( lb7a02ty upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast)u nm 2r1a:xvl-tbh7tu+f,a( 0ukd 0 wb. 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, bal0e9:dx*d;2 hbq1ftsc 6o fznll B is dropped from t*:z6 nlc d 0deft;sf91ob2qhx he same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, bai.u ;:bl 0b w u*wh.mtlx0rf.vll B is dropped from the same building. As time progresses0 0*ml f w:b..iubxtlurvw;.h, the difference in their speeds

  Two objects are thrown from the top of a tall build dbm e4qlx i*s.ax6,v-ing. One is thrown up, and the ob6.xix4qes m , -avld*ther 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 selmlda* 4hsgk xve7 (hayvs ;ew2 3p)8,cond brick is thrown straight down from the same building. They are release)g*l2p,dlka (xesem vyv; 3s 8w4a7hh d at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving w)vmi,i ba c*/ 3hqj:dlith constant non-zero velocity in the +x axis. The position versu ljhbd :iqic3a),m /v*s time graph of this object is

  An object is moving with constant non-zero acceleration in the +x ag9s 4i 742bbd;c2vrlodku: jv xis. The position versus ti kvb42;lbru27g49 idcov: djs me graph of this object is

  An object is moving with constant non-zero vv3e*:0 zerzy wt4mc i3elocity in the +x axis. The velocity versus time graph of this r3emz 3t y4*wi0ve z:cobject is

  An object is moving with constant non-zero accelerata kp o6w)u0k4jion in the +x axis. The velocity 4)auopw jk60 kversus time graph of this object is

  The slope of a positie: )aowv1 zjz+/d6u;;c g)h z*cmndhqon versus time graph gives

  The slope of a velocity versus time gra4*p* p is.v n2j2w9-l mrnnpcuph gives

  The area under a curve in an acceleratpjq) alsa*jg-:9la f1u8 pgq0ion versus time graph gives

  The area under a curve in a velocil ccr)ac tc-bi yl zo5u)3w-(+ty versus time graph gives

  If the position versus time graph of an object is a hxd; mk*law52s.ha4r x orizontal line, the object is.mdarx; hx*a5lkw2 s4

  If the position versus time graph of an object is a vertical line, the v57m-vdt s,m9ja :x56m iyc ppobject istsxmv cj7a9y,-v d5m5 mpp6:i

  If the velocity versus time graph of an object is a horiz /kox7/; 5adetwkeg 3sontal line, the object 3/ex a;tko/57kwe ds gis

  If the velocity versus time graph of an object is a straight s u871 ys/+t72a z b/atuojkytline making an angle of 30 degrees with the time axis, the object tusy a17jo sbak8/7yt/+tuz2 is

  An object moves 15.0 m north and thn8h;c1g d.ed len 11.0 m south. Find both the distance travecd1gel8.h nd; led and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it tak/ar , x.1o yrjzoc85;w. hsplqe to move 12 km upstream in a river fj1a zcprqlo ,o5hy.xwr/ s.8;lowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 (jf0*q 6fbhs x98ytm:/cjuq pm)

  What must be your average speed in order to trkl1g r;b ou/g0 evvd3 jb,ec4-avel 350 km in 5.15 h?

  A runner ran the mar0r dv-5ggi*gf1h upc/+je jm:f 9lam;athon (approximately 42.0 km) in 2 hours and 57 min. What is th 09f iujfjl1*r/mev p+g;c m:-5dg hgae average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tpbwmbo/kbu 4s6*c:4y dd/ c y,ravel 400 km?

  A ly (light year) is the distance that light travels in onemwu. o5o0lst /dmv+d: year. The speed of d:muo0d lo.s5/m+wtv light 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 alongx7rpepjo/;dbv b ). +h a straight road and you look to the side for 4.0 s, ).ph ovdr b;7jbpex+/ how far do you travel during this inattentive period?

  If you run a complete loop around an ou9hf, z)zv (dyctdoor track (400 m), in 100 s, your average velocdzhz ,)vfc9y(ity is

  A polar bear starts at the North Pole. It travels 1.0 k 6rlawe,79s fvdq0d;o2jjew8m 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 the7l,ee v ;8fw9r06djsd aj 2oqw bear's average speed?

  A polar bear starts at the North Pole. It travels 1 y .ns*/bx(psqr zgi :l+0fw3w.0 km south, then 1.0 km east, then b.*fgs/+ 3yx:rw wi np z(qs0l1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 (9qxc 5,gfo)votld z5miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. gzof9, oxdq( )ctlv 55How far is your hometown from school?

  A motorist travels 160 km at 80 km/h,l7w)36oqyz-/u y *mtrit zz w and 160 km at 100 km/h. What is the average spee lq6uw/ zti y-37mt*ywz,z r)od of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h k(twyl/;ha,wsk: mj : and 2.0 h at 100 km/h. What is her average spe:,/km t(;swwa hkly:j ed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mv0x 81 v5smmusel ug1):r n)hai/h north for 750 miles. What is the average e0nlu uarmvxhm ) v1:5ss8g)1 speed for the trip?

  In a 400-m relay race theh72auz /: *esa v9q qgecm0y7b anchorman (the person who runs the last 100 m) for team A can run 100 m in 9:q*e /7yasqcmv90h 7e gz2au b.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;al4 ljtl3sl* comes to a stop after 8 s. The car's average velocity during deceleration was 34 k *t3ll;lsal j4m/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 aveu,opa( /hh: tjtk3tw*rage rate of ,k*taj(: uo tpht/3wh$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate bkqb98vukx.0tbkv s wq. 95qzqv5( x2of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and acceleratbpch 3n/v09jx es 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 sgwyqm /q+.)x s (dn;z4*fr jof. It then speeds up with a constant acceleration q(xo +. mf/sqwr; nzfd4)y*j gof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.1 m/s experieyf;79;+y cfmca1 ddlmc 9ruf .ueur:7nces a constant acceleration o9f77 mcda .mcdr:r;uy1 luuc9f;+y eff $3.9 \; m/s^2$. What is the cart's displacement during the first 9.0 s of its motion?

  A bullet moving horizontally tocchf qjnq17 pkq)0 n;3*mtz;o the right (+x direction) with a speed of 313 m/s strikes a sandbag and penetrates a distantj;1 h);fcqm30qpkz n 7o nq*cce of 50.51 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 carr20;n; n2eavh6vp5dtos fe b6bier. 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 the catapult? s2b;nvd5n;t6e2pvfa e 0 ohb6

  A car starting from rest mowu ovlp)/dh etp1 bnp0hw59)mb4h1 h. ves with constant 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 avers t2c (fnjzw;8age accejc8 ztw(n2fs ;leration?

  An object starts from rest and undergoes uniform6 4k qpithf+j3,ssd 5v acceleration. During the first second it travels 4.6 m. How far will itvktssf+6 3,5ji4qdh p travel during the third second?

  An object is moving in a straighzn j/:l4-nulx t line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. :unz/ l4n -jlxHow far does it move during this time?

  A car starts from rest and accel(am1bej : ez8ri+ir(lerates 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 dece6ug3yyz -xim- :r5vy dlerate 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 trak8 hr9g*zfy 2p9v2 x)c6e cbmsffic light turns green, a car that has been waiting at the intersectionefxc92y sm)29k v8z b*pghr6c starts 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 upw+2p i97yvrq dmu t8i8oa+) odgard with a speed of 12 m/s on the surface of planet X where the acceleration due to gra9+aut g idyo+pm)o28q87vidr vity 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 th0y61 wmr pc)kye surface of planet X where the accelerapr610mc) yykwtion 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 sursg 36visb14pk)j o4erface of planet X where the acceleration due to )orp g bi64s134skvej 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 sur r(uq04l:z8djk,2wf qvp) ue5 o mjjx7face of planet X wheru7 (xowz:kp4m j 8je5q )qudlr,fv20je the acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usb(yv or e:(tx4ually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fally:bt(v 4(erox before you catch it?

  A ball is thrown upwardiidmxx2 -ss9 / at a velocity of 19.6 m/s. What is its velocity after 3si/ mx isx9-d2.00 s?

  A bullet shot straight up returns to its starting point ch4tx/bgxv5wx z( ).jb2z5nclal7w6in 16 s. What is the initial spew. cga5zv5l j tzx/2wb)b cxh6l (xn47ed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long doeslrqe23tb7 3dg it take to rgtr3l dqe7b3 2eturn to its starting point?

  A ball is thrown downward from the top of a building with an initial speed of 8 xnsqg -,,ia;m)am vv11 m/s. It strikes the grxa,iq gvns)m8a mv-;,ound after 5.1 s. How high is the building?

  A ball is thrown straight up wu: 4qy6 ss :pszj:q(flith a speed of 30 m/s. (only fill in numerical value in the blanks:6:u fysq:zj(sp l4qs )
(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 ua* kd8:1 p dgbhql;;ypp into the air with a speed of 35.7 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 - l8p (vout6bd)+bzp ps?

  In Fig. below, what is the velocitycx q *n-tiet04 at t = 2.5 s?

  In Fig. below, what is the velocita3u :lqho,h5zy at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.1pfgui4u*. lz ,ptjzlf t*2uh7 g7hb85 s?

  In Fig. below, what qgt(q+s 09ibris the average velocity from 0 to 4.0 s?

  In Fig. below, what is thpj 4ry,m0rj,le average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?4f mrezv-u *cw 5w3jm9

  In Fig. below, what is the accec vbs +;u)es6qleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 ubo(pi 4tm*eynj y sf282vx/ (s?

  In Fig. below, what is the average m.gbqay+n* +e 8yv6ru acceleration from 0 to 8.0 s?

  In Fig. below, what pui0zg0m5n 4dca, r v-zr(b*mis the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, v:3y2 ajvyy,0zoru)yz wc 7t ;telocity? {speed|velocity}

  An object can have a varying speed if ;s3iyb26lzwo its velocity is constant.

  The velocity of an ob/*j ttiee ;q)cject can be negative when its acceleration is positive.

  If one object has a greater speed than a second t 8g5 8xxep;quobject, the first must have a greater accele u;tp x5xe88qgration.

  Two cars emerge side by sink d aul60 pen1y5g:,jde 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 in )d+ ;avf4n 6zq: hlzn0pw.pnrgbeg4 ;speed as its acceleration decreases.

  A baseball player hisd9gwxa jq)2nwze d q+0.u 17rts a foul ball straight up into the air. It leaves the bat with a s g9q).1+du7xw snae d 20rzjqwpeed 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 sp0xm cuxc/:o5p eeds up, what is happening to its acceleration, how does it change if air friction is ignor5xu/ :cx0c pomed?

  As a freely falling object speeds up, what is happening to its acceleration, howljv6 */iysu*a7lv-ya rcn2gg9m b/ u; d6 *v /in2 yg 7galjv/yu 9smcb*;arl-uoes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return tsfev-t jmut)u;. j ;d;o its original position with the same speed as it had initially if air resistance is negligible. If air resistance is app dvjseutmf;-u.j );; treciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration atl+zunm z )4ui)41 flet the same time.

  An object can have nonzero velocity and zero acceleration at the sam nu:(xyp0wc p7e time.

  An elevator moving from the second floor to the fifth floor 8v br+c,e f;wmmaking no stops along c,wvrb8f;e+ m the way has zero acceleration all the time.

  A rolling ball moves fro8ksij + (1s0j z.5 wawi4ce:6itbjefum $x_1=1.6 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comy6p1dq;3hjb uwy(n +)m:eq cz lucwe(1a) r0nplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.2 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, drwrbht nej5-5+0 9rdu0 mtid1 ap4. imoving 110 m away in 10.4 s. It then turns abrupdtb dw5 im.t91erh4r ru0-jpa n+0id5 tly 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 fro mmoop0 nz41q;m $13 \; m/s$ to $25 \; m/s$ in 5.8 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 frow :b;6r8aau;* hzuwh*ps 8xj3vzd b3 om $19 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed cainh4ff8 3+ istb x(jbd13 -)mit0 haof $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can bu+pjv0x*o f3 l)cyi 0d(bscn l ,no;s58emj6hqrst out of the blocks to essentially top speed abou0clbf 8*o 3nph xj6 n0+qeo(c;dslsm),j5i vyt $11.3 \; m/s$ in the first 11.8 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 uniform . l, uk ,mcpj.0q*eshc2n6cni jbdw6;ly from a speed of $18 \; m/s$ to rest in 4.12 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a cpx4.v0j nxoqs( v, 0laar leaves skid marks 92 m long on the highway. Assuming a decel jlpxn 0v4,s (qxaov0.eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr9mke wmmrc8wwfzol at.0(,- g p2qf*3 uck 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 minek k)wedu f6*9. After exactly 27.0 min, there are sti6fk d)keu9w e*ll 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?    $s$