Suppose that an object travels from one point in spacee e 9cp(h wh4l0-+vcqh to another. Make a comparison betwee(0+h4-cee chph wvl9qn the displacement and the distance traveled.

  When is the average velocitym , ts /s2(3kl myl6se31tcxmm of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that theibjz/1i kbfur32a: cy1 r car can go "from zero to sixty in 8 s". This is a 1ibujy c1 :a2fbkzr 3/description of

  An object moving in the +x axis experiences an accelera8 u7tej19/g tmcer zwh7 pd5(xtion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directi,v nszkq3)vttf );c 2n+ei *fron) begins to slow down as it approaches a traffic light. Make a statementv s);)e+ 2vi,z3fntqfr* cnkt concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down ziz9xk5dx.m 6as it approaches a traffic light. Make a statemi6 zxm.dz5 9kxent concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemenqyq+9ow)prb 5yfijvnk(y -- /t concerning its awr9yf--y + jv(bqykpni q/) 5occeleration.

  If the velocity of an object is zero, does it meaz(h xyl w(1h9an that the acceleration is zero? Support your answer with an example.wyz91(( xha hl

  Can an object's velocity change direction when its acceleration is c r15om3w 7a:qq4f mrjq:8 .jjfc9vmlk onstant? Support your answer with an exampl 18q 5 .cf3q rmvkmwar749j:qjofj lm:e.

  Suppose that an object is moving with constant acceleration. Makij8-x-ua o0qo q** c* dhlvnanzky8* d;la6*pe a statement concerning its motion with rez yn* ;c8av*oa6l-dx80oh qiqjn*kup-*lda*spect to time.

  Can an object have increasing speed while its acceleration is nsel2upcy,m(fub1 e/- e +ek7decreasing? Support yob+ pue2mc,n-y 7k s/e fue1le(ur answer with an example.

  Suppose a can, after an initial kick, moves uh dyh*hh9w+dy7zn( ;up along a smooth hill of ice. Make a statement concerning its acchh ;u7y*nw dz9hdhy(+ eleration.

  Under what condition is averag5s5o9l* b,n dbda)x gae velocity equal to the average of the object's initial xdb5ng5 *sdo9lba)a, and final velocity?

  Objects A and B both startf/m4qnhqo k7 mmbpuvj951n 3 * at rest. They both accelerate at the same rate. However, object A accelerates for twif qo4ukm953pm hv1m*bjq7n / nce 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 5vao+ ao t-hdtv6cjb5 95,drbaccelerate at the same rate. However, object A accelerates for twice the time as object B. What is tbvb+ 5j d vt6r-atd5o,5ha9c ohe distance traveled by object A compared to that of object B?

  When an object is released from rest4to bmee06-zyvb(72yaa 4ac o uclpimx7t) 32 and falls in the absence of friction, which of the following is true concerning its mozi ayt02)tem v (o-e m6px2bloc44y7a7 ub3 action?

  When an object is released from rest and falls in 3vdo lvg mb;ud25z1(g the absence of friction, which of the followin5d ov12m 3;gvzudg(blg is true concerning its motion?

  Suppose a ball is thrown straight up.hi4o9f /x dx:w Make a statement about the velocity and the acceleration when the ball reaxio/wf4:x 9h dches the highest point.

  Suppose a ball is thrown straight spbp ;n2;-qdde *;ovc;dd7ksup. What is its acceleration just before it reaches its highest pointdc;nsdq7 p;k po2* ed ;-;dvsb?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to iz jw+/4khqa5l0n e3up ts initial height. Make a statement about the direction of the velocil5/0pauze qj +4k 3hnwty and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heightg1. 8cqs:bpas9g+h t3thf /)qemq b2g, then falls to its initial height. Make a statement about1. 9qtg g8htbpa2/b+ q):eh3gfcsqsm the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make 66twge sq2 df+5qzjz .a stateme.j g w5 q2fs6t+6ezzqdnt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wha07(fudhidz3rx11c0hno m m( et is her acceleration when she she reaches terminal velocityuizo ehdnmmc07f 3h10r( dx(1?

  A ball is thrown vertically upward with a speed v. rka,(;oe m bt;a 86.uzkk fsd (1qch4xAn 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 ball go than the first ball?dzkas 1c4r t ;hm;((xe.,aq8uk6bfk o)

  Ball A is dropped from the top of a building. One second lad+ 6os;bv5dtkter, ball B is dropped from the same building. As time p+dv;65k od sbtrogresses, the distance between them

  Ball A is dropped from the top of a building. ctbbpvbfl e+ 74u03 l5 One second later, ball B is dropped from the same building. As time prog4f u7cebbl3 lb50+pvtresses, the difference in their speeds

  Two objects are thrown from the top of a tall building.rrxswrfpc i/vni 7+) bm)+ (z7 One is thrown up, and the other is thrown down, both with the same initial speed. What are their spee )si/wcx7r+i)z7 rnbp m+vf(r ds when they hit the street?

  A brick is dropped from the topn ne-3j gly1 g2r* zho,47mxnp of a building. A second brick is thrown straight down from the same building. They are n37olzg1je*pm 4,h2 ryg-n xnreleased at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with0-cfvogb /sl x piw066 constant non-zero velocity in the +x axis. The position versus time graph of t6xbpfv iw6l -00/gc oshis object is

  An object is moving with constant non-zero acceleration in the +x o t ,s7m/xz4js vp;z+iaxis. The position versus tis4+mzj i7z s/;,vtopxme graph of this object is

  An object is moving with constant non-zero velocity in;* hwh.o)cqt l the +x axis. The velocity versus time grql).;cw t*hhoaph of this object is

  An object is moving with constant n:qg4f+ong i2 son-zero acceleration in the +x axis. The velocity versus time graph of this object isfg4i+o 2gqsn:

  The slope of a positioy-z74d.ty qtwn versus time graph gives

  The slope of a velocity verw6j why )3uk2*;xpph;rx 8nidsus time graph gives

  The area under a curve in an acceleration versus tim n07qv0sl k;rl;qg7khb 7p6 lde graph gives

  The area under a curve in a velocity versueu3uwh9j*4+iuh gwa x 97/djr s time graph gives

  If the position versus time graph of an object is a hod4z( ihe;9 / coyuryh7rizontal line, the object iseyi9yhhc(o7 /;z4udr

  If the position versus timei3jn37 ss6v3o(i sda h.r 8hia graph of an object is a vertical line, the object isondhh.ai 33 v j73 s6rsa(8sii

  If the velocity versus time graph of an object is a horizontn,pe *m-itt i.al line, the object isen i-,.t* timp

  If the velocity versus time graph of an object is a straight line making an angln ksna/5g 0gfcwa+m3(e of 30 degrees with the time axis, the object iss+a3n a5g0c(f wnmk g/

  An object moves 15.0 m north and9 en8al- e)ona then 11.0 m south. Find both the distance traveled and the magnitude of the displa-e9 nlna a)oe8cement vector.

  A boat can move at 30 km/h in c 4s:vtj/ee.i3k 0 : vdq7ycfxstill water. How long will it take to move 12 km upstream in a river flowing 6.0 ki e.7k3tdv0 /xsvq:yfej:c4cm/h?

  55 mi/h is how many m/s? (1 mi = 1609 mq 0pk+vlby3*fse 3wt+ )

  What must be your average speed in ordz tz k) /ez+a0mcwxn77er to travel 350 km in 5.15 h?

  A runner ran the mara;mmh1:l2f u auhsi 96crb e+l2thon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m22 bfe 6u;1hl :mcu9ma hl+irs/s?

  A car travels 90 km/h.ry)nji 9iz +9rowdb st c75j(5 How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one81mwnbbi,xjz, r/-3 qe ( romf year. The speed of lig8-fjr1b oxe /minb,3w,(zqrmht 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 straigg+1,jevo;gao cs m:5rht road and you look to the side for 4.0 s, how far do you travel during this inattentivero+ ogm s,jeg;5ac1 :v period?

  If you run a complete loop around an outdoor track (400qk r*fhpk,e n+zq9) 5wvs .u3j m), in 100 s, your average velocity pzkqf,)rs*+e5 kjquwh3 .9 n vis

  A polar bear starts at(j(p0cgbwa b1+8 uc nt the 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 (wtcaun( 1p08 bc gjb+to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the Northtpd +*:im9x3 ntofzrgv :1z9w Pole. It travels 1.0 km south, then 1.0 km easzv dp: :9trwmxt9n fgioz*31+t, 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 velocity?

  You are driving home on a weekend from school v u56)e-opfveat 55 mi/h for 110 miles. It then st)5 -vefvp uoe6arts to snow 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 km at 80 km/h and 1606,kmtms vm)*v v7f8t q km at 100 km/h. What is the average speed of the 8t mkmf)6v7v qv*t,sm motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2. 7t6mn jmwjz120 h at 100 km/h. What is her average sj 2z7nmjmw16t peed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 25xncxy 5n, l45e0 mi/h north for 750 miles. What is the average speed for th,5exx5l ynn 4ce trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) fo- rs c2; mixv8efbn2/wr 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 8mw-bxenis2f 2/;c rv lose the race?

  A car decelerates uniformly and comes to a stop after 11 s. The car's averco8nx4 ynk 2,27i6faayay yr:age velocity during deceliyka224a7yof: 8x,ya6ynn c reration was 62 km/h. What was the car's deceleration while slowing down?

  An airplane increases its sghxgkuz xdx(, t: werd:6y+)0peed from 100 m/s to 160 m/s, at the average rate of 0y xrgtd:h ,dk(ug)z+6:xw ex$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratemb -g9da7ytjk7hj0i * 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 rest5;d tm1i9y)oa/q zler and accelerates 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 upib rmz:: lq72s with a constant acceleratiolzibm rqs: :27n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial veloctp2 1j rl9:minity of 3.5 m/s experiences a constant acceleration of :p1jilm2 r tn9$3.3 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed w:3w0 jsa fus7of 299 m/s strikes a sandbag and penetrates a distance of 22.17 cm. What isj0 :s3s7fawuw the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launco lvb-i shhz32n ;ii+2hed from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this reb3 zvlsn o+-iih2;hi2 quires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with const,ii8e7n9roz m78w k a6:;xv mesz;rrkant 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+ dh;wk/8b m+me5rr om to 80 m/s in a distance of 200 m. What is its average accm+h5m o +rr8bw d/;ekmeleration?

  An object starts from rest and undergoes unifor8y ;guilo 1u1xm acceleration. During the first second it travels 1.7 m. How far will it travel duo8 x1 gli;yuu1ring the third second?

  An object is moving in a straight line with constant accelerationgtw8czg)pruyg487vq s 1+ k6s. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move dutu8gpg81zgk vss 6y7 +rq wc)4ring this time?

  A car starts from rest and accelerates )h2p6k:vz0elx p nputh *g,u aqwu6c p:: w,n-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 rolt.w qoz, 40huad can 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 turns green,,g1i nr95og clssb- 38lkbw5 s a car that has been waiting at the intersection sta sbbsnscgr-l3 g5 w, o51i8kl9rts 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/6s0favxe 4v v. vbd):us on the surface of planet X where the accelvuvxfs0vb v). d 6ae:4eration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown w: f(,uva7ta+ s/bzvsupward with a speed of 12 m/s on the surface of planet X where the accele,vf +bw7s :(tvs/auzaration 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 j1g25nfryxs ex6z:(t15 m/s on the surface of planet X where the acceleration due n xzx:g6y 1efj 5(rts2to 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 sry8 af)at z9l;peed of 14 m/s on the surface of planet X where the acceleration dura8 z ya;9lft)e to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually ) iq1sp0nbc*ggreater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the0n* qcsp)gbi1 ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its vela9 u;xfy;-femvlg jj09i x8l )ocity after 3.00e-xxa9 ;yu jl 0m89gi; jlfvf) s?

  A bullet shot straight up returns to its starting point in 18 s. Wrvdh w 20unjrp /*1u4ahat is the initial speed of the bull1up 4w/rdun 0hr2vj*aet?

  A ball is thrown stra6 f;mil3sp;ja ight up with a speed of 36.0 m/s. How long does it take to return to its starting p;fjsli ;a63mp oint?

  A ball is thrown downward from the top of as8os.( a6eyzztw;h5g building with an initial speed of 8 m/s. It strikes the ground after 1.8 s. How high is thetha;( o5.gsyzzws 6 8e building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeco-k/z5ajcspmkvnd3i1 c5cc , r) , i*rical valui1) i,m,occ/dsccaz*5jcp-nr v 3 kk5e in the 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 in axq4m esrk2snq un 98.riju4yzf-8++to the air with a speed of 45.3 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity atazlp towav o2m.u.9, 1 t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.+ alpzos1 )r4m5 s?

  In Fig. below, what is the velocity at t = 4.0n/xcm w/8sl as8g95 lz s?

  In Fig. below, what is the velocity at t = 5.5 f3(8utc 2vf3 pph6l- shvxf3n)l jwb) s?

  In Fig. below, what is the average velocity from 0 to 4.0cqp q.,*f gw/b s?

  In Fig. below, what is the average velocity from 0 to 6.0 s7x8gcm ;+ .koyqip a:eoks4 :m?

  In Fig. below, what is the accelerab)n:yge 3p;h)2 kwpi ntion at 1.0 s?

  In Fig. below, what is the acceleration at ixlwzgl**bv421zx.gnm(h 6 hd : ch/d 3.0 s?

  In Fig. below, what is the average acceleration 55yqmm qv bjpobmfc65+c)1 bl4) o)dg from 0 to 5.0 s?

  In Fig. below, what is the average accvj:-c5dvfb 2+ hl0 xow.blbm;oe :m, releration from 0 to 8.0 s?

  In Fig. below, what is the displac * vs0mb+:6an5bc,cmbnwi7 wqement from 0 to 8.0 s?

Does a car speedometer measure speed, velocitj 2gs3zvg.su.5xv:sx y? {speed|velocity}

  An object can have a varying speed if its velocity ii np)*r, o-piqs constant.

  The velocity of an object can be negative when its acc bp+1jm )rme7.huu2,p glr5tcs *cj)peleration is positive.

  If one object has a greaa (dscla5x2h) (qnm 16ga3qmi a hfo:6ter speed than a second object, the first must have a greater acceler1qgn q)ham (:65adci23ah f6xa(l msoation.

  Two cars emerge side by side from a tunnel. Car A is traveko6 a:f9u71co ll a-vvling 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 inf hl.c0im) jbh7yh0kw4fxz7. speed as its acceleration decreases.

  A baseball player hits a foul ball straight*bhs az*1q f-0qm5sr r up into the air. It leaves the bat with a speed ofq1ssf -*0bhm r5rzaq* $120 \; km/h$. 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 acceleration, xjp9 -(jkutc-,h5kmphow does it change if kk 9puc h5-j(- p,jmtxair friction is ignored?

  As a freely falling object speeds up, what is happenip50i(wq;7 nqk jj-f njng to its acceleration, how 7j fj50;qpin(knj -wqdoes it change if air friction CAN NOT be ignored?

  An object that is thrown vj,8 xuop f czis3.ieu) v7x(k,ertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If a co, (73fxpzk uvjuis)ei8x ,.ir resistance is appreciable, how will this result be altered?

  An object can have zero velocity and noxefq8j/2wjlnohw9kh , gqdx9 - mb1 5+nzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleratyqm o*l8;7w lnion at the same time.

  An elevator moving from the second floor to the fifth floo od; ytkfax l 3yvr;/o64v.bu.r making no stops along the way has zero acceleration all frxbl . k;.6d;avo4/y 3t youvthe time.

  A rolling ball moves 9rq718v* *v5z,bzqfwalc ) fk4eu fi 3dbev2ifrom $x_1=2.3 \mathrm{~cm}$ to $x_2=-4.2 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ 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 $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cdp r 0m/jew54vz.,nocomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.9 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 straky61msx;6 t+io l2p bf;-jx nyight line, moving 100 m away in 10.7 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its avl m 6x;fb jx2 ;+61isyyknp-oterage 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 frodh.-nv2brd :() e tkpum $11 \; m/s$ to $24 \; m/s$ 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 fromywq jxgb- 3.u;ds1 fn1 $16 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed d)euxnnv:wkgu ;v 5ot e 4-3+5+kfitpof $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top spaw40hlr3m77ian1nk-b k1 a lceed aboui 1k 3aakh7mbnr7-n01c4llawt $10.9 \; m/s$ in the first 11.1 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 sx;u44ibqk7so9iu7zn.8l bp1u 7vh ta speed of $15 \; m/s$ to rest in 5.40 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavex9nxp cps* tw si*0-m7s skid marks 92 m long on the highway. Assuming a decetxppw7-* misc n*0x s9leration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goii(kbt4ho/8s kng $25 \; m/s$ 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 com1k8 yq5duq btsy;n1hf6a )3hkplete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, a61s8; yt qdfynk1hu5h bq3)kthere 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?    $s$