Suppose that an objetbrz/u9mk (ws nzhj3 28w e6b9ct travels from one point in space to another. Make a comparison between the displacementbs e8u(/6n j wrkh2bz 99mtw3z and the distance traveled.

  When is the average velny :jsfs 0x7duw v)p.(ocity of an object equal to the instantaneous velocity?

  A new car manufacturer adverty0zf(ghr 7faet o hop8exug-/40s2a/ ises that their car can go "from zero to sixty in 8 s". This is a description0-t8(arfeoseouy 0zaf h4x7g/g 2 ph / of

  An object moving in the +x axis experien+ th ..iie5oiuces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car tjxuq )w0q9 b/draveling to the East (+x direction) begins to slow down as it approaches a trafu xq)/qj9b0dw fic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to thxnl.k5yk qtoeb(xc ;a /47u7le West (-x direction) begins to slow down as it approaches a traffic light. Make a statement coxc/5k oaq7 47(kylulnet;.bx ncerning its acceleration.

  Suppose that an object is moving with a1hca- .;k 0yzt ovucsyk5fu:* constant velocity. Make a statement concerning its accele;ycv*tf0 o-1 czkuhua5 kys.:ration.

  If the velocity of an object is zero, does it mean thaiio)ze ;vpy67 t the acceleration is zero? Support your answer with an example7e;yi6ziv)p o .

  Can an object's veloc n1tx3pqc8ii6(ld exc d.zh14ity change direction when its acceleration is constant? Support your ansd3 1cn(zxe 86 hq c.pixil4t1dwer with an example.

  Suppose that an object is mm*e0g9f xy c:vs ufl 8l9nb1i+oving with constant acceleration. Make a statement concerning its motion with re9 +8nf y*ivxf:elb01 msucg9 lspect to time.

  Can an object have increasing speed while its acceleration is decreasing .c nm3hyosj93? Support your answer with an examplojmn ys3.39h ce.

  Suppose a can, after an * msl6n4z3tbr initial kick, moves up along a smooth hill of ice. Make a statement concelbs36mzt nr4* rning its acceleration.

  Under what condition is average velocity equal to the average of the object's i-o *y1uxt*4b avf h:aah:cct,nitial and fa- c41a*co btyuf*vt h::xa,h inal velocity?

  Objects A and B both start at rest. They both ,twnz5r2plhe d u77b,accelerate at the same rate. However, object A accelerates for ,lzh52n7b7rtd,up w etwice 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 fn.rd1kvmq5mur/ r1zo1ov3zcxt5* 1 wrom rest. They both accelerate at the same rate. However, object A accele c/5k rqw3n1rvt dz.5 vr1u*1mxzm 1oorates 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 rest and falls in the absence of fricti( 8xhicecj1 4pon, which of the following is true hx4(1i jc pc8econcerning its motion?

  When an object is rele dz4w svc,v,*aclv b98ased from rest and falls in the absence of friction, which of the following is true concerning its mot w,9cbvvsd ,4l*v8zacion?

  Suppose a ball is thrown straight up. Make a statement about the velock2p;zx 3nu4c4u 2 1fh2inxz wuity and the acceleration when the ball reaches the highest pointfuuinp;uc x44zxh z312 kn2 w2.

  Suppose a ball is thrown straight up. What 8ggv95o am/vyis its acceleration just before it reaches its hiv95 gm8/o yavgghest point?

  Suppose a ball is thrown straightdobs(*3n k5;wsruv 3c up, reaches a maximum height, then falls to its initial height. Make a statement about the b(;3sonvuk*wc5s dr 3direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reacheswxdz7 xb2o((sc i-ow( a maximum height, then falls to its initial height. Make a stab7(ox (2cwo diws-z(xtement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown: eju6pc+/2j lqm-7fm u t(bhb downward in the absence of air resistance. Make a statement concerning its acceleration:f/pmbt h(ujme+qc6j 7-2u bl.

  Suppose a skydiver jumps frt3wvpd9 o mft:q.y)b4om a high-flying plane. What is her acceleration when she s9wotqfmd:b ).3pvt y4he reaches terminal velocity?

  A ball is thrown verticr:+.wtaz -lhially upward with a speed v. An identical second ball is thrown upward with a speed 2v (twl.ha: it+r w-zice 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?)

  Ball A is dropped from the top of ac)u1 ,skxj :cg building. One second later, ball B is dropped from the same building. As time progresses, the distance betweeuk1g)j , csc:xn them

  Ball A is dropped from the top of a buildbyp*eyme2 h+:fgwi7 ;ing. One second later, ball B is dropped from the same building. As time progresses, the di;y yw+ pem2gehb*f7:ifference in their speeds

  Two objects are thrown from the top of a tall building. One is thrmgcw59(aiqfh njq35-l43 i ksown up, and the other is thrown down, both with the same initial speed. What are their speeds when they c4qgniq hwsj95l 35mfi-a(k3hit the street?

  A brick is dropped from the top of a buijsb/xkhf-dht cx.be8j0a8 .4 lding. A second brick is thrown straight down from the stke.xfj8db4xh-s8a jh . c b/0ame building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constte91cba ,spz; x92je rant non-zero velocity in the +x axis. The position versu jseerp 19b9;a ,2zcxts time graph of this object is

  An object is moving withkhz-/ 6k:: wlkgwfoh ) constant non-zero acceleration in the +x axis. The position vers-lk) wg:k hhkof:z6/wus time graph of this object is

  An object is moving with constant non-zero velocity in the +x k8pfw *;kt:9 ek9b wxiaxis. The velocity versus time graph of this o:tk i 8xke;bf*kw9p9w bject is

  An object is moving with constant non-zero acceleration in the +x axis. Theqkye hz1 l1(upq.9 +qt velocity versus tiqteyk 1ql zp.(19hu+q me graph of this object is

  The slope of a positf zbe:s(zhaq car*+i3t- 5c+mion versus time graph gives

  The slope of a veloci(n lue1nuhp6p oe1 i ;v,0-sa +)yznbity versus time graph gives

  The area under a curve in an acceleration versus t5 a-l1lqguk5w ime graph gives

  The area under a curve in a velocity versus time grapj:bdo*fc(w08zik t c ;h gives

  If the position versus time graphze;ljqv */ 5dn of an object is a horizontal line, the object is v/n dl*zq;je5

  If the position versus time graph of an object is a vertical line5 1fjlgyo0m 1 vr+zz9k, the object is rflgokv 01z+j1m9z y5

  If the velocity versus time graph of an object isolvrq.yj, 4ph+5 gf) a a horizontal line, the object i q)4fgoyh,a.v5rp jl +s

  If the velocity versumn i1(sz 6rhaj)7(kris time graph of an object is a straight line making an angle of 30 degrees with the time7kr(m61hani rz)j( si axis, the object is

  An object moves 15.0 m north and then 11.0 nq t191n vpl*vusp3 bhm2,d(b m south. Find both the distance traveled and the magnitude of the displppq vd l9msth2u1vn,1*(bnb3acement vector.

  A boat can move at 30 km/h in s zuav28gqs f23till water. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?2 ugvzqaf 832s

  55 mi/h is how many +wlv:an)0p2/ uz ed1b lj6gqwm/s? (1 mi = 1609 m)

  What must be your average speedn : l;.oxgqu4q k708b5ilrhyo in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whatcx hp3:4( j8s vb5ph /b7aqcum is the average speed of the vc 8xsc :qph57(jmbhb4/p u 3arunner in m/s?

  A car travels 90 km/h. How long does it take for if h4n, kwd6 (0zy/wkost to travel 400 km?

  A ly (light year) is the distance that lightt4 3w.fkk: ieqw(d0 xx travels in one year. The speed of iw dxxt0(.k3eq: fk4 wlight 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 straight roado25j1;acgbj *qwwj (n42 fkzf and you look to the side for 4.0 s, how far do you travel during this inattentive periodzk( ;o2jgww j*52bja n1f fq4c?

  If you run a complete loop around a6k c3q j5hq .tcir72gon outdoor track (400 m), in 100 s, your averahc57qtcq3io jk2 . g6rge velocity is

  A polar bear starts at the North Pole. It travels 1.0 km: bm vtbyep m4em7qv1(g2*8hk south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its startpme: mevyh7v 14b*8kt( m2bgqing 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 southv+e;u quybdlw()jb)p2e ,i 0c, 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 veb2v(q y)wu)ec,l d;bi0e+ upjlocity?

  You are driving home on a weekend from school at 55 mi/h forw,as q;bm)(cm/a( qw jkzw1x1 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and c1;wmajq)/sq kzm bw1 (wx,( a15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/oj) h-wnt-. tw7(mui ah and 160 km at 100 km/h. What is the average speed of the motorist for this t -(- imhajotwuw7nt).rip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her ajtvzhc d:;mu+ a-0/drg w,p8n verage speed for th dv8zh /,jrcd0gwm nut+-pa:;e trip?

  An airplane travels at 300 mi/h southx)ug ox fi6(3vgs9ip; for 2.00 h and then at 250 mi/h north for 750 miles. What is the average36(u9xis;ivgxg fpo) speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the la/sqpd *mw8 w;nst 100 m) 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 runp m8 sn/;wq*dwner 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 kj-vukj9e6v mq,p;4.hx. oqm stop after 11 s. The car's average velocity during deceleration was 51 km/h. What was thv.hq,om-x evkum9j6p4; j .kqe car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to0my4dna *s13bh8 z7 id ge42 qjinz*nt 160 m/s, at the average rate of 1 24 hdb*3tj 8ninq0gse*a7dm nzy4zi$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thk 9fgil)5 4 2ghkipd0me 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/ u b;3ok(zcjsq8ult 2 $4.0 \; m/s^2$ 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 fq2n;;2 t:3z trk vkvvxor 10 s. It then speeds up with a constant acceleration;:rnkx v2tv 2k;qtvz3 of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.1 m/s experiences a con v (esr/ax(haov3h5cld*d)e /stant acceleration o/ le(hvdx3(a oe*h/cv )5asrd f $4.9 \; m/s^2$. What is the cart's displacement during the first 6.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with h)4 zq(s(( n kgnlfqhb3oss64a speed of 294 m/s strikes a 4kho ()q 6nl(q sz(g3 hfsns4bsandbag and penetrates a distance of 66.53 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is ly*ra4 6h vb7hlaunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuminvy r4l7ah h*6bg the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accele/93fvw9 fkfl;esp pl4ration 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 mzh 2mmdg/c ,k,/s in a distance of 200 m. What is its average accele,hgm m, 2dc/zkration?

  An object starts from rest and undergoes uniform acceleration. During the firsxbd5 rcauu(yk.o02;nn6a/ ai t secon(b o yaai; c2d0u5r u6.k/nxand it travels 4.1 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acc, yhoq3; spay*7dvvf ,eleration. Initially it is tra;o* sy,a ,h3v7f vqpydveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerat3 2 utnmt1)tkk* ck3q m3cl/tzes 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 ca 7cdj5:j/5abqclqn+ j 5hfu+ gn 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,5t-/qx ngtl w6cnt,e, a car that has been waiting at the intersection starts ah5 eg ,n t6/wx,t-qnltcead 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 the surface of planan:b ) m j/ d*2lf9ib)mtr+zqeet X where the acceleration due to gravity i zdmr/jb e+qba 2fnt*:m))il9 s $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface of 6cp9g 8mp8chok1 avqkg+0( qj planet X where the acceleration due to graqck(pa o+ q9v1m8g gh6cjp80kvity 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 thed.do;5j exn3* ajnc: p surface of planet X where the accexn5*jod: ap n.;cj3deleration 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 thengp*omyho.fy 6 /iu.0 b efn64 surface of planet X where the accelerationh f. 0uegop*iynfmb66.yo/n4 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 than 0.10 s. If your friend holds a rulq:3 7 tn fd3*ydhbf3wrer betwe h3 dndqr3t3f*yfw7b:en your fingers and releases 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. What is its velocityy3 tsa3l;bx-qq; u1 jk after 3.00 syl;13 t3 a-kbxsquq; j?

  A bullet shot straight up returns to its starting point in 11 s. o+vbs1f5io-p What is the initial speed of the bufbp s1+ -5voiollet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long dobhnz j0o oxz7l59k*kit02 qe ,rfb d.7es it take tobk7nl* b09ofxet0hjoz z.,qd2 5 r7ik return to its starting point?

  A ball is thrown downward from the top of a building with an initial spqgok le(b+vp h66lo;;eed of 23 m/s. It strikes the ground ob;v6l q;ople6( hk +gafter 7.6 s. How high is the building?

  A ball is thrown straight up with a speed of ii .y,t( 2 ywfrq ncc;.q1fudt4g h0h/30 m/s. (only fill in numerical value in the blank4/uqf2.qr y(hc0dwc ,.i f1 nhttg;iys)
(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 thon tjoci)/(i /ssqsaf*/5n )n1r( ajce air with a speed of 32.0 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 the velocity at t = 1.0 s.lv kw 4 wig*iq2pxo)3?

  In Fig. below, what is the velocity m 8z:zb6uk/caat t = 2.5 s?

  In Fig. below, what is the velocu:hr)5b8 im ic-w(lo lity at t = 4.0 s?

  In Fig. below, what is the veloxn0j,;y lv 6 lwq0yx8tcity at t = 5.5 s?

  In Fig. below, what is the average velocity f 9q c3sju5xwv9rom 0 to 4.0 s?

  In Fig. below, what is the average p6dy,07 d l90zcyizlc velocity from 0 to 6.0 s?

  In Fig. below, what is the accnvjl(b1q0. r deleration at 1.0 s?

  In Fig. below, what is the fl c7/c1qtb8xo o .+ooacceleration at 3.0 s?

  In Fig. below, what is the av.inzn-aa xy //erage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tod6v ..et 1+9osaly mgq 8.0 s?

  In Fig. below, what is the displacement from 0 to 8g nkd/p2vq 6)q7vr v(z.0 s?

Does a car speedometer measure speedtzt , pk3vf97o, velocity? {speed|velocity}

  An object can have a varkxr we(gjb4 kivzdbi+ 578 5s8ying speed if its velocity is constant.

  The velocity of an object wbv*7i62: e (du4nn 5x ,f0wcbh;3xq dcdawio can be negative when its acceleration is positive.

  If one object has a greater speed than v-tt(o-ck:r za second object, the first must have a greater acc-tvocz r(tk:- eleration.

  Two cars emerge side by side from a tunnel. C iv-3pj8kt5iorpmor 5)k8 o.har 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 increasin/d+ hd80gxxefso*n l, g in speed as its acceleration decreases.

  A baseball player hits a foul b;dkfw )vf;il 5all straight up into the air. It leaves the bat witwv f5ifdk;;l) h a speed 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 st,yu8mvyd2p a, ,bm4object speeds up, what is happening to its acceleration, how does it change if air friction is ignoreb4 y2 d,s8yvp,am, tmud?

  As a freely falling object speeds up, what is hapku2q(gxt;q * vpening to its acceleration, how does (vgquq k;*tx2it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origibdn5q7 db tw,;nal position with the same speed as it had initially if air resistance is negligible. If air7d 5qdntwb ,b; resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelerk x01vv- n2ep mlshy29ation at the same time.

  An object can have nonzero velocity and zero acceleration at the same timnsy.:e5shf;pk yoy.vx y 5w( 8e.

  An elevator moving from the second floor to thq1i;nzxdxhai,+)a82kt ev * j e fifth floor making no stops along thxi +vk) 8jazhtd1e aqi,;2n*xe way has zero acceleration all the time.

  A rolling ball moves frb vfx-+7js cfetlq, mhp;(+u ;om $x_1=1.8 \mathrm{~cm}$ to $x_2=-6.1 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps f26 ,wrcbl8sshvgk 6tk+yqn 2v44yv+around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.8 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 linezyd:e2(qxa r-, moving 88 m away in 13.1 s. It then turns abruptl-y:a 2q rx(ezdy 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 fr 64:yl cxn;ywdom $11 \; m/s$ to $23 \; m/s$ in 5.7 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 fronc3ltt/2 1fp wm $16 \; m/s$ to rest in a distance of 57 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o., owhhr jx+x0f $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentialldy + ;j fhoqsn0 9e:3u9vjwmv9y top speed about 9dqwj h:+y;vov9msnjf e39 0u $11.1 \; m/s$ in the first 10.8 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 unifo8 hqb)0hic*y srmly from a speed of $21 \; m/s$ to rest in 5.46 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid tl3ic5hqz/ndlu y)gs d/x+( 8marks 92 m long on the highway. Assuming a deceleration of ncldlhsx5 yg8+(/3dq z)it/ u$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tro(n wu/ge1n, z +fnbkgs ).9pbuck 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. Ah1)5rzcs- i khfter exactly 271-k hhzscr)5 i.0 min, 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?    $s$