Suppose that an object travels from one point in space to another. Make a li)v1r v rqrarj( ,w25 mjb)o3comparison3wvaq 5( )ljmrvi2 , jb1rro)r between the displacement and the distance traveled.

  When is the average velocity of at, n/e5xfds7l n object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to six zd.3h p.lyjm7ty in 8 s". This is a descriptionpz y3d.m.7 hlj of

  An object moving in the +x axis lyqetc0u,)g 3 experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directio ope5l 50y6ahcn) begins to slow down as it approaches a traffic light. Make a statemen0a5l heo5 cy6pt concerning its acceleration.

  Suppose that a car traveling to the 2v hn-o*b veemi.()d ,otgy9bWest (-x direction) begins to slow down as it approaches a tr goy-* ,9tvm2e odb.b n()heivaffic light. Make a statement concerning its acceleration.

  Suppose that an object is movineozrb;eb m 3:py7szgxy-f851 g with a constant velocity. Make a statement concerning its acceleration. p;7 81oxeys5g-ye brmzb3zf:

  If the velocity of an object is zero, does it mean that the acceleratii *p co n2*btn3k)1yzjon is zero? yp)jo n*z bni *tck213Support your answer with an example.

  Can an object's velocity change direction when its acceleratio t8yaijz7:v(zn is constant? Support youtziyv7 :j( 8zar answer with an example.

  Suppose that an object is moving with cons: gmwr8yq7b n-tant acceleration. Make a statement concerniw-bg : qyn7r8mng its motion with respect to time.

  Can an object have increasing speed while its ar /c 5y pwg3cdt+r2f-m6nb, rt7asw/v cceleration is decreasing? Support yourbmnt/y w3vgwptcr2f/s 7,6+ -ad5 r cr answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. i9 dt bwd29fd)Make a statement concerning its acceleratiwd9 )bd2dtif9on.

  Under what condition is average velocity equal to the average of the o/o d 7pr,cdiz io/94ghbject's initial and final veloc ,p 9rocd74/o/dzgi hiity?

  Objects A and B both start 5acwg- ugrtw1(s0)1r6h cp nfat 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 object A compared to that of obj(ugt-5hccpsg0n rr ww6)f11aect B?

  Objects A and B both start from rest. They bo .zu1 w,+ldopdth accelerate at the same rate. Howed o.wz+p dul1,ver, object 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 rest and falls in thg d2y8/qfot/o e absence of friction, which of the followto8do/gf2y /q ing is true concerning its motion?

  When an object is released from rest and falls in the absence of friction,8230/h*gs3nr 0siw nbhvy vr r which of the following is true concerning its motion? h v8shi0w 0rr3 rg23*nsyb/nv

  Suppose a ball is thrown straight up. Make a statement about the45pqw6d x d;eo velocity and the accelerd6o ;5eqxd4 pwation when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is d+t-ch9iit+l its acceleration just before it reaches its highest poithi tl- dc++i9nt?

  Suppose a ball is thrown strai o 0:dvhe5,udeght up, reaches a maximum height, then falls to its initial heightv euh5e0o :d,d. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up,ms3oj):e wlc9 4g uw)q2yi- rf reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity anr l3ogcw4mu) jw2y)q - fsie:9d acceleration as the ball is coming down.

  Suppose a ball is thrown downward -jz9 ypu-zwybf59 wib 75wqj2in the absence of air resistance. Make a statement concerning its accelerauw-b p 5j2by99q5z f7ww -yjzition.

  Suppose a skydiver jumps f4fxtwzzfu6kv5 ob6i67xmk62rom a high-flying plane. What is her acceleration when she she reazfwx76 x 5ibtk 6fz6ukm6v24oches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identxifl j2m9u4d21al0ws r*w wr *ical 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 lj x1 w0*ld2*irw9srum2 a4 fwthan the first ball?)

  Ball A is dropped fromd-n eorrycw 0kra g4kp r6;2*( the top of a building. One second later, ball B is dropped from the same building. As timekr0cw2 nr6rg4;era* py(-odk progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball Bfh(;q++ oe epe5a::nu*eoz, paq,aq f is dropped from the same building. As time pe, q:on*aze+qa,fe pf u5q( a:+e poh;rogresses, the difference in their speeds

  Two objects are thrown from th55to3delx u11bzwc i3e top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are ttl zb1wec5o3 u5x13di heir speeds when they hit the street?

  A brick is dropped from the top of a building. A second bw5hq5f t-yor 8rick is thrown straight down from the same building. They are released at t- wqrty855ho fhe same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Thegzre4 odl;k spkf/+,6 position versus time graph of this o4+p6fz/ed,sr; kol kgbject is

  An object is moving with nf 1j(d;n*fhsai; (l39 rfsqaconstant non-zero acceleration in the +x axis. The positi*flf (d; sa;n(sh9arfnq13ij on versus time graph of this object is

  An object is moving with constant non54 egf u/6r8xdcaeya 2-zero velocity in the +x axis. The velocitydy 4u2eacxf5e/ 6ag8 r versus time graph of this object is

  An object is moving with constant non-zgug- wouf17 +pero acceleration in the +x axis. The velogou f17-+pgwucity versus time graph of this object is

  The slope of a positiocz6w.4zdb ;mp n versus time graph gives

  The slope of a velocity versus time graph give0tk ejmnng50 6s

  The area under a curve in an acceleration versus time graphr1xyd ege 72u2 gives

  The area under a curve in a velocity versus time graph gi 9nd6w4z7 ecxf9be /vnves

  If the position versus time graph of an object ic w2dn9/gr7cal ol6 z)s a horizontal line, the object i 6nc odar/c)l2wl97gz s

  If the position versus time graph of an object is a )m 1;lp1dh 3sr fk+(jcx )ldpuvertical line, the object is ms(j1x)plkdpc 3f;lu) drh1+

  If the velocity versus 9kd2y 5l .9frtxty9x:g.i7cw.bck rt time graph of an object is a horizontal line, the object tc.f.tr9ty c:5l.irxb9 k kyw7 2g9xdis

  If the velocity versus time graph of an object is a straight line making an angyn+acl8 d n6kyuq/8j 0le /y n6dlnuyajk+8q0 c8of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both 7z odvx f i7.x*aa lrdj0.9i.sthe distance traveled ano0asaxixf l.dr.i.v7 z79j d*d the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 mlld kkt ja j50/q9y(sjk30*tkm upstream in a river flowingj/lsjk( y5a0 kkmq0t 9lj t*3d 6.0 km/h?

  55 mi/h is how many m/s? (1 m.i y b-qz9n;abi = 1609 m)

  What must be your average spee bwhs2j rj /+g) vo*6:acqjop6d in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours an)gxbsovna,q4r0h q0 sw+ tw+ )d 57 min. What is the average 0,)xs whrvt4 + )aqgow +0snqbspeed of the runner in m/s?

  A car travels 90 km/h. Hh(.4x txp zjhpo-)ju(wp o 98wow long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in 5s-/bx;6*en+-nvrnw u3)k- p ejnci,kgauen one year. The speed of light iu nenj-w iku5 nnep3-/- ),6cnv +aebrsg; *xks $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h alongdoii 00z8u ria y.lzn(h2at0 + a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive perioi8 + 0ni.i(20za0udhatyzor ld?

  If you run a complete loop arow58fa. 4ftm3icin.s wund an outdoor track (400 m), in 100 s, your average velociamfc 58sn. wi.wif4t 3ty is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0a ..urn4utej/vv(e8y km east, then 1.0 km north, then 1.0 km west to return to its starting point. This .(v a/u ujeer.tyn48v trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pol hn34+4w.dfuvd u5,d; ijvvtbe. It travels 1.0 km south, then 1.0 km east, then 1.0 km norvhu3u+biv n4,td 5f wv4djd;.th, 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 miles. x,ntec8 :6m,:adfofwIt then starts to sn, a:x6:8w den mfcfot,ow 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/*o/.3s 8ljv eclom8mbh and 160 km at 100 km/h. What is the average sp3msbvoemljl* .8 /o c8eed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 10lm2jr ht0i .q7uxrr +40 km/h. What is her average speed for thu 2lr0ihxj+rr7q4m.te trip?

  An airplane travels atnsbh: hjx .ot7ii:) 6i 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average xij7h:bt ) 6ii nso:.hspeed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 10t52c- py:fmig0 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 tc- 5iy:2fpmg 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 un p f(t 75l/t27owjs4ta mqd7ky9 *bgb rp8rfa-iformly and comes to a stop after 9 s. The car's average velocity during decel7y/5t7r t2bj8 flsdwptrop 4b9kmg*qa f7 -a(eration was 51 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/m,mdqi8,uy e 6s, at the average rate of ,y8ei mq 6,udm$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelpvka5vfhl 4 9tna )1w*erates 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 rai jqk0m,48ot8;9b.r ub2qeduq by 1rest 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 up with a constant accele eb2j 6.ofv.bkration ofvebj.2b.of 6k $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.9 mx ru*w: el*xz(/s experiences a constant acceleration oflx(:zeuxrw* * $4.9 \; m/s^2$. What is the cart's displacement during the first 9.4 s of its motion?

  A bullet moving horizontally x9 qw; gfvg,r1to the right (+x direction) with a speed of 395 m/s strikes a sandbag and penetrates a distance of 9 frgq9 gv1;wx,1.05 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from by-wpv3.s; bo/5lo le 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. Assuming the acceleration is conspos3w-e l .;o/yvbbl5tant, what is the length of the catapult?

  A car starting from res kza y (bsk:3hmz,s47st moves 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 2 kdj;x fwp;mv u)gr+hbgkji:e *9rif:8t7v* to 80 m/s in a distance of 200 m. What is its average acgvj +t:8rfbepxk;**) 7r;jvmw2uf d9gkii h:celeration?

  An object starts from rest and undergoes uniform acceleratgsgds :qb0 6 4h)rt (8tr(ddncion. During the first second it travels 1.9 m. How far will it travel during the gh(stcd: rn6 t0s dqd48)gb(rthird second?

  An object is moving in a straight line with constant acceleration. Initi-wxau* zy(+ v.np3 r)ozel-:jcoq0xp8 ye9lbally it is traveling at 16 m/s. Three secon9+*e8xep-vn a : r. l0q-zp()zo cy3bjuoyxwlds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly7(x wy-z32cff)j;,j tgpakd co nd;a- 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 de.9l+bc y+ burncelerate 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, a car that has beegbd9ph//l- u .yogi ,vn waiting at the intersection starts ahead with a constant acceleration ofo/uh ybg9-/i vl.dg p, $2.00 \; m/s^2$. 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 fg8 8 hjrzgy;8speed of 12 m/s on the surface of planet X where the acceleration due to gravitgf8r g8;yzjh8 y 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 the surface0e )svwws q+t(1rwd/ e of planet X where the acceleratiovq1sw )wedrs+e(0wt/ n 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 sp( ;:(mjla8fa (utef rheed of 15 m/s on the surface of planet X where the accelf (maaj8uf(r(h:;l eteration 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 1sc0caq3r21( sqhpu) x 4 m/s on the surface of planet X where the acceleration du ps u xq1sa0h2c3qcr()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 gre7ah3caa j-ukf(g6gmej . 5x (xater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the rule3 a-.jg6kxajaxem(f 7ghc (5ur to fall before you catch it?

  A ball is thrown upwarl p(s4jk-ca u,d at a velocity of 19.6 m/s. What is its velocity after 3.00cj( 4 pku-,sla s?

  A bullet shot straight up returns to its s(;xwjn x *lks8tarting point in 17 s. What is the in*jxwxl (8kns;itial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How lonwvl cg-+ qc9-9jwp1 +un8vm(l vhcbq+g does it take to return to its startiv1w +hc+cjgplv9 qcv-b+w (8u-l9qnmng point?

  A ball is thrown downward from the top of a building with an initial z4ku(d4 *wa mtspeed of 5 makw4z *d u4mt(/s. It strikes the ground after 7.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nu1u8p1d9yyig imerical value in the blang81uyi9 d1y ipks)
(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 rlfsy ; x,mq)1i+cjo2 air with a speed of 49.8 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t /xzm(t6 r)rcrtnb0 l9= 1.0 s?

  In Fig. below, what is the velocity a+an+fo8m ;f4b:j evcqt t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.86s mhxk7ha3p w xhan2owsgg)69(1pp6( dvev0 s?

  In Fig. below, what is the velocity at t = 5)t raqwauow a uq/y*t,p (;v6:.5 s?

  In Fig. below, what is the average k./ y2dpqns hjfizkf,/t4 ay)ri8/ +ivelocity from 0 to 4.0 s?

  In Fig. below, what is the average velocitnm/awb ;84 pogy from 0 to 6.0 s?

  In Fig. below, what is the acceleratzc ktg)1 4-uclion at 1.0 s?

  In Fig. below, what is tqxcy5 :1nnsoiyg o117he acceleration at 3.0 s?

  In Fig. below, what is the avbo68a +k p0lg5z9bs jmerage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tpx)sw h0 gvyz-*mu).o0j9nd hyq,1rl o 8.0 s?

  In Fig. below, what is the displacement from 0 to +z2*,cn y-h7nmuspt p8.0 s?

Does a car speedometer measure speed, ve3eby:+ ydd*o)6bghbw0djud, locity? {speed|velocity}

  An object can have a varying speed if its velocitwl4:blezg suhk+z,a)/yc0b)u 9 ;neyy is constant.

  The velocity of an object can be negative whc i jfv3o;h rm a)2k6;co3jrk;en its acceleration is positive.

  If one object has a greater speed than a second objdh iyo l7svf5ee5djeuf;j4 , r cy g:;-*mge+)ect, the first must have a gry+r;:l; ygo em,-ief 7vhegudd5 )jjs*f ce45 eater acceleration.

  Two cars emerge side by sim 2zo10yw 9vh+ :bnfg,l7 ijqsde 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 speed as its acceleration decrease+vqx ,s4qshd/* 5eod vs.

  A baseball player hithdc,wuu9 ro-w8+s o t)s a foul ball straight up into the air. It leaves the bat with a t-cd)9wh oorus+w,8u 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 object speeds up, what is ( y *be*f5regeha8p (e+)iwcchappening to its acceleration, how does it cc(r5( fe*i)aw 8*eeghepb +ychange if air friction is ignored?

  As a freely falling object speeds up, what is happening to its:e 1-tg wsw/am acceleration, how does it change if air friction CAN NOT be ige-a mgwt:/1ws nored?

  An object that is thrown vertically upward will return to its origina hxq8su2.3zimccg )uw jm156al position with the same speed as it had initially if air resistance is negligible. If air resistancjc q13)izs u8w2g.5 mamhc6x ue is appreciable, how will this result be altered?

  An object can have zero4zlennq 2kc t7 n03sc6 velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero accelerationiv(3: ( , ay,oqv w;cmlugbc+x at the same time.

  An elevator moving from the seyqem- ile0-)z cond floor to the fifth floor making no stops along the way has zero acceleration allq-l0my ei-z)e the time.

  A rolling ball moves from3a0 l76 ftjl msz-h1xu0eyo/w $x_1=1.7 \mathrm{~cm}$ to $x_2=-4.3 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around 3y0x)ous4d qrdv+s 6ca quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.7 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 lia6um(h m yz/(uy)fr3jne, moving 102 m away in 8.5 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculater6ya mfuyh /uj)m((3z (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 from g2 1cwt m+vc;,gb aza3$13 \; m/s$ to $25 \; m/s$ in 5.6 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 from6uj6 ez nk)gu, $22 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach acdze*ti+s*zx;- by 8x speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burcu(n68q95c /qsu, h ohpcinc iuc 6u(u9,o;msst out of the blocks to essentially top speed aboutc oio(cq8(, smu 659nph huqcc u u6unic/s,9; $11.0 \; m/s$ in the first 12.1 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 uniforx5)( cagc 9vyslcx9)rmly from a speed of $17 \; m/s$ to rest in 5.92 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves )s(r3dzrx ,op1 7hh t*xc 3bfzskid marks 92 m long on the highway. Assuming a decelehtxsz71drzf*3,p h cx o3b ()rration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truciw98 :howwk :ak 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.-gsupmjn ;m: wm5w uu4vbx- *(0 min. After exactly 27.0 min, there are stilsm ;:b 4uw (w*ux-vjmgu -np5ml 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?    $s$