Suppose that an object travels from one pocicpx4tbc- (9y d) d;aint in space to another. Make a comparison between the dis xcb)i(ac9cddt 4; p-yplacement and the distance traveled.

  When is the average velocity of an object equal to the insql6*ux;iwjfx j) b(70 gvl 91o*ecdkk tantaneous velocity?

  A new car manufacturer advertises that theirkhv-kz)4 s.rd car can go "from zero to sixty in 8 s". This is a description oks-rv)zd kh4.f

  An object moving in the +x axis experiences an acceleratiou )bb0,s 9cp8x mw3klon of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveli ;tikfs1;7oding to the East (+x direction) begins to slow down as it approaches a traffic li doik;1ti;fs7 ght. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directiswe:,fcbhq,e4o x *3vtj/h dd:q.p, hon) begins to slow down as it appr h*e.j, becfq,h dxodt43: vpqw/h,s :oaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make -- b7vs sob)6kjtn1 xe):nrh ia statement concerning its accele1en:h7)rt-i b n vsx )bko6s-jration.

  If the velocity of an object is zero, qnr9w5 jtdj 5os dl td3nj7;6;does it mean that the acceleration is zero? Support yo j;3d5 j7jts6qndworl d;95nt ur answer with an example.

  Can an object's velocity change directiv:vq oi7cq* l us1f,/aon when its acceleration is constant? Supv /a*s :l 7vioqfcuq1,port your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a s*u41zbzp0 : yqjgbv02 5uykomtatement concerning its motion wi2b*z:0uy0 gv 1z5muo4yp qb jkth respect to time.

  Can an object have increab oj)38r8ab tssing speed while its acceleration is decreasing? Support your j obr8s)8tb3a answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. d-x 2 we8 q/kk8:lq/tetm4n7mcg y +hyMake a sta8qnmqm-e4 g8kek:y/dch72l t/y wt x+ tement concerning its acceleration.

  Under what condition is averaggqbiw 1dx07*fe velocity equal to the average of the object's initial and final veiq7 *1 f0dwbgxlocity?

  Objects A and B both start at rest. Th xvpf 3k-.35lff dx,rhey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of objecvfkl rp,3x-f h5.f3d xt A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the sameoczwv9 7 a 3zs16q9ocween h(1*7 flbk rate. However, object A accelerates for twice the time as object B. vh31w kb*(97afn7we 1lc96zscze oqo What is the distance traveled by object A compared to that of object B?

  When an object is released from renw6 g+0kgk.xv* vwz1t6 , fcsest and falls in the absence of friction, which of the following is true concerning its motions*ntwc,1 0gf.zkvwv +66 k xeg?

  When an object is released fro vjl c1k10(pej7c4t2z; nefwlm rest and falls in the absence of friction, which of the following is j7c 1pcl42v;l fwkjne01 e(tztrue concerning its motion?

  Suppose a ball is thrown straight up. Make a statementfod/rx. babaw;5 l n k6b2cs14 about the velocity and the fcw l 21k6;x4nsba 5.abbdor/acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straorq o5,m-xf,dhp bve: w1;)cuight up. What is its acceleration just before it reaches its highest pmv,:5x )hufdo-rcbe1q,w p ; ooint?

  Suppose a ball is thrown 4 6jbl;eirr ,sstraight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocrbe4s r;ij l,6ity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum hedk8j6dtzk 3);z9hc9;on stzv ight, then falls to its initial height. Make a statement about the dir9stn9 k d)683hd;zvjzzkc;otection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make acha,y;q zxc,.2:**hqokd ela :x oyr/ statement concerningdr:*,yqexq */:c ,2klhaoyz; .x haoc its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Whatn12 ya;8xvkt80u; 1pxkf l;pp:e q frn is her acceleration when she she reaches terminal 1v2k f1a q;pl et 8:;u;8xnykxfppnr0velocity?

  A ball is thrown vertically upwa znb1mbhl/vsfi .d(;,rd with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the rd, 1;lh zfm.nisb bv(/atio 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 seconem9fd9aq b j.c d*tw.(i /+hj v/utn3od later, ball B is dropped from the same building. As time progres qc o( .e3wd b/9fji9./ta+t*mhjvdnuses, the distance between them

  Ball A is dropped from the top ojd bz(8u6n+mt m(:x dmf a building. One second later, ball B is dropped from the same building. As time progresses, the difference in:( mmz6dx+(8jm tub dn their speeds

  Two objects are thrown from the top of a tall building. One is throwg:h9w dfl n(j2n up, and the other is thrown down, both with the same initial speed. What are tdlnj fw:2g9 h(heir speeds when they hit the street?

  A brick is dropped from the to40cc b1ebf(qj -o3eenp of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of theoc n q(4ebec0-1 efj3b two bricks.

  An object is moving with constant non-zero velocity in the +x st m6nvu :5tm0axis. The position versus time graph of this object ism :06numtvts 5

  An object is moving with consty 9+ha:f(:hl i8ipbqdant non-zero acceleration in the +x axis. The positiolhdhq+ :b9f (:8aiyi pn versus time graph of this object is

  An object is moving nx*.cf dhfub7(*h)/ w zi9y)zba3q xxwith constant non-zero velocity in the +x axis. The velocityx9f /za3 uz7hyfhd*(c.i wx)b ) *xnqb versus time graph of this object is

  An object is moving with constant non-zero acceleration ing75;bzrv5d. oqkye 7z the +x axis. The velocity versus time graph of this objectz. zkyd;gor5 5v7e 7bq is

  The slope of a position versus 7yfag, g*pp8 jtime graph gives

  The slope of a veloci/mry wk i18gt2k0u 6vwty versus time graph gives

  The area under a curve in an acceleration versus time gra bnfa1h -z 2s9-0wwzurph gives

  The area under a curve in a velocity versus zu8 s/ayh;mq)time graph gives

  If the position versus time grazw wdq:t +6udn6; thw.ph of an object is a horizontal line, the object isq6u; zn dh:w+wwt.6 td

  If the position versus time graph of an object is a vertical liz)kq3p ::ir8n qv iiw kw00v3br4ra-nne, the object is:4nq3p8rz r3n wi iw-0)aqi 0vkv:bkr

  If the velocity versus tkz azgqc x0q(**0iqjxzw c y17+h4z7dime graph of an object is a horizontal line, the object z 77xyh*c0c*d4z j +q k1wqzxzga(i0qis

  If the velocity versus time graph of an object is a straight gx7dp 6xbv-p( line making an angle of 30 degrees with the time axis, the ogbdvppx -x7( 6bject is

  An object moves 15.0 m north and then 11.0 m south. Find both the distancec-7vss+a7ntful z )w- traveled and the magnitude of the displacemen vl7 7tu-+ws)ncz-as ft vector.

  A boat can move at 30 km/h inv-crsm:2m;n2b l v n wl:3h2bs still water. How long will it take to move 12 km s2h lblrvbw2 v3 :cm;mns:-2nupstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? 29. gt2nyr i,pw dr(huafr k+;(1 mi = 1609 m)

  What must be your average speed in order vqw6jq:j-,; w n)lz+wjiym2fto travel 350 km in 5.15 h?

  A runner ran the marx 3 pdkahio0 u 1(zu2lg2yfz/4athon (approximately 42.0 km) in 2 hours and 57 min. What is the average sp 42 zdgpyh0/xa k1fuui l3o(z2eed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to trav/ :msyz4qm t3d*tl0 nqik;n8q el 400 km?

  A ly (light year) is the distanwc 9+ rsj(1vmoce that light travels in one year. The speed of light sc91+j(vwm oris $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 7eur s-a1y6i ) b+ou/qc2 km/h along a straight road and you look to the side for 4.0 s, how far do you trau+-ous )a1r q6e bi/ycvel during this inattentive period?

  If you run a complete m;qae;kgz u7;loop around an outdoor track (400 m), in 100 s, your average velo;ka;zmeg 7qu ;city is

  A polar bear starts at the North Pole. It travels 1.0 km south, the8 ft/tk8e hdm.n 1.0 km east, then f td.e h8/mtk81.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km elekb -pl,7 mqgy)ao ;1.-rs oaast, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the b yaq.p;m) aok7br l,els1o- -gear's average velocity?

  You are driving home on a weekend from sch(rmem 30aztr*or 3 l)wool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive( a3 rer*3t mzmw0lro) 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 khcs)ajd2 k2);ttj yc rhd4r00m at 100 km/h. What is the average speed of theskjt)4rcdjd2 c)r;ht h20a0y motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h an r5 zlv oxds56qqh:i3/d 2.0 h at 100 km/h. What is her average speed forrdoiq 5svh/l6 3x5z: q the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 254 df9pzr upe2-0 mi/h north for 750 miles. What is the average speed 9r-4def 2pu zpfor the trip?

  In a 400-m relay race the adsg2 8+6 fhewai ej7,znchorman (the person who runs the last 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 runner can have when the team A runner starts the final leg of the race, in order that the team A ru 7dzwj+i8 fheg,a2 e6snner not lose the race?

  A car decelerates uniformly and i9f(,w:+r;cmpoe bc z,g brw0 comes to a stop after 12 s. The car's average velocity during deceleratioe o,,g z(fwrpw0cc; mbrb:9+in was 36 km/h. What was the car's deceleration while slowing down?

  An airplane increasestk127tmv-hw gprt +( u its speed from 100 m/s to 160 m/s, at the average rate of +pt(17 g wh ur2vkmtt-$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of u:w, dlqvn6f,$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerat/okn h4fkuki)u402ep hx1ph6 w 92mvzes 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 withs,9gne ,cm-uj a constant acceleration of ncg, -eu ms,j9$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.8 m/s experiences a constant acceleration ,y.3vzz9lqgw2 t .x73 grgopeogt rxzgq9l32ev. z3og,.w 7p yf $4.0 \; m/s^2$. What is the cart's displacement during the first 6.4 s of its motion?

  A bullet moving horizontally to the right (+x d(t+ ouyxaifz3s5 :r4q0 ub v9hirection) with a speed of 244 m/s strikes a sandbag and penetrates a distance of 12.10 cm. What is the average accelerati+x 4(uozsrubhi935q: ya tvf0on, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on f7bb) : e95/q5o9 ewrd/bjf pprb5 kwvan aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accfqpfrj75wkr : / )e e5v5bodwb p9bb9/eleration is constant, what is the length of the catapult?

  A car starting from rest moves with constantxb68vspeo n 3* 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/st9zb899ka a xp to 80 m/s in a distance of 200 m. What is its average accelerxa999ba 8tpz kation?

  An object starts from rest and undergoes u fc : )3tyuhq7/0fxotiniform acceleration. During the first second it travehix03o:y t)uf /c7ftqls 1.6 m. How far will it travel during the third second?

  An object is moving in a straight line with constvx4j1c sh m9d2ant acceleration. Initially it is traveling at 16 m/s. Three semj xdhv194c 2sconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unj8ac;)ld +ubm i/7 6mvh1ga sriformly 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 6uykl+ggc 0.e dry road 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, a car that has beenuaki1,jsse55 waiting at the intersection starts ahead with a constant acceleratiosksije51 a5 ,un 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 upwardk fo i6q;us;a:asyt/7jcxa h3/::hat with a speed of 12 m/s on the surface of planet X where the acceleration du oi:k/cjxs t7 3a;ta;6aas h:f y:/uqhe 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 the surface of planet X wheyo: ofkf,;5p)o va ,opre the acceleration due to gravi op)af,ov5f ky :;o,poty 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 of planet X vmc6blos +hd6;/(souwhere the accem 66s(h ;sou/+c oblvdleration 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 thefp1zfeyo7 ) k-rjn0s1 surface of planet X where the acceleration due to gravit )01per7 fyn1-o zkjsfy 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 frie5s ()-bqeot 9fcwh7jl 8u,vkvk;e a8cnd holds a ruler between your fingers and releases it without warning, how far can you expect the ruler q c)e5; 9abweouh-v(c,8ltskvf 8kj7to fall before you catch it?

  A ball is thrown upward al 97muo mnv9j pqzdd+9ja+ ;:mt a velocity of 19.6 m/s. What is its velocity after 3. vp+mzn79d+u:odl ; jmjq9 9ma00 s?

  A bullet shot straight up returns to its starqyamno: 76 4zrting point in 4 s. What is the initialm4 yznr o:a67q speed of the bullet?

  A ball is thrown stragz -8eq4(drfbight up with a speed of 36.0 m/s. How long does it take to return to its starti-8rqd (bf4e zgng point?

  A ball is thrown downward from th .dcdvbv2es5/ e top of a building with an initial speed of 7 m/s. It strikes the ground after 6.svcdb d 2/.5ve9 s. How high is the building?

  A ball is thrown stra+ s-3da-qoqrp1q /n rgight up with a speed of 30 m/s. (only fill in numerical value inrq/agn-31-qs ro dpq+ 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 into the air with a speed of s.x;zavjazba1 f a :72:.dgcp73seco43.0 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 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 = 1.0 0 oow bx-g dv2mjgo6sx0(vk) 4m2wh7zs?

  In Fig. below, what is the velo1cl e8oog1hif/ux w+ /js mk02city at t = 2.5 s?

  In Fig. below, what is the velocity at t =.crr f 1pau*utcep pt)8p2;x; 4.0 s?

  In Fig. below, what is the :uj7sctp-nx bb 2bg57velocity at t = 5.5 s?

  In Fig. below, what is the average 8w)4qsv 2eam*)mweh-b47tasj q(k v vvelocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0axxk506j t,h jaz0z0u, bzv/d to 6.0 s?

  In Fig. below, what is the aczvvwp;*hy vk8y3d3z 6 celeration at 1.0 s?

  In Fig. below, what is the zle ub)ofuin3y/*0o .acceleration at 3.0 s?

  In Fig. below, what is the average acceleration fu a )fcey+7b0/wr t:yfrom 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0yd-4xpu*fth0 to 8.0 s?

  In Fig. below, what is thel hdc8mn em /e. j5ol-bg(* ja,7c.xu 9z4ggyu displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speedw;c xh6zth**9 qm:xjd|velocity}

  An object can have a varying speed if its velocity is constantk5 3cbnmfs 1dh*e:nc6 f7ua etq793cm.

  The velocity of an object can be negative when its acceleration ;34w pgbv-*a hmmk in2is positive.

  If one object has a greater speed than a secon9f bg 3ymhkzl4h6;o g8d object, the first must have a great86;f ky4b z9o 3mlghgher acceleration.

  Two cars emerge side by side from a ex8/r2 8;uts (kjqdvc 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 accele ,a.kaga 77 oehy*eyu,ybnw- 5ration decreases.

  A baseball player hits a foul ball straigi(d2t ztr3 ru4n brr+3ht up into the air. It leaves the bat with a s t3r2trrr 4(+bn3zdiu peed 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 acceleration, *sk1*s b- bw/ ls1tkrnhow does it change if air friction is igno n1 kbsbss-*lrw/1kt*red?

  As a freely falling object speeds up, what is happening to its acceleration 477afhehmnx4h - t vok5x7l/k, how does it 747/hv htofkl4 7m5nexkh-a xchange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original p wmuozw t(45o3osition with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this resulou 35om(4ztw wt be altered?

  An object can have zero velocity and nonzero acceleration at the samgsjs qys,6xfc6 8wq6ih. t3b6 e time.

  An object can have nonzero velocity and zero acceleration at the same ti oqyb7m/ehsohv863 8s me.

  An elevator moving from the second floor to the fifth floor canw ra 2ax;i*yq 6q16making no stops along the way has zero acceleration all the *c1y26a;iwqxn r6aq atime.

  A rolling ball moves ,di4n rs/nm2dpnr1:x j2z h5 sfrom $x_1=3.3 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ 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 $t_1=-3.1 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps arb,(y5a;n+aceft*r d.y bwpn+ rdx 7,vound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away r pz2/fj//c offrom its trainer in a straight line, moving 114 m away in 8.5 s. It then turns abruptly and gallops halfway back in r//2zo/ pj ffc4.5 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 o2huyuygv* q, +r)jthcnb,1(om $11 \; m/s$ to $24 \; m/s$ in 4.6 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 frokj l//r-b.pu a-9/+8ujt nfuey+vdw m m $16 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spe vzo+g(*,ig-lawrp2xuv+ 4 (zdk rk4xed of $28 \; m/s$ 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 burst out of t ucx0nayew,2ltn. .q(ryo.k d9m4d(hhe blocks to essentially top speed aboutkl0ndme xyhdr.(owc t.(uqy492, a n. $11.4 \; m/s$ 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 a speed ofjz -ce8s0,u( :4kazl nty6jho $16 \; m/s$ to rest in 5.65 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car rjj9l.d3k1 koleaves skid marks 92 m long on the highway. Assuming a deceleratilj1 3ok k9d.rjon of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin6,xyaz wm. ,5/viebbr g $25 \; m/s$ 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 lesshlgccw*di1evt84i v1 (m10me than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must thdc4mm ewi0 e8i v* 1l(1tgc1vhen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$