Suppose that an object travu ing/2l mjg16els from one point in space to another. Make a comparison between the displacement and the d iug6mjn2lg/ 1istance traveled.

  When is the average velocity of an object equal to the instantaneousputh 8rk9* 54 :gsnlps velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty ut/6 njc8ud *fin 8 s". This is a descripti 6 ut/8jdcn*ufon of

  An object moving in th,qjz6n 3uzg8ao qc q td/a/;b+e +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the51l /v/jk+aav 3xm a;i pbxb8v East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelerat vjap ak/l;8/b+xm3ba5xvi1vion.

  Suppose that a car traveling toxdl)i )m 4m.d 7qun;se the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratix)ime4mdn s.ud)q ;l7on.

  Suppose that an object is moving with a constant velocity. Make a statement wcxc. ;be2hp4concerning its ;42 c.xhwbe cpacceleration.

  If the velocity of an object is zerorq) kk84r 9wavv boo5 +p.qy.j, does it mean that the acceleration is zero? Suppa5.9r)k+vbr4pvkj q yq8o.ow ort your answer with an example.

  Can an object's velocity change direcw729s nyi eyl3btcx-8- tyua)tion when its acceleration is constant? Support your answer 9-alnx t b 8yyci)ty2sw73u-ewith an example.

  Suppose that an object is movis(r yeb /k+vqqus+t8 7ng with constant acceleration. Make a statement concerning its( 8+vqstsrb+ e q/uky7 motion with respect to time.

  Can an object have increasing speed while its accelerationh nktccn59ro c/9x)9c is decreasing? Support your an ckc/cro9t99)xc5 hn nswer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hillqurx yozv,+ ;+.ge cef((aw ,l of ice. Make a statement concerning ita+l,e( o +y .quc;(,vgr ewfxzs acceleration.

  Under what condition is average velocity equa6hzq nvq p0+j,l to the average of the object's initial and finaz0vqp q, 6nh+jl velocity?

  Objects A and B both start at rest. They both accelerate at the9m gve40jq. vpm, ktmd88ho3v same rate. However, object A accelerates for twice the time as object B. What is the final speed of m9jt8. 4khpgv,vd e80mov m3q object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate wa 45wpqu,9a4w 5yg hycrda)2. However, object A acceleratesauaca2ww 4q 9 y4)hw rdg,p55y 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 fzb 0ut-5y kzzfnw4q02 (tq)e f(h+ejiriction, which of the f20(f ikzz tyb(05uej wtzn) qeq+h-f4ollowing is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, wh4vlfvn 0j 1gy6ich ofv6 lg1ynfvj04 the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a stater jxcgvjw+0u j+b 8fimok/;(- ment about the velocity and the acceleration when the ball reachej8oik r+v -j0;g+xufjcm( w/ bs the highest point.

  Suppose a ball is thrown straight up. What is its acc:c-iw;c lxue3eleration just before it reaches its highesx;wuce3- i:cl t point?

  Suppose a ball is thrown straight up, reaches a maximum height,r-w ,,o +am6mk-gqohr then falls to its initi-rm oagh+,k-wmr6qo,al height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximumg;nm8 rj)8g 1*qwyybg height, then falls to its initial height. Make a statement about the dibg y*wym18g );ng 8rjqrection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thro +xd,hhr) tnq/wn downward in the absence of air resistance. Make a statemenx +d h/tqn,h)rt concerning its acceleration.

  Suppose a skydiver jumps from agwcn(9xl tb1*q qe a 4e.6obp- high-flying plane. What is her acceleration when sw(lq4naq1cb. b* -9g6otxpe ehe she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball is dhu kyt p8()o++u9hxf thrown upward u) xpok(hh +9yu+t8dfwith 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?)

  Ball A is dropped fr0zbv5uc:7 kcd9uyb2 u om the top of a building. One second later, ball B is droppe0u :9bcy2bkz cudv u75d from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a buim*n6d : fqbty2x*/w ohlding. One second later, ball B is dropped :m2db6yt*won qx f/*h from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Onecsi o0byir 8)p3q uq/1 is thrown up, and the other is thrown down, both with the same initial o10u8i qrb)spq/ 3cyispeed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is tvwur5(6u: eoj hrown straight down from the same building. They are released at the sw ejv6:r(ou5 uame time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with consm-ia*b 8 aw0rdtant non-zero velocity in the +x axis. The position versus tiab-rw0m d a*8ime graph of this object is

  An object is moving ede 4ix/q)3mbe/dgs4with constant non-zero acceleration in the +x axis. The position versus time graph//dx dqsb)4ee34 igem of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocitk.h59h:dpq uky versus time qhuk:. 5dp9khgraph of this object is

  An object is moving with constant non-zerop : kig. xk3kbom-o,o8 acceleration in the +x axis. The velocity versus tim ikk,3bomop8k-x. :goe graph of this object is

  The slope of a position versus time graph gik5 rmo*y xc/do b.;-dgo;z p3mves

  The slope of a velocitl/qrb94 xt:sj2-aof oy versus time graph gives

  The area under a curve in an acceleration versus time graplq l+g9n 7tfwrk8+u/m h cf(8gh gives

  The area under a curve in a velzryp( .bv i03eocity versus time graph gives

  If the position vers m2y6gn 8xm5vzus time graph of an object is a horizontal line, the object is2 6gnvym m58xz

  If the position versus time graph of an object is a vertical line, the2 fsev))h1 qz6 kw:kg+l2l keg object is+kg l6q e kez2)k2)v:fsh g1lw

  If the velocity versus time graph x1+h1 vhn nyj4of an object is a horizontal line, the object i+4 1j1hynv hxns

  If the velocity versus time graph of an object is a7- :cwlab )a/ly) s hjohgf7*y straight line making an angle/wj o a7*yfs) ):hl7ahg-bc ly of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south/e+ko /mv3 k j+ u+ey9s+ky5 okikebk2. Find both the distance traveled aki+yk2eek9so yv3mkb/ k ku5 o/ +++jend the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How l;zyc4 pcx)n)2*gke tjong will it take to move 12 km upstream in a river flowing )t)z*gkp ey c;xnc24j 6.0 km/h?

  55 mi/h is how many m/- jcntge-j- +gs? (1 mi = 1609 m)

  What must be your average speed in order to tra/yyyw3 w ftpd 2epo;)ed*y 5 b8ncj.,hvel 350 km in 5.15 h?

  A runner ran the marathon (appr3 g )k6/giu0vjw0fcpy oximately 42.0 km) in 2 hours and 57 min. What i03cfk vgwp/)0g6 iyujs the average speed of the runner in m/s?

  A car travels 90 km/h. How lv w nft5)3bked rc;0j6znur/5ong does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. 0f 3 x jsktzh+tf.7vu9w7(lx 7-wt gnkThe speed of light iu77vs (9jx-f.thwk 7t ftw+n gzkxl30s $3.00 \times 10^8 \; m/s$. 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 road and you look to the sidxbktzu,q.orbq44b*- xs+d + re for 4.trbsxq,.+bqr4+ dxu z4b *k-o0 s, how far do you travel during this inattentive period?

  If you run a complete loop around an o9 hunm yhc+g8k-q0 we; x*rky+utdoor track (400 m), in 100 s, your averageq+gmux yk8; e-chw09 h k+ynr* velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km e xmau ,q.rsoh4 b8d.(tast, 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 aver,tux4ds.ao b(r. 8qhmage speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, the+lbp w46n11sg mu 3xbin 1.0 km east, then x14wbsi1g n3 pu6bml +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 scpwq;qq xrk8w(1sq ,*rhool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is yor;kw qx8qq *1 rsqw(,pur hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is1-dmw-ns5bcwd+ q s c+ the average speed of the motorist +1w-cbs dn+ s dmwcq-5for this trip?

  A motorist travels for 3.0 h at 80 km/h 2t.5 -a vikajn t8rkmt/,6ikqand 2.0 h at 100 km/h. What is her averageq5-ra/ mijtik 8t ,k. ntv6ka2 speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/bte is1(gv3-wqij-7 bh north for 750 miles. What is the average speed for the tr b-t-qsb( 17v i3iwgejip?

  In a 400-m relay race the .h,04 td h3homrdo/l qanchorman (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 that3t/r 0dm hdolq4.hh ,o the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 13 *nc5y nk:p/hg s. The car's average velocity duringg 5c/nh*kpny: deceleration was 65 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, ati .3g0*knnb yz the average rate of ig* nk3.y0zb n$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates mn) e9(f+b uxu7zrqr*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 rest 9fn0p8 .xpi,skkjub: 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 wiz- zt2lzon-u 7th a constant acceleration of-zlzto n- 7uz2 $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.y6slu) )j/yiz gedi 673 m/s experiences a constant acceleration o6/yu)jzsgi)y6i e ld7f $1.4 \; m/s^2$. What is the cart's displacement during the first 7.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 401z;fc/r)jm wo9 m/s strikes a sandbag and penetrates a dismofz;9 r/c )jwtance of 87.60 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched froy)- cnz8)j*m,-g7- bqtfgfwaafdn p 4 m a catapult on an aircraft carrier. It reaches a speed of 42 m/* )t)n fq8w- gj-pb-7gazc fa,dn m4fys at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accel9/+bixfkew 2-6yf l3vtdw nc7 eration 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. qkxeeq 8f6wc 5s6+)caWhat is its average acceleratq)e6fq swac8 e+c xk56ion?

  An object starts from rest and unszf09p47ypt k dergoes uniform acceleration. During the first second it travels 4.9 m. How far wfk0 z7pt4ys9p ill it travel during the third second?

  An object is moving in a straight line with c:+wo jk:jzyc (onstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How:oy:cz(j +wk j far does it move during this time?

  A car starts from rest and ac;o 6dyo q.,px7 p0bjaxcelerates 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 decelerate at abouyfsst:o)xz2 e98 m nh.t $5.0 \; m/s^2$ 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 been waiting at -a*l(n)x msg:x ojlnkp83* i qthe intersection starts ahead wi*)mkn* ap( s:ixo3nqljx8 g- lth 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 planeb78r kj g((fo8is:vq w4fn1uyt X where t7 okju:iv(1g ffy8(n4sb q8wrhe acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward withjnp4k8 1wlgzpjapq) 29ag+j9 a speed of 12 m/s on the surface of planet X where the acceleration d p qn2lg+aa49z)kp9 gw j8p1jjue 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 upwag ssdslm3 ,wb jxb:d*.o,n+/wrd with a speed of 15 m/s on the surface of planet X where the acce*w.3,dmob/ xswn,: +lbdg j ssleration 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 v0nj j5;jqrr4 rqu,o2 q8e(qmm/s on the surface of planet X where the acceleration due to gravi(quqoeqr4 8r ; jq ,r5vmjj20nty is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10e28 ncxc-8eqiecwt+ 32l-zp p s. If your friend holds a ruler between your fingersc w8e3tipz qcne2-lcx2e + 8p- 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(5: xzrpn27ckwppuvkf:1e+e 0 k.ros velocity after 3.00 s2 z5k70sofwx:vr .r+pk p ecu1:nepk(?

  A bullet shot straight up returns tq iev)voz-.00 qlza 8mz ,js1ss/ ggm+o its starting point in 9 s. What is the inite gqgz8 lj m0/oz1q+m-s,sz.sav)i0vial speed of the bullet?

  A ball is thrown straight up with a xcispfaa0+ si p-+yb+pz -s8) speed of 36.0 m/s. How long does it take to return to its starting p8) x acsazb+-ps y0s-ip++if point?

  A ball is thrown downward from the top ofa/mwg,+ x ok(g ,.ymvj a building with an initial speed of 10 m/s. It strikes the ground after 7.5 s. How go a,y.+vkm m,/gjw( xhigh is the building?

  A ball is thrown straightpn tzog7is/8d1jj)( z up with a speed of 30 m/s. (only fill in numerical value insd z/7it8j go(p1znj) 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 intb 2ev-igom-b ). pnw3jo the air with a speed of 45.2 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 trk1t( g).tznfr .k (qthe velocity at t = 1.0 s?

  In Fig. below, what is0kds wg :l0gs2 the velocity at t = 2.5 s?

  In Fig. below, what is the velocity atsl 2ty4mnp 0k: t = 4.0 s?

  In Fig. below, what is the vyu i2rz* v4va.sdyahz(.)v* jelocity at t = 5.5 s?

  In Fig. below, what is the a,.p3xfl ; echmverage velocity from 0 to 4.0 s?

  In Fig. below, what is the average vel4sj+t a csh,pa xo*u+,cu y5e5ocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 sskt2w plk 8l1.?

  In Fig. below, what is the acceleration at 3.lz2 gyo-hfo i,4 .yly;0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s?q, 58lqk.hvwn

  In Fig. below, what is the average accelerasg3a 8he se8d6.7lxxhzdu/)ttion from 0 to 8.0 s?

  In Fig. below, what is the displacementiz0 ja(a7du.8bm +vp o from 0 to 8.0 s?

Does a car speedometer measure speed, velocityri*7d.eops r*lb,w y)fk 9 )ba? {speed|velocity}

  An object can have a varying speed if its velocity is const 2nlq2q.t)dqhant.

  The velocity of an object can be negative when its acceleration isg5hg3j /q-vcqts ie9 ) positive.

  If one object has a greater speed than a second objg k,q7xli 5lzi 9q9+toect, the first must have a gr5i xlt7ol z,q 9kig9+qeater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a k4wvfk,ox-l k12 8sa bspeed 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 rfq,s*aa9m ta-8 j9ubits acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaw.p n8fsmw pdgla g35y;;6(ae q ;k r7mh,kcj+ves the bat with a speed opg m 8rqh,k kswa; ew.;fj5c +(n7 6play3;gdmf $120 \; km/h$. 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, hod ,y gl8w,/)bdyqh +ysi5+mszw does it change if air frictlbmg id,qs,swy +)z5ydy/8h+ ion is ignored?

  As a freely falling object speeds up, what is happening to its acceleration0dczv p+wncf k/61xf 1clb9 4n, how do/b cx+64n kz c1d9wfcpv01fnles it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its qbaev-v,+bm :original position with the same speed as it had initially if air resistance is negligible. If air resimqv+-:eb avb,stance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzz*4si q*ob3 paero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same ,njhl)u1dbvd5 -.kek (i ip z5time.

  An elevator moving from the second floor to the fifth floor zcxy r)pt6-5 v3xltg:yezu +-making no stops along the way has zero accellxt+3xrct)z guy --z:6p ev5y eration all the time.

  A rolling ball moves f e7im9 g)pg ekzruhj:f );r90e/w4uafrom $x_1=2.0 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=2.1 \mathrm{~s}$ 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 $t_1=-4.3 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps arounz;5nbjbcs d+gc*hj6 k(1jtp2 d a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away f hft4su)ko2+ :jzpste+ s/z +lrom its trainer in a straight line, moving 88 m away in 13.1 s. It then turns ae+:/sz)jh tplss2 kft+4+ozu bruptly 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 fromhkml,syu(1j f *b3z hils)e)+ $12 \; m/s$ to $22 \; m/s$ in 4.7 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 froj8hx)(wz,+25 8 lgz ni qvbesbm $16 \; m/s$ to rest in a distance of 85 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed1sbeu:.vp2 f s of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blan m0uwyhp92 *ocks to essentially top speed aboutmwn0a*9yuh p2 $10.1 \; m/s$ in the first 14.6 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 uniforc l c3f/8( l zgvzcp2q,fn3ux;*l 6getmly from a speed of $18 \; m/s$ to rest in 5.16 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid ma tyiy6g gk;lp;01,dcva0 n1ef rks 92 m long on the highway. Assuming a decelet;;gipdnly vg1, fe1y a c06k0ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goirz1afq9ex(f6-o2 edl j3 :ww rng $25 \; m/s$ 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 complbbd5dmd9-ba9*kf vh*ete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runnedv 5bhmb9*9dd -abk*fr must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$