Suppose that an object travels from one point in space to another. Make a comp2:*-fyzc 1ayct ,xbj/ ;mbsjoarison between the displacement and the distance travel1f/ jb *x;2t aycobsj:c,- ymzed.

  When is the average veloci4 vtyvq(b.k zqlx)8. o29 cxq5zg6nnkty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixtyedwhg 2.c, em-0 a2szh in 8 s". h.sh2 2za egce0dwm,- This is a description of

  An object moving in the +x axis experiences an accel(h;f8 h 5o efwbprdj.+v)lq2 aeration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelin35zbt274;kqjjrrpc sg to the East (+x direction) begins to slow down as it approaches a traffic light. cpq4kb5z rj7tjr; s23 Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins (uts+8s +vkxe to slow down as it approaches a traksx8u(etvs+ +ffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a consu) cf.d-0ogl0hww+c ktant velocity. Make a statement concerning its acce)d -fcl0wwug+.hk0 coleration.

  If the velocity of an object is zero, does it mean that th( tc1g: q)(ks, xgxelfma/)gx e acceleration is zero? Support your answer with1/(g(xm:t)x age kgsf qx )cl, an example.

  Can an object's velocity change(v23 ssaw3wa+di;f8xxvh y y/ direction when its acceleration is constant? Support your answer with anhsv3(+isv x28 xyy3f /;awa dw example.

  Suppose that an object is moving with constant acceleration. Ma, k6vb0i;qpba1uvl ,aid v74v ke a statement concerning its motion with respect v1,ub 4,7lak6bv;a ipqdv0iv to time.

  Can an object have increasing speed while its acceleratio sf66;bpbjcf 0n is decreasing? Support your answer with abjf0fc;p bs 66n example.

  Suppose a can, after an initial sf4 e, .x5dmwt0nl/ipa.,ry xkick, moves up along a smooth hill of ice. Make a statement concerw40,lr,a /.mx tpn fdi5 xeys.ning its acceleration.

  Under what condition is average velocity equal to the average tbagr5 5qj(ik8 cpy1c+:od5aof the object's initial and final :y+ 5 r aipcgc5kj85 q(ob1datvelocity?

  Objects A and B both start at rest. They both accelera lwe8v +,c:s- thqmtr+te at the same rate. However, object A accelerates for twice the :mqw,ts+vl e8 +-trc htime as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start fro kwlz*h6 k)ux,rgo+6s m rest. They both accelerate at the same rate. However, object Ark ,xwzh+ uk*) 6g6los 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 /.s3i h5wx rkoand falls in the absence of friction, which of the following is true ciw 3 xks/5.rohoncerning its motion?

  When an object is released from rest and mz7 r.xtwye(pf8 s42kfalls in the absence of friction, which of the following is true concerning its mot8wte.zy2f 7r(s m 4kxpion?

  Suppose a ball is thrown straight up. Make amfd a2) 6wmhw jn2y,y) statement about the velocity and the acceleration when thej) fn2d,m6 2mahw y)wy ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration v+v -j4o(:ohaxns-a jjust before it reaches its jsxj:o-va- v+on(h4a highest point?

  Suppose a ball is thrown straight up, reacq+yzu- sqkqa279z 3omhes a maximum height, then falls to its initial height. Makukoz qam -q9sy27zq 3+e a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its ink;ln l*xj8 nr6itial height. Make a statement about the r*8xnlnk6;jldirection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air ncxi3loo lr-00e;)vj:8s n po.s b9drresistance. Make a statement concerning its 839 irs)pcd0vlnnexl-o j:obro0s; . acceleration.

  Suppose a skydiver jumps from a high-flying pa2 -jhjvys, f)lane. What is her acceleration when she she reav jh ys-f2aj),ches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical 4g n jgb99at weo8qjl607tq/ lsecond ball is thrown upward wilqob 7l 49/tqj6n9tggew8j a 0th 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 from the top of a building. One second lat+o3 s;lh y*tit27vy yser, ball B is dropped from the same iyl*; t+yyh72s3to svbuilding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One sel w*pcn :+xsh5,)6lflxbb v8econd later, ball B is dropped frol5 x w f8p:6sxbblhev*+ l,nc)m the same building. As time progresses, the difference in their speeds

  Two objects are thrown from th(mssc :)n o2 3ogro/vmt3h +s/4en+ahzv9wck e top of a tall building. One is thrown up, and the othcgoom3hsaz 9 +:)rnhvk +e 3n4m(vc/sow s2/ ter is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the 3h zxks5t:0 mbtop of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air r:s 5th0mx b3kzesistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the c203xrh( by 3s;vyqtz+x axis. The position versus time graph of this objec0tvyxy(32r zc q;3 sbht is

  An object is moving with constant he+wmo --0r4czmdr;fnon-zero acceleration in the +x axis. The positird+cm4mzf- ;0e-hr w oon versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velov bnns8yiy-z3yxf),+ city versus time graph of th)z,+n 8-xnybiy3 fvsy is object is

  An object is moving with constant non-zero accel(/g bicthj 6/d0pps 5io+2 hxxeration in the +x axis. The velocity versus time graph of this obje/d t xp/ jp2ishhcb(x506ogi+ct is

  The slope of a position versus time 7ym m+e4.wuxul 2 uy3rgraph gives

  The slope of a velocit hb+hz3 5r ;ow(wqz a.qgf/ho5y versus time graph gives

  The area under a curve in an acceleration versusj: .(uk7y i64rf4ui y,l.ulv2oy biru time graph gives

  The area under a curve in a/(l(yp co+ hry velocity versus time graph gives

  If the position versus time graph of an object is a horizontal *dx wv5f ky h,l4.wtleru5 b)0line, the object is0yww).rk4ld t l*, he 5bvuf5x

  If the position versus time graph of an object is a vertical line qf,mxa7kip)p c*we4/, the object is k4 p 7fp)ew,/cxi*qma

  If the velocity versus time graph of an object is a horizontal line, r5o+wy f k67fothe object 57yf+rwoof k6is

  If the velocity versus time graph of an objecthvf0x/( zdumess3e v3m9 a:9x is a straight line making an angle of 30 degvx xmshe em(a390d: fu/9s3v zrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the+5 dp lkptd( 0kfwk77j distance traveled and the magnitude of the d( jt 7k+kk7ldwpp 50fdisplacement vector.

  A boat can move at 30 km/h in still water. How long will it.t5o +mf molea*u7 yzfe,r+w; take to move 12 km upstreamrow ,tf e ;o+um*zfmleay75 .+ in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi q. 04pbc ke0 cljsc6f6o+ap4 n= 1609 m)

  What must be your average7 b+s46mieyryeh t h,u,h9 kpcqt(3d 1 speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5*b an hd1zs:w*ekfgd c m3;8h;7 min. What is the average speedh;aecd *k 8*s;f:g1hw mnbdz3 of the runner in m/s?

  A car travels 90 km/h. How long does it take f1r5u r5d4uexl;ii h4s h/un09 qkuc.yor it to travel 400 km?

  A ly (light year) is the dis10ijx umqr4o-sxty-3tance that light travels in one year. The speed of l qsx4mu0o1t -ijr3-yx ight 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 jky(w:;m dc))k aake;straight road and you look to the side for 4.0 s, how far do ydk: wa;k a;yk)c)jm (eou travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yourfem/dtpt/99f ui ai /: average velocity i9 :/p/tfaedmf9/ iu tis

  A polar bear starts at the North Pole. Itrp aa7 fsd3(nhdss9lf 7n d5819 s2hlc travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip tal77fas nn98 f2a 1crhs lds5dd9ph3(skes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then9yqkupo)dbzt* o)j. 7 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starjk*b9 )yop.o)t zd7q uting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 milqhz5+)qzj ijt3g v ;* +5xxgh/h for 110 miles. It then starts to l+; j5zx jg5*qh)x hitz +q3vgsnow 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 t78zeak;puaa -x hl 30160 km at 100 km/h. What is the average speed of the motorist for lu8epa; at0k73x-ah z this trip?

  A motorist travels for 3.0 h at 80 kmbzgi *xl ) do6f7-0cpbb1 kv7a/h and 2.0 h at 100 km/h. What is her average speed for the0bk v1oip 7 -xbgdza)b*76flc trip?

  An airplane travels at 3,pz fyo 35zji-00 mi/h south for 2.00 h and then at 250 mi/h north for 750 milesz-fj p53ozy i,. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) fo*6amu-.b8xim0v f jl4 if8 raj)ogai-r 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 t 8*6jaaxbimjufom 8 l4 i-.fi0gvra)-he 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 lose the race?

  A car decelerates uniformly and comes to a sto:(74fh df waepp after 10 s. The car's average velocity during deceleration was 78 km/h. What was the car's deceleration while s 7:awfd4hf (pelowing down?

  An airplane increases itsm69ce m 9ae*ep speed from 100 m/s to 160 m/s, at the average rate of ee9p9c6e * mma$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at vbz y7bo hz:f-2/z t5wthe 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 an5 c2fmhsc ,rpw0+ 6bxgd 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 10aexl2 f4,oa wa n2m:*k s. It then speeds up with a constant acceleratioa4 ew*2a:lm ofn2ax,kn of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initi2kck p5rnyy)b:/ p5k cal velocity of 3.6 m/s experiences a constant acceleration of y5 kpn/ 2kcp:kby 5)cr$4.4 \; m/s^2$. What is the cart's displacement during the first 7.2 s of its motion?

  A bullet moving horizontallyu 03o9jllb 0 ltd3y(rl to the right (+x direction) with a speed of 358 m/s strikes a sandbag and penetrates al l0db9ju03 3rltylo ( distance of 92.29 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched frvkg-6+ ewyxm a3i,u0 tom 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 acceleratiox ,kmw3v0g+uta y 6-ein is constant, what is the length of the catapult?

  A car starting from rest moves with constau821; ;,fh dl izyl2 h ip( aszhf-a4.x8ybbivnt 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 to 80 m/s in a distance of 200 m. What is its averawj0leu 8 cv(* nnym9-jge accelerationnnev 9-cuj w(*m8j0yl ?

  An object starts from rest and undergoesul.efr ,2 aq:t ;y,zym uniform acceleration. During the first second it travels 5.1 m. How far will it travel during the third second l2r:y.f mqzy ;te,,ua?

  An object is moving in a straight line with constant a1orzt) qql+8jz 9s)uf3zs/rycceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 1 91 sr+8tzz)yqo)ru/f sjlzq30 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at 8 yfbjs11,ia,x;nz+ijh.t r z$3.0 \; m/s^2$. 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 g3zaeq k nv 3)/opwz, rwxs60.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 o3hmfc +wx:y,car that has been waiting at the intersection starts ahead with a constant acceleration o:fyhcxw3 ,m+ 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 planet Xjnd7 4 4u.vzdy a py0yx465vww where the acceleration due to4d wzwv5a.47 p0ynujyxdyv46 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 w8qzk nx co3u,)here the accel3xoucn, z8)k qeration 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 spe 3m7qadevqdzyd4 - n;+1mric (ed of 15 m/s on the surface of planet X where te q(vmq-d 3yzrd; 7i+c1a ndm4he acceleration 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 w3 .;, j r vi2xz+wwkahe69j2fb2yz f1p/mlt con the surface of planet X where the acceleratm62vw 3 /fp2b2wcjy1ria. zj;9fxwh,kltz+e ion 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 holdsb0dfsarr /ws 2/4wddjex(1 biy2 4kehp n l155 a ruler between your fingers and s h4sk5rdr 1wp1d5nfdl(x yb aweie2b24/ /j0releases 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 velocity after 3g-qhun8q 4*:4hs cfuq.00qc hu -f44h: u8gnq*sq s?

  A bullet shot straight up returns to its starting point in 5 s. What is /e2 iys2pm3neearoq+ ;,)ksz)l ;aac the initial se)lzm sane;apqosc,;2y)r ia/ 23e+ kpeed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. eu2n1ff/hs:u vd 99 lr How long does it take to return to its starting pd9l :hu 9ns1/e2 vffruoint?

  A ball is thrown downward from the top of a building witkvhve /9 qec1;fx*w z7h an initial speed of 16 m/s. Ifeh1* ;zxk7 /9wv qecvt strikes the ground after 5.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical valbw ; o+;z/vlvyue in/+bw y;zvl v;o 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 n * .knx e2aipn(mh77,fg ;fupup into the air with a speed of 31.1 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vel8ijj /+k9pc vmocity at t = 1.0 s?

  In Fig. below, what is the velocity ovcadhves8m6 5t k0-l ;s7r,yat t = 2.5 s?

  In Fig. below, what is tjfc(q9ouw; + ehe velocity at t = 4.0 s?

  In Fig. below, what is the +a8h+ktdaj p 4v4w*0n w+fqek y.l y4g e6xn/jvelocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.059wpar*7 y(tqxrh c5br *lm5a s?

  In Fig. below, what is the average velocity from 0 to 6.0rt hbtu)m) t(09tfl- l gpad): s?

  In Fig. below, what is the acce nym6, +1day8n itv)alleration at 1.0 s?

  In Fig. below, what is t/no. e-vq+ u q:pu,q ntjn,m0wsfpu78he acceleration at 3.0 s?

  In Fig. below, what is the average vveu8kg/)h y4 acceleration from 0 to 5.0 s?

  In Fig. below, what is th0.m(9ar(0 pchgja; zfr 7aqh je average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemwj:mvb2a ; g.nent from 0 to 8.0 s?

Does a car speedometer measu78ol/owc9cjo2 l:v nq re speed, velocity? {speed|velocity}

  An object can have a varying spez: +k)ln ik(oqed if its velocity is constant.

  The velocity of an object can be negativbj ha1(al9b3n e when its acceleration is positive.

  If one object has a greater speed than a second object, the first dl6c) ft;/hxr must have a greater ac6xr hfl dt;/c)celeration.

  Two cars emerge side by side from a tunnel. Car A is travb.j c41iuw(,b6gtp bb eling 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 increl) ik(fmnif 1n) ;yo xsp ,-tbjpz35h7asing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the ain0 l p9umut,/nr. It leaves the bat with a spmuun9 ln,p /t0eed 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, zt;5x9 ar;p/ws*seyv g*is. ohow does it chz;rswya 9x/v; pits5sg .e o**ange if air friction is ignored?

  As a freely falling object spsf lqbar1n g2 +,t7r.yeeds up, what is happening to its acceleration, how does it change if air frictionrnaf2q+ 71srl,g. byt CAN NOT be ignored?

  An object that is thrown vertically upward will return,h )tvkjd8dk48 s,o tx to its original position w, d88vj4)t s,x hkkdtoith the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocfb z45y 0wbgs0ity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleraq;o9/ c.a*5ti*uqkp- qp5 un :xpoeyi tion at the same time.

  An elevator moving from the second floor to the fifth floor making no stops alo(zgs5.bm;e dj ng the way has zero acceleration alsz (gje .5d;bml the time.

  A rolling ball moves from xxh 4w0+xn. p r;a.m/1d(k dq.rwmbcq$x_1=3.3 \mathrm{~cm}$ to $x_2=-5.3 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.6 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ara loxhuj-oyh63vu9 /1 ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from t5 z;grj1 0szb-rgmk, its trainer in a straight line, moving 100 m away in 13.3 s. It then turns g5r;bzs0z k 1tg m-j,rabruptly and gallops halfway back in 4.5 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 frodoq)f 7zqnd)4k)bvejo 6a;y 6 m $13 \; m/s$ to $23 \; m/s$ in 5.9 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 from ck3e;l gbh 0hdiombq)8d+* 8j$16 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a ua a. ,:biz3u7n0xprispeed of $27 \; m/s$ 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 ca ,1tlxus,-iw pn burst out of the blocks to essentially top speed about -pit1 w,s,lux$10.6 \; m/s$ in the first 12.5 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 uniform5y;bev19fev yy drd*z 9jvo,.ly from a speed of $19 \; m/s$ 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 skid marks 92 m long on the highwajz)v/,jy :rdjy. Assuming ,zdj:y/v)r jja deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckk*u5en5n6;p bnc *hos 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 s/sxan2m*+ idthan 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accele *a simdx/2+snrate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$