Suppose that an object travels from o s;w6 wcquye4kyu* b*:ne point in space to another. Make a comparison between the diuwe*4b: c;w 6squy *yksplacement and the distance traveled.

  When is the average velocity of an object equal to the i z,f mx dw 8)eu:oke)1dn2zsq;nstantaneous velocity?

  A new car manufacturer advertises that th+ime 6f;o;a2e8 jf mcyeir car can go "from zero to sixty in 8 s". Thim;ef+ c8myofi e ja6;2s is a description of

  An object moving in the +x axis experiences an acceleration oaxxrz //ft lol5fv;4 0 1 m/wlffh3ue+f $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dire t *cj0ky o9 p;utkgd6)z1i)xvction) begins to slow down as it approaches a t9v)jtdokc k *z1) tug 6yx;0ipraffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slowalrp 1w:eoj 2c mq5r)6 down as it approaches awcl p:516a2 rmorej) q traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statements,cty ) -k) 5y1ykxq j*b2ufrq concerning its accelerationyq 2k) ,yqt*5f cr- s)kjby1ux.

  If the velocity of an object is zero, does it mean that the aovueq(h 1m 58jcceleration is zero? Support youj8 ohq ev(51mur answer with an example.

  Can an object's velocity change direction when its acceleration is constan28y,q+f zcyjet? Suppor2qc8ej+f, yy zt your answer with an example.

  Suppose that an object is moving with constant acceleration.xeptyq e(w d8-*o w:4o Make a statement concypotwoe(d-* xw8 e 4:qerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreki 529g*j wm:uy tt.wqasing? Support your answer wiw5 iy uw:.jgqm2t*tk9th an example.

  Suppose a can, after an initial kick, moves up along apo 5n9ezqlrro7 dqn.4rq6 k 65 smooth hill of ice. Make a4d7qko5q6 .n z95r lrqoeprn 6 statement concerning its acceleration.

  Under what condition is average velocity equal to the average of the ob ;4 h/zjfp ,+zdoy2zpfject's initial zydpf;+,2/o j4fzpz h and final velocity?

  Objects A and B both start at qakh5 0e(zv*g rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object *v ge(az5hk q0B. What is the final speed of object A compared to that of object B?

  Objects A and B both schjzo52 mal5 zz/q 48jtart from rest. They both accelerate at the same rate. However, object A accelerates for twice th/5lmz2 5c4za hz8q ojje 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 absenceln+ oyp6d/m xv4: zt)y of friction, which of the following is true concerning i d46tp/noyz):vyx+ml ts motion?

  When an object is released from restfic(aho ;l e/ks w;2(t and falls in the absence of friction, which of the following is true clhik f;o/t(( ;scawe2oncerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the 9.)olnvm6b xxvelocity and the acceleration when the ball) xo 96lbvm.nx reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration +;.9etl sntyajust before it reaches itstnlt+ seya. ;9 highest point?

  Suppose a ball is throxq.xk4 6qas e*wn straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and ac. k aq46eq*xsxceleration as the ball is going up.

  A ball is thrown straight up, reacg*(efgachl 6h(ru ,)jn;, n hbhes a maximum height, then falls to its initial height. Make a staten ,a e;fhuhg)l j rbc,(g(n*h6ment about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward inv,uz1;o,ty of the absence of air resistance. Make a statement concerning itvzo 1 ,yo,fu;ts acceleration.

  Suppose a skydiver jumps from a hwrd5 p vxrae636(.losigh-flying plane. What is her acceleration when she she reaches termina36xpwlvr.r( aesd 65 ol velocity?

  A ball is thrown vertically upward with a speed v. An idenqne6+9a6 y usgtical second ball is thrown upward with a speed 2v (twice as fast). What is thea6qg9e+6u y ns 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 buildinv4g px01d plw:g. One second later, ball B is dropped from the same buildi pxld:pg01 wv4ng. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One secone r+n/8.gl4)gc */spsi+ 8ei ishbcimd later, ball B is dropped from the samh*8 sips )rcni g m.lc8ibg/ 4+iese+/e building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is ti856(xm llaqu+jgk 7e hrown up, and the other is thrown downexl ma 76q(5+u 8jgkli, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a b /mzfprj1ka8-qb p65huilding. A second brick is thrown straight down from the same building. They are releasepka/1 b q5jpmh8z-6frd at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in t.jws2u/g 6.b 4s qlz axr,xm2the +x axis. The position versus time graph of this objecs6wxrxt za,2.b/4gj 2q.suml t is

  An object is moving with constant non-zero acceleration in di58o 4yz za9kthe +x axis. The position versus time graph of thisy5z ki8adzo49 object is

  An object is moving with const ht51wd1 sop afxvr:/ld64b5hant non-zero velocity in the +x axis. The velocity versus6v:a 5/wp fx5d1s1bdlh4thro time graph of this object is

  An object is moving with constant non-zero accelerationc7z85 jzs pk3k in the +x axis. The velocity kjz3cs7 k85pz versus time graph of this object is

  The slope of a position versus iqha*7d(,w4ksd9m hjp99btu time graph gives

  The slope of a velocity versus )ifb jv+f q9xj(c-q+vtime graph gives

  The area under a curve 6m 3basz4wi/9 e,ifgx7de 6x5yfjp3oin an acceleration versus time graph gives

  The area under a curve in a velocity ver6:iu d+rxdr (sa4 /icjsus time graph gives

  If the position versus time graph m. (s8se.oya vof an object is a horizontal line, the object eo ms.y(.sv a8is

  If the position versus time graph of an object is a vri4:gjn8 xbu6 ertical line, the object is 6n 8rxjuigb4:

  If the velocity versus time graph of an object is a hf7( 0 wb0e3hadde 4i:n 3stbxborizontal line, the object is4tb :bd0s 30w an3ehxeb ifd7(

  If the velocity versus time g:i e;c2sts :-osw ko*praph of an object is a straight line making an angle of 30 degrees with ssoiwt2pc- :k ose:;*the time axis, the object is

  An object moves 15.0 m north and ths8 h nm j:b,x*y1ke*sven 11.0 m south. Find both the distance traveled and the magnitude of tyvjexb*s*:m8 ksn, 1hhe displacement vector.

  A boat can move at 30 km/h in still water. How long will it takeqll d-iq8xl(4u: xch5+ j0 ptt to move 12 km upstream in a rivuqli48t ll:-5qth xjp0dc(+ xer flowing 6.0 km/h?

  55 mi/h is how many m/s?ta;w2 u2xb i9e (1 mi = 1609 m)

  What must be your avne-k-tj oa+g/erage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon zjg0)5. bkbci (approximately 42.0 km) in 2 hours and 57 min. What is the average speedj)bkib5.z c0g of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tramhyo*f/5x1tr l/a +fkvel 400 km?

  A ly (light year) is the distance that light travels it *3q,2xe7z8hpmorjg n one year. The speed of lptjho 3m r28q*zgx,e7ight 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 j jkpmgdv3lwo 1m;e2. 5m;8uj straight road and you look to the side for 4.0 s, how far do you travel during this inatvjm5o1ug ;jdmew8lkpj. 32;m tentive period?

  If you run a complete loop around an oli:x( 15wze j3a/xyxt* w r)nputdoor track (400 m), in 100 s, your averax) :jw1x*pnt/ra5iyw x3el z (ge velocity is

  A polar bear starts at the North Pole. It travelsq2 c(hhvnwr ,/ 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its star2q c h(n,rw/vhting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travfzr8bk 3r0 c/b ,pnrt7els 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 takes 45 min. What was the bear'7kzb3/nrf b rpr,80cts average velocity?

  You are driving home on a weekend from school at 55 mi/h for 11 .x ntf.1)vhcn, kiq(h0 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutesn.( kn cti1,fv)q.hxh. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is nf(1+et8mnrg8d tvm:to , fd+ the average speed of the motorist for this trint18(+:nm,ddo+vtf mt8r gfe p?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at k fdw xh4ym2g*4 ttt;:100 km/h. What is her average speed for th m4dgfxt w;4yt*tk:h2 e trip?

  An airplane travels at 300 mjr5-s3jpik;bjbg53 1hp lvr . i/h south for 2.00 h and then at 250 mi/h north for 7;lbsh3kp3.b-gvi5 5pj jr1 rj50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the lastrd*mz4r9;h (k i1bj/td3mcob 100 m) for team A can run 100 m in 9.8 s. His rival 4; hm(dm9 od13tzkrr*i/bcj b, 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 runner not lose the race?

  A car decelerates uniformly and.mvxjl*ovz ,emrps9 b:b,8 q7 comes to a stop after 13 s. The car's average velocity during deceleration was 58 km/h. What bb:* ovqrl,sp9 7 jxz8e.mm,vwas the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/akaj b)w-3s 8ozqr3o) s to 160 m/s, at the average rate of k8wqboa)33 )o rasz-j$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate om5dq 2xnh ;ee) ux;x8df $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from res/z-wbl b)) qratmm( h5t 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 z /4 cx r897sbhezijri4)q)jq for 10 s. It then speeds up with a constant acceleration 9eri4iq7 )h)zrs j 4/jx8qczb of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial f:-iw,othzs2 w.kme( velocity of 6.5 m/s experiences a constant acceleration of (- if2o,htse:z mww.k$1.8 \; m/s^2$. What is the cart's displacement during the first 9.2 s of its motion?

  A bullet moving horizontaleqft2y57bd+sryj 96( y rzr 4jly to the right (+x direction) with a speed of 530 m/s strikes a sandbag and penetrates a distance of 24.44 cm. What is the average rbyjtyrf9z(254deysjq6r+7 acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraf cgwbf,fa qt-wd/h1*5 0jhny2t carrier. It reaches a 1b2-dwqa t hjn ff yhwc/0g*,5speed of 42 m/s 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 movesz37 z bwqvqd4n60w0z x 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 to 80 mn vd .un)dim* 83yw5fo8 ox(cxx1oca;/s in a distance of 200 m. What is its average accelerat.icyfv nxu8nwo )dcd5a xm81o*3 ox;(ion?

  An object starts from rest and undergoes uniform acceleration. Durin ;.x/ohp kki)ug the first second it travels 2.5 m. How far will it travel k/pixh;u)k.o during the third second?

  An object is moving in a straight line with constant acceleratf9v9nm1(.b sfvsl )zulkzmih54)k 5qion. Initially it is traveling at 16 m/s. Three seconds later it bmk)v v zf s (kmunzh 5qsl)1i9.54l9fis traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acceler8obl 8bbahe *un07*azates 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 roadffb/eh (z c)fo z7*gs,tjp9sp7 zs; *apdr,.d 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 been waiting at7v(igpy4 v8s p the intersection starts ahead with a constant accevv7p4i8 gy(spleration 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 of2z*1rw+8d 7+ vzezi ua )wbdei 12 m/s on the surface of planet X where thea*ivd+weze zd8 2b+7rwizu1) acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upw+pys83 e4jpnlg akgvxn qu3h a;2;0+ mard with a speed of 12 m/s on the surface of planet X where the acceleration due to g+;8maasg vpp3lyj ;gn23hx keuq4 +0nravity 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 slbi)tq 4 +:nb atc+7wwurface of planet X where the accelerwt7):l+ wn t+c qb4baiation 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 spij0 8mcc a3:iyeed of 14 m/s on the surface of planet X where8i0i 3cm: aycj the acceleration 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 rui:y ynt;+mf1*cf+h rqv 5 7wtrler between yh 1r5iq vfc w+yt+;*n rmyt:7four 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 io 60k4bt9ev w xtmh1o;ts velocity after 3.0h o 49xb1m0ve kwtt6o;0 s?

  A bullet shot straight up retur zg2c6fa 9sdea(pj7v.ns to its starting point in 9 s. What is the initial speed of zfc pa de as(gj7.9v26the bullet?

  A ball is thrown straight up with x n6ajuoe-m,+a speed of 36.0 m/s. How long does it take to return to its starting pajm+,6- e nxouoint?

  A ball is thrown downward from the top of a building with an initial speed jrxb), k 5g2plof 12 m/s. It strikes the ground after 5.9 s. How higlj)kx,5 g pr2bh is the building?

  A ball is thrown straightun3;a(csalc) ;4h px y up with a speed of 30 m/s. (only fill in numerical vals;ph x)c;a a4 nycl(3uue in 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 thet*bk1 -th+ rijg+j3 ut air with a speed of 39.0 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the8 le3k8.sflk 6fpwkouk,0f nvs7y8c8 velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t =0s n:klyqu5 6w 2.5 s?

  In Fig. below, what is the ver wwx *be.*lsb2y(r/g sj xzqg:f72 6wlocity at t = 4.0 s?

  In Fig. below, what is theh zvr+kyjt*598e qp4k) z* ftn5o d:cj velocity at t = 5.5 s?

  In Fig. below, what is the wpsj)xt(5 9peaverage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to ,lt;b2jo7 my b6.0 s?

  In Fig. below, what is the acceleration at 1.rjbz;w, n8kvc)d0aesv s; *if8,pa)z0 s?

  In Fig. below, what is the acceleration a* o(z5lzq- jdip1uu q6t 3.0 s?

  In Fig. below, what is the average accekp(b ,hrcuz a ld*9/0w/j/akj zac bg9 wto*91leration from 0 to 5.0 s?

  In Fig. below, what is tiwc) xg0 n(mj8)fa /oshe average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacements 0m2r;4cb; dhvn)r ni from 0 to 8.0 s?

Does a car speedometer measure spo,q dp +amp-y7l 2qp5eeed, velocity? {speed|velocity}

  An object can have a varying speed if itjw h+f 3ddz(a3o 1g3ggs velocity is constant.

  The velocity of an object can be negazvi- qvg m1+*b hic0ssg+96ritive when its acceleration is positive.

  If one object has a greater speedadd yj39z-hfr2n )iv) than a second object, the first must have a greater a izddf-j) y3 hvn9r2a)cceleration.

  Two cars emerge side by side from a tunnel. Car A is tg/m q(79 l ndfkpy90nrraveling 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 tin o;xt *l7tyej6:s )acceleration decreases.

  A baseball player hits a foul ball straight up into the air. ux.d s7mieurhx(7*:c It leaves the bat witrh*.ei(7d cm7:uxsxu 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 object speeds up, what is happening to i/k 4nz t xq(v,iu.b) b *6p6fqeugu/wfts acceleration, how does it change if air friction is ignored?uvq)u/6nfew6x ( f,pg4 kb .bq*z/uti

  As a freely falling object speeds up, what is happqnlw2a+ 2:e.j8yi qsp ening to its acceleration, how does it ch2i.wy:j2pe8a q ln+sqange if air friction CAN NOT be ignored?

  An object that is thq j3t.uii- d4sht2n qst.1mp tlh4h;jq u67b. rown vertically upward will return to its original position with the same speed as it had initiallytj ujpl-7.t1q n h42him ;siqt .quh36.sd tb4 if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acces0vj/3dqeim gp91ii8 leration at the same time.

  An object can have nonzero velocity kw*c mp7/sg)zoqxpo m -zf03/r.htm/and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth flook:4u w1 wx0s9ycjr9inr making no stops along the way has zero a x9:wsj9rkc ui 10ywn4cceleration all the time.

  A rolling ball moves from jjqhvd e h8+m(rcj1)ir2y,x ($x_1=3.0 \mathrm{~cm}$ to $x_2=-8.1 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete dynq94()s f rw19ybek laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.1 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 line, movisnes vw s9i, 9x.6h3tzng 92 m away in 10.3 s. It then turns abruptly and gallops halfway b stsshe3 x6iv,zw9.n9ack 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 fromvt538mpyot* p(w-t rqb) *qq f $12 \; m/s$ to $22 \; m/s$ in 6.0 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 frod8j 8y0o : llgn4aupt0m $15 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach avppx *iq 86hi,b vf.w 7oti7)o speed of $29 \; m/s$ 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 essentia b 8 z3 vun:y56qh,u6xubk(savlly top speed about xvsu an3bu(vq 6 5,u b8hk6:zy$11.4 \; m/s$ in the first 11.9 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 ca.r+b8lhr 8 l1k4pgbq4k f)yfrom a speed of $20 \; m/s$ to rest in 4.49 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 lq1 71lwswfs7pn3 u*g m long on the highway. Assuming a decelq1lunf13g77*l pswws eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goinggi- qf8r2 zfe- $25 \; m/s$ 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 compleaq t8l1xoi r 7531rswjus2v,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 runner must then acceler3x5tw11s rqiveol7 j8s2au ,rate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$