Suppose that an object travels from one pointslmj a *pf/p qb9iqh+d8:a 5k7 in space to another. Make a comparison between thl89ia+5pk : d7 a qq*mpfs/jbhe displacement and the distance traveled.

  When is the average velocity of an rw/ m/g i7p75d,idaxqj*spw)object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero t dk+0w): ryapao sixty in 8 s a)k0 ydr:pw+a". This is a description of

  An object moving in the +x axis experien3k2f;zxh)q / jsc2jnk ces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car t-r o6 icdi xqfe0,n5p7raveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concernp0inde i-ox5,f r6cq7ing its acceleration.

  Suppose that a car traveling to the West (-x direction) begins tui mzv2nv,r0t,3 hzo 7stm 4i5o slow down as it approaches ,n,iu03zvi m5ht4mt 2o zsv7ra traffic light. Make a statement concerning its acceleration.

  Suppose that an objecclhwf5)a +7jr0 mm v6a2u, uhht is moving with a constant velocity. Make a statement concerning its acceleratiohmj6 av 2mu7 5hfac,)u 0hlw+rn.

  If the velocity of an object is zero, does it mean that the acceleyroky; ni4 o f)c//5kit 1j9fwration is zero? Support your akk 9ny4 r/5i/yofwo)jtif ;1 cnswer with an example.

  Can an object's velocity ch 6sbu739nfz i9czb kj9ange direction when its acceleration is constant? Sup9b 39sfb 6kij7zuc9z nport your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a stater :xq ,vknkoa*jv8v z4o0y.9wment concerning itsvy 0j,89rvqvokx: 4.oa* w nkz motion with respect to time.

  Can an object have increasing speed whil1hwrm 497vm-w *(dok p pa)zyhe its acceleration is decreasing? Support your answer withdm19ay4vp wwr(*7 h ho-p)mzk an example.

  Suppose a can, after an initial kick, mov6)dtz r2im+m0cg re1 ves up along a smooth hill of ice. Make a statement concerning its ag2zmid+mtc ev 10r) r6cceleration.

  Under what condition is average velocity equ* 4v v tl:lv7zqmw;+ggal to the average of the object's initial and finlq4vt l ;* +m:g7vvzgwal velocity?

  Objects A and B both start at rest. They both accelerzogf/ j-7imj/8o9cu)6y bhdkate at the same rate. However, object A accelmj9/o/ o7k)8dyu -c6i hjzg bferates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start f;uo1pt m1nnn9ynos (9rom rest. They both accelerate at the same rate. However, object A accelerates o 9 n (myp1un9t;1snonfor 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 falea .o u0x4)gagls in the absence of friction, which of the following is true concerning its motio ug.a xae0o4)gn?

  When an object is released from rest and falls in the absence5 i i(b z i6)v:mvswwl.-disvx3 z(p4e of friction, which of the fow(3 .4v(z:li)ivpmzbii5s-v6dewxs llowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the wybj .bk t)z42velocity and th.2bj4z bwt)kye acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleratimawin3l :x0ots:: d4fon just before it reaches its hxw3s fola4indm::0:t ighest point?

  Suppose a ball is thrown straight up, 7/-jdq4 e5h3 fruu0r,fkawbereaches a maximum height, then falls to its initial height. Maefruhd-auw j/,47 3e0 r qfb5kke 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 he1bt.))w 9cbw a0 fmpdfight, then falls to its initial height. M0a w9)mfdf.t)p c1w bbake a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is throw. zw o+khdei dzn9o/u 7gos542n downward in the absence of air resistance. Make a statementhz+ 2. z9ooe74isugn d wo/d5k concerning its acceleration.

  Suppose a skydiver jumps cf9njb nya; *9from a high-flying plane. What is her acceleration when she she reacn9 *yc;af9bjnhes terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball i57c dcsv . e*uzek)*ics thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum heigde*ke.vi)7 cs *uz 5ccht 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 later, ball B is dr1a--yzqoa / qqopped from the same building. As -qqq- 1ayzao/ time progresses, the distance between them

  Ball A is dropped from srs,0b vwdeu*n3)3ge the top of a building. One second later, ball B is dropped from the same building. A ue,w3 *eg)nvs0bsd3rs time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall b gybh3- u:ut,oen9d 0bp4rz ;vuilding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the stzop 0tu9 bgu,;nbvr:3dyeh -4reet?

  A brick is dropped from the top of a building. A 3btgac8 z2y,s second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the ty83g bats2z,c wo bricks.

  An object is moving with constant non-zero velo lqioia5;re3 ,city in the +x axis. The position versuaql r3o5,; eiis time graph of this object is

  An object is moving with constant non-zero acceleh a)r+jp 5u2dfration in the +x axis. The position versus time graph of thpdfu +j)ar5h 2is object is

  An object is moving with constant non-zel bgl6 nz7 66dqib/ou*ro velocity in the +x axis. The velocity versus time graph of this objec nd*z q6/iob67 6lgbult is

  An object is moving with constantftm5o 5;)rsov non-zero acceleration in the +x axis. The velocity versus time graph5rm; v)s f5oot of this object is

  The slope of a position versus time grap*jebls+v x(f,9ik6i4zz dcuah 2.6 omh gives

  The slope of a velocity versus time graph givesce8xjj6(,eg u7bk hh+

  The area under a curve in an acceleration versus time grw t(7-re0kqczaph gives

  The area under a curve in a velocity versu06 i3t mgso jcs(og(-rs time graph gives

  If the position versus time x+6wy) oin.oq graph of an object is a horizontal line, the object isn+qxwo)y io. 6

  If the position versus tim(iap,omt + r/te graph of an object is a vertical line, the object is optr it(ma,+/

  If the velocity versus time graph of an object is a blksjzt. mb8:v0e )l zk0 *nsi9a6k;whorizontal line, the object 9 nja ) 0vk6 ;b*tsw.k0kiemlbs:z8zlis

  If the velocity versus,/x9w) :nt dnn q)qbuk time graph of an object is a straight line making an angle of 30 degrees with the timexdu :n)kqtn/,w9nb )q axis, the object is

  An object moves 15.0 m north and then 11.0 m 9xjw kz0bq q/;south. Find both the distance traveled and the magnitude of the displacement vec0q/wjbqxk9 z ;tor.

  A boat can move at 30 km/h in still waterojzj :v.q6f0 w(0a lmi. How long will it take to move 12 km upstream in a river f 6o z lam0qj(.jw:0viflowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16 zla kd0tqzq9q:)- 78uu sm1dy09 m)

  What must be your average speed in order to travel 3gh+hj f+jxxy lu/2 (3v50 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5t./)drfrh7yw . a 3)u,pjxhvl7 min. What is the average speed of the runner in jp..7,lrx u3)vy)f twr a/ dhhm/s?

  A car travels 90 km/h. How long does it take for hjm/a 6(,uu qwlec947q0eumh it to travel 400 km?

  A ly (light year) is tr ska0w3pw; ov;m5mc,6:f nb ohe distance that light travels in one year. The speed of light if;m,mco;kv3b0wasonw r 56 p:s $3.00 \times 10^8 \; m/s$. 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 sib) ,e+vq8q)p w6b gsgbsx+y8gde for 4.0 s, how far do you travelg + ,+8)s)q8xbg6bb spyvgeq w during this inattentive period?

  If you run a complete loop around an outdoor track (41jw bc9 bz b9ay/c2 xbp5gp+3n:lk0xz 00 m), in 100 s, your average velocity abx39+/j0c:9p1k bwgl zbpb yzcn5 2xis

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km 8vk:nm i d*aw*east, then 1.0 km north, then 1.0 km west to return to itsi * mkdvw8n:a* 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 -vs: *ic d74 5h(bzqevo t)v lqgi9v,dsouth, then 1.0 km east, then 1.0 :9-voivqdvg*e7) 4ihd tv z(s 5lqc,bkm 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 school at 55 mi7le-gy(sc ivp 0lf8/ g/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 minu( g-v0 plflei8/7s ycgtes. 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 the h5(ra48qk su7;fxg yw average guqx5;skf 84(rhyaw7 speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. oop;p-44 b yd3xzt)d y What is her average speed for t4yxp3 ; -oydt4d pbzo)he trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/ht71: -l najcb gn-p8dx north for 750 miles. What is the average speed 1 jl-a:d-8tnxn cg7pb for the trip?

  In a 400-m relay race the anchorman (oih2chilyjovl/11 n cj+.az-07 q+zt5cu 3i zthe 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 whehlz-ti n 1joy.uq icc/j0 +c5vaz7h 2l13oi+zn 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 uniform(l- ccwx a4vchf( +dw0ly and comes to a stop after 13 s. The car's average velocity during deceleration was 69 km/h. What was the car's deceleration while slowing dodh+ lfcc-vw 40ac(w(x wn?

  An airplane increases its u:zh+ 3 9afxqdspeed from 100 m/s to 160 m/s, at the average rate of f9 3qxha +udz:$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate o x. r*b88l1cydvrr+*rval+ f if $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and acm,b dr .+u+bpz 6tt-dfkul 3/ncelerates 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. r *d6sqkj( y7 g1hf)m9b 6hvkn It then speeds up with a constant acceleration ofjqmk h n6fh*r7 d1s9k) y6g(vb $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.8 m/s experienceggejp;h5x f.3t;xkkfkobx w1h4s 74 ;s a constant acceleration ok3f; efk5x.goxs 7;1kx4jhgw b4htp; f $2.1 \; m/s^2$. What is the cart's displacement during the first 8.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spe puzf-,is tzu/+art 58ed of 399 m/s strikes a sandbag and i-utr p, f/asut+5zz 8penetrates a distance of 77.22 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It r/ g.y*t yfi;;2ohj anieaches yfn*ot agh./2ij;iy; a speed 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 moves with constant accelt,9 gsq- 5auvleration 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. Whox2ol +mg6 18kb: fsrjbiz8l8at is its average acceleration?o8kz8ob+xsfl1b r g6l:2 i8 mj

  An object starts from rest andnh,n8;9o uuas7by-9fi ;fo si /9f qdh undergoes uniform acceleration. During the first second it travels 4.6 m. How far will it travel during the thi y;9 soff7uo99iqhs;au 8ihnd/n -fb,rd second?

  An object is moving in a straight line with constant acceleration. Initially / ncmhh17l hz4/2nqohit is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move durl/nh4n1 c h mho7z/h2qing this time?

  A car starts from rest and accelerates uniformly ua *6su*8k nshe9k 6rifk/tt9 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 att+j2fcf*, fhifb564cuz/ qp j 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 gr ;don*q-zu+e/ ,rf7v4jl t ijieen, a car that has been waiting at the inu7,odfv/-;zj+i jlri 4n * qtetersection starts ahead with 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 ux1khx-o1+t2mdn tgv( pward with a speed of 12 m/s on the surface of planet X where the acceleration due tom(+2-k htt1x1no gxvd gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwj.af0zzd( nxt+, h0bk ard with a speed of 12 m/s on the surface of planet X where the acceleration due to grdz ,z0(han. f+jbx0ktavity 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 pls1ry5urw *+0mla i 1zianet X where the accelerm5*wl ruy1i1z0as r+iation 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 sp2ulp)fnl/ypd d;r5 4b i fw-8peed of 14 m/s on the surface of planet X where the accelebr 4pn2w 8d5uf;f-lpld yi /p)ration 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 ruleu :h )afr o;9y2 pblwia;y4k xf+1ln;tr between your fin+9)k 1al f xh; :woyrt4a;n2pfbly ui;gers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward9(d we2b2-c 2mldos8n4u hda d at a velocity of 19.6 m/s. What is its velocity after 3.00 s?9duw8d- 4ldbh2a cn ms eo2d2(

  A bullet shot straight up returns to its starting point in 12awkzar (rv6 ;8 s. What is the initial speed of trzkwv26r ;aa( he bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Hx bmw nc6;3,lzow long does it take to return to izx 6n ;lb3,mcwts starting point?

  A ball is thrown downward from the top of a building with an ini2 s iviv,+ca1ptial speed of 8 m/s. It strikes the ground after ,s2avci1 pv+i 2.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numqgrq -qg-g3 d.erical value in the b -qrq g3gq.-dglanks)
(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 aird6*jo(ym ke x5 with a speed of 34.3 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 velocit4usipk;)b itrk 9/ke ;y at t = 1.0 s?

  In Fig. below, what issco9bjhtm) c;4-a o*u the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4. ov 7,3 heef*q. .oeiuyatoa4dp9r,x *0 s?

  In Fig. below, what is the velocity at t = 5.5 lb68l;:irhf+ h7i:vgq r yx:w s?

  In Fig. below, what is the averageikq5:: r )btxc velocity from 0 to 4.0 s?

  In Fig. below, what is th r3x6.esht l-ie average velocity from 0 to 6.0 s?

  In Fig. below, what is the :*u8 cjad p9raue: q:qacceleration at 1.0 s?

  In Fig. below, what is the accelerl70g gbf1hs p(ation at 3.0 s?

  In Fig. below, what is thebd 7 3ldi9+cfy+g s )b,e9hgdy average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 hdeye8x +y63r s?

  In Fig. below, what is the dispmankvc3+ wyjg7) u2br gs1c(9 lacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spf t,fin8v 9h)beed|velocity}

  An object can have a varyi cce;dta7ih/ v)u5. jyng speed if its velocity is constant.

  The velocity of an object can 2tn 9+ -n+y0vyydfzlo )ngfrr6x:pw4 be negative when its acceleration is positive.

  If one object has a greater speed than 1o;g 2f2auyto)c+hc r a second object, the first must have a greater acceleration.1f ocra otcgyh;2+u) 2

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed o 11v b3lozkli3f $60 \; km/h$ 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 ae9,b2f cb k7zdecreases.

  A baseball player hits a foul ball straight up into the air. :wlu/ sm9qr1t*eitb2 It leaves the bat with a r*29w:ie ut1b/lq tms 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 its acceleg* / d7gmrwz6 ja dehj-*m uf r70n1n:ffgr3e/ration, how does it change if air fj6w* g 07rz* g/f7:n1egmmean dr /j3fu-frdhriction is ignored?

  As a freely falling object speeds up, c(y(-q clmpi ) qm,ly b4g9i2awhat is happening to its acceleration, how does it change if air friction CAN NOT be ignore,b( g li2icma9q4y() y-l qmcpd?

  An object that is thrown vertically upward will return to its ortyuiitx. (y;wg o7.6n1jn ,mwiginal position with the same speed as it had initially if air resistance is negligible. If air resistance i(.nuyy i .wow i;t7jnx1,mg t6s appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelerrm:gm(9. g jfnation at the same time.

  An object can have nonzero velocity and zero acceluzyaws. )ag )3eration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops allhfqhd87ysqz ar:yn .p(2 v7 8k5 t1wgong the way has zero acceleratioy2f1 k8hsp( yhq. ar dtl7vzwn q587:gn all the time.

  A rolling ball moves fr:38hv8/i 8)-yad jv wrxsttndom $x_1=3.0 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ 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 $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile9c yl)vql0zz ( ($1 \; mile = 1609 \; m$) track in a total time of 10.5 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, moving 98 (dr93 vx/vy mjm away in 14.0 s. It then turns abruptly and gallops ha( 9rmy j/dxvv3lfway back in 4.6 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 fr7m sj4qd e6spd4oars ni:568 gom $12 \; m/s$ to $24 \; m/s$ in 5.2 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 yb1gg*yis(x/ $16 \; m/s$ 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 speed0,d,tmressj1:y ; )k+qbe(;l5lzj/rq d nmyc of $29 \; m/s$ 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 the blocks to ess+ qyg(vac *jv(entially top speed about q+vjg(cvy* a( $11.3 \; m/s$ in the first 10.2 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/lor jz0ly4y( speed of $18 \; m/s$ to rest in 4.61 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 highway. As1 (l2vhbsp:7vq zfof0 suming a decelerationzloff1s(h2vb vq: p07 of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goivjx, 5o3 kq58.m(:be u+t)txjwk avdjng $25 \; m/s$ 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 xjp3 lf tmd.q j/shfurc-ist:)3 6/8y30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerr s.scu33f jmitx/tfd -j8 6lqp:/hy)ate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$