Suppose that an object travels from one point in space to another. Make a compasb1pf1-ja5x nvmw0 8krison between the displacement and the distance8vsp m0 1bw jk15x-afn traveled.

  When is the average velocity )px;babddaldmx 9so q/844z- of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their a-tjla-e( ze 7car can go "from zero to sixty in 8 ae(t7zela--j s". This is a description of

  An object moving in the +x axis experience9vxh3 ibijw12; f*ok+ q0hcw bs an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traver glv09e8g3g.jwgzr1g2ac0 s ling to the East (+x direction) begins to slow down as it approaches a traffc r wegg8.a0lrjg9s ggv1302zic light. Make a statement concerning its acceleration.

  Suppose that a car traveling 2bcx eyvx0( j m/j34nfto the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement co njm3fbx 4jv2e(0c/ yxncerning its acceleration.

  Suppose that an object is moving: ) gv+wgl6fxegm vc,1usf4d ; with a constant velocity. Make a statement concerning its accelerat,1fvw du c)+s:gvxl m6g;e4fgion.

  If the velocity of an object is zero, does it mean that the acceleration is6bwq 9;(jwwqi2 a afz8 zero? Support your answer with an a w9 zj aq8wwb6;i(q2fexample.

  Can an object's velocity change dir)t 8bh )xa7: vcguxi6:ibyed9ection when its acceleration is constant? Sub)u8 aicgbdv6h:x 9tex7y :)ipport your answer with an example.

  Suppose that an object is moving with constant acceleca5k,c+y b:k3 sa.joaration. Make a statement concea:s3jcykao ,+.kb5a c rning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? g4yc7+i 9 vsain ; h)7nldzly*Support your ansvla;)h+ng7li7s id4y 9* zcnywer with an example.

  Suppose a can, after an initial kick, moves up along ocixl889- hppa smooth hill of ice. Make a statement concerning its accelerlih8 cop8-9 xpation.

  Under what condition is average velocity equal to d d erun(h;..d4+;khe;fhdw gthe average of the object's initial adgrwu de; fhehhd.+ (k4.n;;dnd final velocity?

  Objects A and B both start at rest. They both accelerate at the samea8n cwsz9ft ,q69ue1t rate. However, object A accelerates for twice the time as o8 9 9wqnzuts1 efac,6tbject B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at be5pr 215./vqbjod ui the same rate. However, object A accelerates for twice the time as object B. Wo5. 5r21u/ip ev jbdqbhat 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 o2r9kdoed/vh :f friction, which of the following is true concerning its :/odhv 9r k2edmotion?

  When an object is released from rest and falls in the a( svg.6byct) vx :r,isbsence of friction, which of txs )(r6v:si ,cytg vb.he following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement abor4,r m :( ,o3o4h *hqxipvgylb9g-jf zut the velocity and the acceleration when the ball reac3, ,lbq*9( m :-x porryi44ovhzghgj fhes the highest point.

  Suppose a ball is thrown lfy88 x)cvjo88p/ zqo straight up. What is its acceleration just before it reaches iq)l8fp8jcv ozo88 /x yts highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to it)vhrn3osr 3*ws initial height. Make a statement about the direction of the velocityr3h3 wrsno*v) and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fas+bwk 4+-.h ux)lnu palls to its initial height. Make a statement aboutk)4lb- uws +puhx.a+n the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resi lz.4js b; zbxe+hvgn6qibm;: lje (+-stance. Make a statement conceb .belj:6(-ql++mszhb;x 4j iz vn g;erning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelermmcbg x,w,kl39pr epm ql/ q77:.cw e3h3s b+jation when she sh9wm7m 3ljb ws.pmeb,cq:3g,qlp c/ 7rxk he3+ e reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical seco t1yf9wu7:gxw nd ball is thrown upward with 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 thftug9 wx:7 y1we second ball go than the first ball?)

  Ball A is dropped from the top of a building. One sep -f:p/p. x2myaz0oxpcond later, ball B is dropped from the same buim:p0zxpyp oa-xp2f . /lding. As time progresses, the distance between them

  Ball A is dropped from the top ofmr d3r/-bq 9 rp npu*:+54cb1ib bdtsf a building. One second later, ball B is dropped from the same build5u sirc+/pfdd3r9b br: 1 pbnm4-bt *qing. As time progresses, the difference in their speeds

  Two objects are thrown from the c gh5vl1nw:l)a/v w)etop of a tall building. One is thrown up, and the other is throavc/w)v5g ) e:ll1h wnwn down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a bk of)c+l:wic+uilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance.ko)lc:++w icf Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The pq(1l(q:u*,2:i4hgry zuuhk dhi ;i cp osition versus time;1 rkuul 4iig(c i:*(u,qhq2hyd hp:z graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The pwjx lap-d(ubs vk29-. osition versus time graph ofsbpluwd-avj.9( 2-k x this object is

  An object is moving with constant non-zero velocity in the +x aag(+fg dy*en- a ri.5axis. The velocity versus time graph of thi(rdg*+iaa 5. ang ey-fs object is

  An object is moving with constant non-zero acceleration in the +x axis. The velo 5ohnndspwc;/l7d ;(ocity versus time graph of th5nh(/so;plcdwo d 7;nis object is

  The slope of a position versus time grapa(7dbe:x0 +qbcqmk q0h gives

  The slope of a velocity ver,v/nia q ky;*22x7lq pq kub22*f ngeksus time graph gives

  The area under a curve in an acceleration ve ,he(trdsi-c- e+nf8frsus time graph gives

  The area under a curve in a velocity versus timg .eu6 pvov1c,e graph gives

  If the position versus time graph 9i ,*yyyf xgzzxy2)1bof an object is a horizontal line, the object is,b1xg )iy2 zxyy*fzy9

  If the position versus time graph ofoawsbe yp+-b3 (k5vu 2 an object is a vertical line, the object isu k2vp-w b 3+byae5s(o

  If the velocity versus ti+grgmtv9yd)cm oxi w80aw k,b 4)4/sume graph of an object is a horizontal line, the object i0) 4+m)9/t8v x k sog 4wbcydwu,rmgais

  If the velocity versus timek6 cahr- c4g/n k(g(yn graph of an object is a straight line making an angle of 30 degrees with r( -( /gah46 kkncyncgthe time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the disth9.ly2bhl j0 ilkv8u 0ance traveled and t9jlu0lk2 .y8i bl v0hhhe magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to movec8 a2 ejsq2x gca/(s7n 12 km upstream in a ga n qcja2e2s87xsc(/ river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 a 5s9albn(8 l f*.rw3es d(wvzm)

  What must be your average speed in order to travel 350 km in 5.15q.jpgx *:.ann h?

  A runner ran the marathon (approximately 42.0 km) in qf3ira;3t: bo 2 hours and 57 min. What is ;f3 ir:btaqo 3the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to o6+ gq92e1v e+igptia travel 400 km?

  A ly (light year) is the distance that light travels in one year, u(o3rm h5)5er5b1 ihx klhsr. The speed of light is53hlh ,ixu )rs rb( eormh5k51 $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 ksar.,64ju.ozq ) hpqbm/h along a straight road and you look to the side for 4.0 qz sr.q)6 j hupb4a,.os, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (40uo5 -pt-r lw.e0 m), in 100 s, your average velocity ise 5 l--uotrpw.

  A polar bear starts at the North Pole.yo+6cqr z 5sgos78 .vs(mex+y It 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 takes 45 min. What was the bear's averarc85m7s(.+yeyzoxso g 6+s qvge speed?

  A polar bear starts y+1du s rrx fobr9:)vsr02i4sat the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 k2 4vsurr9b0+ 1ifdys xo:)rrsm 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 mi/h for 110 miles. It thehi ck vi wcd;amn43 dp8:;,fis1ir8tm,(bgv3 n starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is :vdbg,d1m kcp 8 ,38ii 43rm;;aw is(tnch fivyour hometown from school?

  A motorist travels 160 k ;5xrwp.6**a+j s hkuhxhow 5tlg8; imm at 80 km/h and 160 km at 100 km/h. What is the average speed of h** 5t;lwp5 6xhxrs8ik. jgo;haw um +the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is 7o1xbyaig iz:pc /3,c +qtjhf,l3 x .lher average spee1ci:fjcto ,xl3/x37pb+ ,l.igzyq a hd for the trip?

  An airplane travels at 300 mi5(k7het;njm (+)bd olu e9 jqi/h south for 2.00 h and then at 250 mi/h north for 750 uimk+7;h9o)n5(dbj qjtl(e emiles. What is the average speed for the trip?

  In a 400-m relay race the z pg5o:48aqo oanchorman (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 aoo oqzg5:p48 leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly aeix )lj y03j-nnd comes to a stop after 14 s. The car's average velocity during deceleration was 73 km/h. What was the car's deceleration 0jn )ilex y-j3while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate ogvw0h)shi v ;v g21vvstude19zyz71 3f 71gz) 2vs hsiwhvvevt 0 11vug yz;93d$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratc;dkeytp7-r1 yz7 -ryt tq 0i0e 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 a1g8uk oz2or: rnd 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 with a constant acceli glip3o:2 0lceration2gl i3 pi:o0lc of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.6 m/s experiences a constantid7)z3g(5m8zapz3 le r l sz,z:sc: pz acceleration olz:r 3,c8izzza(5sg lpzs37z)m d:pe f $1.3 \; m/s^2$. What is the cart's displacement during the first 9.2 s of its motion?

  A bullet moving horizontally to the right (+x directio20ny.-n t95g j*h8g oudnkh6sn6pkxrn) with a speed of 317 m/s strikes a nj5t* u 6k02ng g -sr op8h.69xynkhndsandbag and penetrates a distance of 35.96 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. Iccz:) ui1n/ yet reaches a speed of 1/:zy )nui cce42 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 acjx+ol15- k3q p+c tfbhceleration 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 itswkx*s (+ dwxz4uk7 k1q average acceleration 7*w+w s1xqkxd(4zk ku?

  An object starts from rest and undergoes unifoc5y*zttrggu5t;-i a4jx7 )h vrm acceleration. During the first second it travels 7.2 m. How far will it travel during thvh5-at4zgt tu) *iyr5; jxcg7e third second?

  An object is moving in a straight line with constant acceleration. Initially +z j5olis)r8fi*,znsf 7e 5b oit is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it )*ilszffsoj e8b5i n,5r+ 7zomove during this time?

  A car starts from rest and ety.4xv :)b5 ykm,zpcaccelerates 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 decelr uffq/mk9i)cv 6t1s6erate 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 gffd3 hpirk:k b27kg** reen, a car that has been waiting at the intersection starts ahead with a constant acceleratihdi b2 fkk7kg*f3*: pron 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 o na3/q+2j ltlwq8d9xxn the surface of planet X where the acceleration due to gravity 2wdn q8+lxt93j aql/x is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed oib,m;dx3xeve/g 2/8 ej+d gap f 12 m/s on the surface of planet X where the acceleration due to gravity is bpv3d d+2/ g m,iaexxe e8/;jg$1.5 \; m/s^2$. 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 oh:jcw y1l:r x;n the surface of planet X where the acceleration due wylxhrjc:;1 : 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 upw3 /e8*uaj j beabff;h:ard with a speed of 14 m/s on the surface of planet X where the acceleratfj;:bh3 euf/8a*eabj ion due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time v/kef : mdt)j ntmvef(1n r8dr:d.0h) is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it withof:r tnfmj8) vh) kt.d0v1 (r:dme/denut 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 s3ybz1t9zd : 2h x4zyd:dc lu3,o 3pxj3.00 sytb :,lx dd3oz s31zd9zxuj3c :2pyh4 ?

  A bullet shot straight up returns to its starting point i)moj0w ny h )+s7bff1en 15 s. What is the initial speed of the bullet?j+mff ye7)h) n 1sbwo0

  A ball is thrown strata zck9rm:,.pight up with a speed of 36.0 m/s. How long does it take to return .c,pam :tz9rkto its starting point?

  A ball is thrown downward from the top of a bu4c6ios clwd y-/ csm-yp 90,btilding with an initial speed of 8 m/s. It strikes the ground after 3.2 s. How high is the buit dcb6l- / 9-ycp0iwy4ssc,omlding?

  A ball is thrown straight up with a speed ov:1; x-.yy/n gozekw xf 30 m/s. (only fill in numerical value in the .nw xzxkv-oye;/y1 g: 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 bzm t8m :krhd. dk.f*-44.4 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity ats r egvhtd*,kit..z9y1l ;qx7 t = 1.0 s?

  In Fig. below, what i,va0y3 pt.;;i we/1aitiepi us the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t 1i pd.,k bo*j5we -z)vswaw3d= 4.0 s?

  In Fig. below, what is the velonfls/3mxb9) .tur5kot pq)5 gcity at t = 5.5 s?

  In Fig. below, what is the average veloci k0xb/5:3t p:tprv9 werdkp;oty from 0 to 4.0 s?

  In Fig. below, what is the avera+ow9vz4s 7cpp ge velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration an8 icv7co wg:/,wd:z8 fhc5elt 1.0 s?

  In Fig. below, what is the acceleration at 3.0 s?r. r76/oeb zro r57axh

  In Fig. below, what is the averakl w*)sv3mnpqw. 0;sbkk .y t8ge acceleration from 0 to 5.0 s?

  In Fig. below, what is the averag3-b) p/ tai,pr-aq38ox:,x zv3t e(nw cwjfka e acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement frz7(onl0e;bo+kksb(u om 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spee) /nqn5nd l(ehd|velocity}

  An object can have a varying speed if its velocity 8uo 0. 5k ra ey;(m(gccsokzu7is constant.

  The velocity of an object can be negative when its acceleration is positivi. u i:s,an o.acu4lkmr*--m he.

  If one object has a greater speed than a second object, the f 43dcbjaq gsfw08;iy 6irst must have a greater ac iy43gs;6jq 0 afb8dwcceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling wi:f-nk8 5 pimnzth 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 rjve .h8py4 gq4ez9c0its acceleration decreases.

  A baseball player hits a f te02.v bioclup u3fll w8(y9 +6adc(koul ball straight up into the air. It leaves the bat with a speedvclcwk (eo +t.lyp u38fu96l0ab d(2i 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, e3+zq pj6ww,e7)8o pekxdg5e how does it change if qwe3exk,d5ew6+eogzp 7 j8)p air friction is ignored?

  As a freely falling object speeds up, w*wr y be6e4vysbecis 86w,f .3hat is happening to its acceleration, how does it change if air frict*ey rs4yei 6bvwcew,3. s6fb8 ion CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original /n0 w: mrit-yz89t3(kfxaph q position with the same speed as it had initially if air resistance is negligible. If air resistance is apprem xzpa8 n/qi:-yrw k9ht0t f3(ciable, how will this result be altered?

  An object can have zero ve-d2r9 uz,s4*u jtcwtohz1by ; locity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleratuvrfu + vv/(il2ld:: sion at the same time.

  An elevator moving from the spz*h9y ocn.o (na2*gtecond floor to the fifth floor making no stops along the way has zero acceleratioc*z2 9ao (py*htno ng.n all the time.

  A rolling ball moves fn7yuddo6(nyx, jb*h8rom $x_1=2.4 \mathrm{~cm}$ to $x_2=-7.2 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.8 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complet(m4 gb:ba-)jw um1d-we6rig w e laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.8 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 st;hrr3p9 q (e3k kes .w8o6aqigraight line, moving 89 m away in 12.0 s. It then turns abq; 83k.h k9rprwog(3ieqeas6 ruptly and gallops halfway 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 fr12pqe y5n3 kolom $10 \; m/s$ to $24 \; m/s$ in 4.8 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 vt(v oms1il ,z(7lw.e$21 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed8.6w7 ; aphfe)ggac o2 o0zpem of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abb io(fl3gv56 )pcpmp 5out6f5(m bp5poc gil3pv ) $10.7 \; m/s$ 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 uniforc(ae ; sm3mamqbs ,:wy 43uv1mmly from a speed of $18 \; m/s$ to rest in 5.82 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car lvtpl0(ea5b onl f .cye+3tl).eaves skid marks 92 m long on the highway. Assuming a decele(v.py)tl eeb na.5c0ol3+tfl ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goikzm5vb70 qzp9e 43cvgexpa./( c /tznng $25 \; m/s$ 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 i29qdgpi5t rs; n less than 30.0 min. After exactly 27.0 min, there are still 1100 m tgq t ;ds5ipr29o go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$