Suppose that an object travels from one point ;is /5f) drh4 6f-hfiftxct 9min space to another. Make a comparison between the displacement and the distanc5 f/; hht rx4-id6it9ff ms)cfe traveled.

  When is the average velocity of an object equal to thza4 +ddwtz7 -ce instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero tfua03fzs(is gx: q( l+19iafo o sixty in 8 s"iilfqx:oua13ag((fz + f9ss0. This is a description of

  An object moving in the +x axis experiences an acceleratio l a6grv.gue( eg*2hszmb5 n//n of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to tx8jttfle3 fbacd +9s5v*zyw t-.+ zw 0(y0cbthe East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its +0(j8v t- ttxf*5sw ba9z ez.3 cwdyl+cb tf0yacceleration.

  Suppose that a car teij 6ji. uc-y64: lrlnraveling to the West (-x direction) begins to slow down as it c ili -.:jeu66yjrnl4 approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. q;d4wg.a +y8npzcwsrp:-8jdMake a statement concerning its acceld8nwzjc4.rsp;w-8+y :qpa gderation.

  If the velocity of an object is zerqis( h: 3y(jspo, does it mean that the acceleration is zero? Support your answer wiiq h(3sjp( ys:th an example.

  Can an object's velocity change directi lbiqnz/ -z+p+on when its acceleration is constant? Support your answlpqn -z+z /+iber with an example.

  Suppose that an object09at de oo ,,o4osn m-qydts6* is moving with constant acceleration. Make a statement concerning its motion with respect to time6do*,e at so 4tny9,msqdo-0o.

  Can an object have increasing speed while its acceleratox q .. sg0lu,ns(5 ;yk)dgycaion is decreasing? Support your answer with an examplay qygcugn, kxo(d )s0s.;5. le.

  Suppose a can, after an initial kick, mon6p)+xwey/2 ik qm+pi8l6 dthves up along a smooth hill of ice. Make a statement conce+i2n/w +p mildpxe hk)q66y8trning its acceleration.

  Under what condition is average velocity equal to ykak,kb xu uapey/ b9 u,227h jnt2) gfdkn0,4the average of the object's initial and final velo 7b/,uud eknxnh t92y42)jau,kb a,0 pkfy2kgcity?

  Objects A and B both s 7020lzunbbc+r3vlbh x.k5 mgtart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the flvknxb5m u c2blb7 g0.3r+ 0hzinal speed of object A compared to that of object B?

  Objects A and B both start from rest. T8mxt(e3n(t8zg ff gn/jn5 b z;hey both accelerate at the same rate. However,g5z3(n t(fnfbmtnx/zg 8j;8e object A 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 and falls in the absence of frictio*h x*nyig( li-n, which of the following is true concerning its mot-in*l*(iy hx gion?

  When an object is released from m sc7 )1cy vu(3sgg:g96pvh j(wuw;zdrest and falls in the absence of friction, which o6sg3v9g(hguwyj mz ; uw7pcc s)(:1d vf the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statemenm/ja pzae;b6rwo,+ a 8t about the velocity and the acceleration when the ball reaches the highest pmrojepw, /8za; a6ba+ oint.

  Suppose a ball is throw.ao(ss1o.sn09-w g nav+onlgn straight up. What is its acceleration just before it reachess 1oa wnsg olnsg09ao(.v n+-. its highest point?

  Suppose a ball is thrown straight .ql8j,ryxrv30 )qu.qf 8q knqup, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the vrrfvyql8un0 ,8j)q.q 3qxkq . elocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height,pn0 t*3wwtu0og) pgx+ then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball in+w03*g 0) xtpugt pows coming down.

  Suppose a ball is thrown downward in the absence of air resistan, w o+rn xllswl-g6iqkw(v 9:2ce. Make a statement con: -lwkx gs2rw q+9wv,l lno(6icerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wha7mqr5y*fv/ e ufm2b/ot is her acceleration when she she reaches terminal vel* o/byfr5m/mv uf72q eocity?

  A ball is thrown vertically upward with a speed v. An identical secondfmc. e-5b3 gyraw:vuo0r2/ahzd*s3 k ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of th*-c0 g:fk5a orwe/2. 3b vmu srh3ydaze 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 lakb22mlxb . zf*ter, ball B is dropped from the same building. As time progresses, th*2mk2z .lfxb be distance between them

  Ball A is dropped from the top of a building. One second later, ball B is dro khi9c14mw3nr pped m34rk cin1 w9hfrom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buildiktm1 vx e*mrj r)qc4,)k,zfg*b r9m8 lng. One is thrown up, and the o m1m, el4vt* c j)gr rkz,xrqbkf98*m)ther is thrown 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 building. A second brick is thrown stra8 k06xxswk *49ru+o rogl xh,iight down from the same builx uk 8or+x ,wo9 gk4xrihs0*6lding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constaniivbo *-ouan4+xm1ek5zl q0. t non-zero velocity in the +x axis. The position versus time graph1ibuq+lv xz4maio o . 0e*k-n5 of this object is

  An object is moving with constant non-zev mrt1 i56bfv)ro acceleration in the +x axis. The position versus time graph of this omv16vbi rf5)t bject is

  An object is moving with constantd 62zte wm 6/ow3vx7w ui/28zsvk0 jt;e;ppkt non-zero velocity in the +x axis. The velocity versus time grap6; 6v2se7tk 0/v; jpx2 u3zzp/twkt8i o dmwweh of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The,q(xec8 acdihimm z5j..bbd qw5 2l4) veloci2 b)di mhcxq lemq(4aw .j.z5b8di5c, ty versus time graph of this object is

  The slope of a position versus time grapht 97 aj(q4pvko )md/v 9tcro4x gives

  The slope of a velocity versus time graphcuz98 3pvk ejsyo1e,- gives

  The area under a curve in an acceleration versus tim,huwn -: (gppx qrt-)ce graph gives

  The area under a curve in a velocity versus time graph gives40r ecf6p jo ;jy pieqwq16(s(

  If the position versus time grevpvs1v/:7rt0,fh ok aph of an object is a horizontal line, the object ihevkp0ot 1 ,vvs/:fr7s

  If the position versus time graph of an object is a ve qgm; /7lmnu*am6 qv-a/rm3 lsrtical line, the object isu-sva 3mal/mmr*nq/m;q 6g7 l

  If the velocity versush6vz 5bncg(kj(fud:dc, ; wn , time graph of an object is a horizontal line, the object iskc ,hvdnd(, 6znju:5 w (;fcgb

  If the velocity versus time graph of an object is a straight line makio9xnr 1e hjf+*-q 8xying an angle of 30 degrees with the time e*+8 1y9 qxjnir xo-fhaxis, the object is

  An object moves 15.0 m north and then 11.0 m south. F ns+q:3u2e5c kvk5e hbind both the distance traveled and the mah52kbc:n3 equv5 +kse gnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will itbb6, 1low.zk t 3 jrkkf;da1l) take to move 12 km upstream in a river flowing 6.0 rz ka 113ofk,ld; k.)bjlwtb6 km/h?

  55 mi/h is how many ml-viy7(ne+d/d nrea09i/, lte, tm cd/s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km 9 vl dfjdh o(/8sl*n7iin 5.15 h?

  A runner ran the marathon (approximately 42.0 km) kg 0nvo a4ed*wr3z7w4in 2 hours and 57 min. What is the aver*w3 g r4 eoan4k7zvw0dage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to dc)iz iu+o r4mv pc)7iws2:/ a 4rfm-b1uk:tmtravel 400 km?

  A ly (light year) is the distance that light travels in one year. Thpfen3:mutx:) 2;l ty se speed of lig:x tu2sftl):nm3; eypht 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 straight road and you lgo*h(.md sw0 ty r-.zawme /4aook to the side for 4.0 s, how far domzeoy .aswd-4/* w ag.0hm(tr you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your a3dqfzl0;0aml verage 0 3faml0qz l;dvelocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0rto lch zl5m8z82-; fo km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was8 mho-ltz 58rfc2 oz;l the bear's average speed?

  A polar bear starts at the North Pole. It travel3 7oydrg ou4p*s 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 4y uodr p*7og3average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 milxjmw.jhcq /* 0es. It then smw.*x0qj/hj c tarts to snow 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 160 km at 100 km/h. What is the averawluh0 : zhawds8bgt5c) b*a/. ge speed of thdahs.:wwt8u) l5ab z c*h/g0 be motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0qzizd et:.mn fc0;5 b./wb: fg h at 100 km/h. What is her aver5 qz: ci.0gdbwzfetn m:. ;/fbage speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and th ltod: ;ravw;3en at 250 mi/h north for 750 lv t; ro:;w3damiles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person wh v;w64gx tt:q x4h)wlmo 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, int6l4w ):t xh4qwgx;vm order that the team A runner not lose the race?

  A car decelerates uniformly and comes tjcv8j2 s6p i; zx:vsqi.zhl4b(,, leto a stop after 14 s. The car's average velocity during deceleration was 64 km/h. What was the62;hz qvi4e( v,,8si x:stjll z cbpj. car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate t.4kn8md ;,x wd x:xtxof t:;4,xxxdx8mn twd. k $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rat mvqbupx7 ww5u; 5szi5i/en* m4* ()syix7n fwe 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 an6 d*gt4 dnuj /v/f3gnnd 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 se crd3e+69s 6 qmsi2vn -ne(facceleration o6 -s(qc2 eednn3msivfr+ e6 s9f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.5 m/s experiences a constant accelerat7jb/zzxqcf*09g 4y x bion of/q 4 9x*yz cbjx7b0gzf $2.0 \; m/s^2$. What is the cart's displacement during the first 5.0 s of its motion?

  A bullet moving horizontally to the right (+x jzr(-7u6wuq wdirection) with a speed of 411 m/s strikes a sandbag and penetrauwuz6j( q7r-w tes a distance of 74.18 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launcbmdbre vw *597hed from 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 acceleration is constanb *rved b5wm79t, what is the length of the catapult?

  A car starting from rest moves with constant acceleration of (ipimoy-) a8d $2.0 \; m/s^2$ 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 ave5 0s+yqy ptiv*56ur rgrage acc6 i sqty5 up+yg05rvr*eleration?

  An object starts from rest and undergoes uniform acceleration.w --tk 8:l;ny11 r;rozqzcaxt During the first second it tklw-8:;tar1t r oxq1;zn- zycravels 3.0 m. How far will it travel during the third second?

  An object is moving in a stra/i/.62 cmpig hf mt4bright line with constant acceleration. Initially it is traveling at 16 m/s. Three sec/pb/ r6fgimit24 . hmconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly d1r 3w(koe gl,qyw9k +zf(a+ tat $3.0 \; m/s^2$. 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 decele8 cj-zbx(kp9jrate 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 at the m jo9-tbb hs(j-w*z8ointersection starts ahead with a const-8bz b o t9*wo(hjsjm-ant 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 plan2u orvie)u fa-l)nro2p +zu0 4et X where the acceleration due to gravir0inp)uel2zou+) ro a v2f4 -uty 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 whj qz4(e;ni2 loere the acceleration due toez 2i(l4q;o jn 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 speed of 15 m/s on the surface of planet X whe qh)tq 9g+fs)fy 7l.uzre +7fsqy)htu.l f gqz)9the 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 on the surfacekx hm. e,dliflb/ lzr; am54d.aq*+: m of planet X where the alhm4lqi*,/dx+.mazr a: l.bkdef ; m5cceleration 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 holds9:+wl ;qx5t oeu sge1k a ruler between your fingers and releases it without warning, howlqk ; +x t:w1uo5egs9e far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at 4 tqx 9b 1+,onpgncghyke-w01 a velocity of 19.6 m/s. What is its velocity after 3.00 nq,-ngep b x0 ot+cghy491 1wks?

  A bullet shot straight up returns to its starting point in 20 s. What is the in iejd.6d crd -,u4-bgcitial speed of th -4gd.r dc bjc,idu-6ee bullet?

  A ball is thrown straight up with a speed of 36.0 mqhvocd ioz*de4+i.7. /s. How long does it take to retud +vieo*d7.q.z4 io hcrn to its starting point?

  A ball is thrown downward from the top of a building with an initial speed of 4t ynzctz3d 6-/)ps iq15 m/s. It strikes the ground aftent/zsit )p c qd64z-3yr 3.1 s. How high is the building?

  A ball is thrown straight up .)w sz/: kyupq-+t0r tivheq6 with a speed of 30 m/s. (only fill in numerical valu ky/ z0t)qp w e-:rqshuv6+it.e 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 in vrxn vp-479kkto the air with a speed of 27.1 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity:oo 88 icfk6r3aab4ok at t = 1.0 s?

  In Fig. below, what iskq: f878cnn.5mjusimn+h( wp the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t mo9* 5 nbpchh1= 4.0 s?

  In Fig. below, what is 7 /ios*ad/ .bq2yqo6a6unent the velocity at t = 5.5 s?

  In Fig. below, what is the average veph 62+wldfvx- locity from 0 to 4.0 s?

  In Fig. below, what by16vym *s 4m,2opq gxis the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratio(+gp5 zc5mkden at 1.0 s?

  In Fig. below, what is npy k*g, g::9bm2 ff.5goy phathe acceleration at 3.0 s?

  In Fig. below, what is the averagaa w+ bybm)4;a:xi:v spng +,ye acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleratio.tzcn -:qtq0vn from 0 to 8.0 s?

  In Fig. below, what is the displacement from,r x kzw(pis06 0 to 8.0 s?

Does a car speedometer measure speed,(* rfvsiyj*;vdf4/d,akcuq2 ts2 ba 1 velocity? {speed|velocity}

  An object can have a varyi9o x lz3dgji8*ng speed if its velocity is constant.

  The velocity of an object can be negative when its ao( .8r)*:k efwp,jbgsdgzss9 cceleration is positive.

  If one object has a greater speed than a second object, the first mus:h v( 7aorx +nhylm*f+b3nvc:t have a greater av* 7m+focxlany3r: (nv :bh+h cceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a- wun7ar( mp-s 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 acceleration decreacj/vb 2bw.dizsl/5bf :d.im)ses.

  A baseball player hits a f *0e pypir humeb5 +i6(9vz*mh6n)rkeoul ball straight up into the air. It leaves the bat wi)zivmhr+p uiep r 66 *eb(yh95 *0ekmnth 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 its accelere-ly5 qmlv;5 u1i1a+5jzhvsvation, how does it change if air a;i +1v 1-zlm5 ejhly5uqv5svfriction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, h vy/hi0ya43dg ow does iti3/ v0d4yghay change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positiovvx3un +6l lf-(ivh 2un vfvux36 hn(v2-l lu+iwith 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 velocity and n zk9vl / , 3sceuzixydyzk:j 2c:),v.uonzero acceleration at the same time.

  An object can have nonzero velocity annm b h1z; mr w)tql+58wm3fc5ld zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no b-s w6kn8q6alj39 tpq j7,wj mstops along the way has zero accele lanj3tbsp,mw6q-k8 qj9 j w76ration all the time.

  A rolling ball moves yzb: 37(w 2j8 smbdpzhfrom $x_1=3.3 \mathrm{~cm}$ to $x_2=-4.5 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.8 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile (9tv-x xs 3jao 9-buoz($1 \; mile = 1609 \; m$) track in a total time of 7.3 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 101 m ju 3a dy irsb05wqb w,7:eo(j;:t+lpeaway in 10.7 s. Itjerp: :3u w j; ole 5t7yba+(sd0wiqb, then turns abruptly and gallops halfway back in 4.8 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 from0/tupxsl939 bx o zs,t $10 \; m/s$ to $25 \; m/s$ 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 de d8y 57wtcihq i0 2w8x4mye7$19 \; m/s$ to rest in a distance of 71 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reax9hppy s-1g y3m vs,)fch a speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of tp* pw5cr5a;m oszfo; *he blocks to essentially top speed about*mpo w5*f5sa;o;z rpc $11.0 \; m/s$ in the first 14.3 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 speed ofj4w2 ne: dhnz. $20 \; m/s$ to rest in 5.38 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a3q) 4w, e)x blg kvgas:*lnsm5 car leaves skid marks 92 m long on the highway. Assuming a decel swvelgmbxqn)l: 53 as4k *g,)eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck u99e+zn xrg d1uk8(fv 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 thae+ k lle4k68gn97(e+br ecui ln 30.0 min. After exactly 27.0e+ i8ne76+ (lcleu4gebr k9kl min, there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$