Suppose that an objepxp r9c+a/xt 4z9x t-jct travels from one point in space to another. Make a comparison between the displacement and the dista-x/x9c4zja9x t+p ptr nce traveled.

  When is the average velocity of an object equal to the instantaneous veloa4zwj,5gjz*h city?

  A new car manufacturer advertises that their car can go "from zero vz0hkzikf2y m*bf9 57 to sixty in 8 s". hzkk20f vyb5zimf9*7 This is a description of

  An object moving in the +x axis experiences an acc5rpr7g-d7bpl :b k*wzk/6)ehw d;hhpeleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down;m fbod;hlf4gux48, c as it approaches a traffic light. Make a statement concerning its ac ml;4c;84fhb f, uxogdceleration.

  Suppose that a car traveling to the West (-x direction) begins l,w)ier b.p+hkwl)/sto slow down as it approaches a+bw ))repw/, h.kls li traffic light. Make a statement concerning its acceleration.

  Suppose that an object is movingm5rth rs+p)8)er 8kov with a constant velocity. Make a statement conceos8rvt8rp+5 ekh )rm )rning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is ve ef/f ).8aeazvbd 6 sk)hw49zero? Suppo)e6zaehkv8f/.) b asw9 v4de frt your answer with an example.

  Can an object's velocity change direction when its acceleration is constantg ilnay/8/n ogf8fs7 : ,p,lnq? Support sn8 lflo8/g, a7 ny: iqp/fn,gyour answer with an example.

  Suppose that an object is moving with constant acce*0a6qijddzff s1uvm.a7h/i-e j(i n3. mo*m bleration. Make a statement concerning its motion with respect to time- bi.ao6dnj*dei*0 mh7(qim ./ amj3f su v1fz.

  Can an object have increasing speed r4jkew52 9-wtd c+ 9ynkixfk+ while its acceleration is decreasing? Support your answej2xe 94fr5 c9w-wti dkkny++kr with an example.

  Suppose a can, after an initiansi2f 1:q+o4; 8 kuddr;cpewvl kick, moves up along a smooth hill of ice. Make a statemene;+d kprn8oi:scuwq241 vf d ;t concerning its acceleration.

  Under what condition is avergk clw :y9,w;v u27ianage velocity equal to the average of the object's initial and final velocvy;w:2l,g na9k7w u icity?

  Objects A and B both start at rest. They both accelerate at the w0k jf.oxw yftq.+9t6same rate. However, object A accelerates for twice thtx 9.w.yjkfo 6 fw+t0qe time as object 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 accelx.)meram a51xwws76ru:+f u j erate at the same rate. However, object A accelerates for twice the time as object B. What is the distance 7m :rjsrm+6ux51.wxufa) ewa traveled by object A compared to that of object B?

  When an object is released from rest qy7y, sri 5mt*qljxr5 ;v 3i/gand falls in the absence of friction, which of the following issr, 5qxy/*3imilvjt y 57r ;qg true concerning its motion?

  When an object is released from rest and fjx)lvo6i pa 5m pv0ba0t:z,e;alls in the absence of friction, which of the following is l)v x im,5006v;p:a tpa boezjtrue concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity anlzfu7h7n 2wkl4 wyl2 3d the acceleration when the ball reaches the highest poilwkflh7 34nu 22w7zy lnt.

  Suppose a ball is thrqdid1y 5m9 r1uown straight up. What is its acceleration just before it reaches itsdr9u1mq15diy highest point?

  Suppose a ball is thrown straight up, reaches a maximumlz(c a)k+ziwi uo/g /; height, then falls to its initial height. Make a stat/cw(zlgaii ;+) ouz /kement 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 i(n *f 3fq m0wuz7arxr48/mzyy nitial height. Make a statement about the direction of the velocity and acceleration as the/y7unzf(*mm38 0wxrf y4qrza ball is coming down.

  Suppose a ball is thrown downward in the absexo*gg e3, f dnu5z11f8unn.wznce of air resistance. Make a statement conc nnfex.nwg1o5 *,zfuu3z81 gd erning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratiox ijzr775v11pygwbq .n when she she reaches terminal velocit7p.w1qyx 1iv7jb r 5gzy?

  A ball is thrown vertically upward with a speed v. An idesky:k6n 7- 7hawmakk3 ntical second 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 the second b:snyh7-6 kak3 mw7kakall go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ballitye j8h; y+,w;r gxiy0-hb5n B is dropped from the same building. As time progresses, the dist g;bieyr8tyh -hwx;5ni0y j,+ance between them

  Ball A is dropped from the top of a building. One secoft ozj ad),bn5li 3)5indcauy*l g )kku.+)p ;nd later, ball B is dropped from the same building. As time progresses, the diffez not;di)kb5lal ) c*+u)u a,jp3dyg). inf5k rence in their speeds

  Two objects are thrownz nv+y2cl22x/nwse.5 u- zmxd from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their s25 .+nuwxez ymsz2c d 2xnvl-/peeds when they hit the street?

  A brick is dropped from the top oj*, /wwtm::fp - 55bmbujp*kt ibk+ ldf a building. A second brick is thrown straight down from the same building. They are released at the same time. Nk p:tdwi:+b5pkmu-w ,j 5 *tlbj*/b mfeglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positiovug;awee5v* m5+q q h ;1i0bgjn versus tim0eme qv *+a5;igh5w;q vg1buje graph of this object is

  An object is moving with constant non-zero accelera+zw p t-8pwze86 mz ljn58.toltion in the +x axis. The position versus time graph of this object6own8 8tpze8l+.zpt lm-z j 5w is

  An object is moving ts5u qa05 i*cse;9 tn vmdf 40;gas*oiwith constant non-zero velocity in the +x axis. The velocity versus time e o0*sf*au5; i 54nm0 cts9g;i tavqdsgraph of this object is

  An object is moving witc0e itt *dqthl4xii/.*47iwxt6b k 3vh constant non-zero acceleration in the +x axis. The velocity versus time graph oft4etdl3iq0**kiwt7hv6 .xibt/ c4 x i this object is

  The slope of a position u:8dj (bo6q jfy4d:(4rq z7cjmpgj 3iversus time graph gives

  The slope of a velocity versus time graph gives1 a0xouxsqa(rrc0 2f ,

  The area under a curve in an acceleration versus time grajdr5 -b,uht4ldx/,uiph gives

  The area under a curvq w-mjs; */kweex7me rz8325b5fw rdte in a velocity versus time graph gives

  If the position versus time graph of an object is a hor/u95gd.k kjnfw :7im/a8qvyoizontal line, the object isqik9 kw:y5/7.najm/8fvd guo

  If the position versus time graph of an object is l8uq) awj 50aza vertical line, the object is8 aq0al)uz5 jw

  If the velocity versus time graph of an object is a horizontal line, the u:.r q/ kei 9p:oautf7an18iiobject is/fn: 7ue.:ku iqiari8 9t1oa p

  If the velocity versus time graph of an object is a straight l4 kek9s4c5ux( :y0cf1axj h ykine making an angle of 30 degrees with the time axis, the object kkjcshyx0 5 : ey (ckua1f4x49is

  An object moves 15.0 m north and then 11.0 m south. Find bmm;9tn0y( a+ bz( loq)n6 vdmhoth the distance traveled and the magnitude of the displacemen 9q6)dl;+ymmb n0hzoa(tv n(mt vector.

  A boat can move at 30 km/h in still water. How long will it take to mo, e;*y;tembxg6ur;plve 12 km upstream in a river flowing 6.0 km/h?u bex;6yl,gp r* m;;te

  55 mi/h is how many m/s? (1 mi = 1609 m)-9mt 7p va(izs

  What must be your av;* vc ;qkakax1erage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hourrdl49a1yz. 6sleuaa00 wb fj* s and 57 min. What is the average speed of thewlajazf .09u1b 640dar sl *ye runner in m/s?

  A car travels 90 km/h. How long does it9 u*vzg*h) )tmyyi sr, take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one ry)ktx1 8 mf5w(m5d)b7oz2ivzrhku:year. The speed of light is r58xfit(v5h) z1d 2k ywkoz7 r)ummb:$3.00 \times 10^8 \; m/s$. 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 temqb e,4 zm64ihe side for 4.0 mqmiz , 44be6es, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor ti)c4aj: d(d korack (400 m), in 100 s, your average veloci dkc j:ado(i4)ty is

  A polar bear starts atk/q,-pszzz3jww tzp z1:c::yll1jx 6 the North Pole. 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 w/pzw zpw 1z: l1: -ljctz3j6k,zx s:yqas the bear's average speed?

  A polar bear starts at the North Pole. It traveliy n/ x+djd)-a/hst 0 al4st6ms 1.0 km south, then 1.0 km east, th+at jdslxnm /6s h-/ dy)t0a4ien 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 average velocity?

  You are driving home on a weekend from school at 55 mi/* whx*4hex:i ph for 110 miles. It then starts to snow and you slow to x: e*w4* xhpih35 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 ug5o5)hkh7 fck nr1:gkm at 100 km/h. What is the average speekc5: h7o g5r1k uf)nhgd of the motorist for this trip?

  A motorist travels for 3.0 h ati7 w8n yqak7g *+3clqj 80 km/h and 2.0 h at 100 km/h. What is her average speed for g3 q a7qw8*ylic+n7kj the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h norx,7pm(z gv0u :qbey:7)z aukxnn y3j 3th for 750 miles. What is thy7bkavzj zn3:ux)n, ( gpm xy 307:qeue average speed for the trip?

  In a 400-m relay race the anchorman (the persoeuw,,ivm;d : y xxfq ;s-gesb.sm m1o8d/;bg 6n 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 idqbm, xm sx,g 1 osyde; .w-uem 8vbg/:;f;s6starts 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 st9byeq ukhj4/ )op after 11 s. The car's average velocity during deceleration was 69 km/h. What kh yq)e4jb/ u9was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the avfima os61 /-overage rate of 1ams -fiovo 6/$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the r /n,ixum,me,d/wyzn9am9) gng 3 o*osate 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 and ac79cytu4exlr .ngj.( i tt71jvcelerates 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 const e 6pn;s6gimk gb:.k.yant acceleration of ypne.mk i;k:gg6.6b s$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initialwa-l wfh.z28sfnd-to 6jh k r -sz*.:d 7)gluy velocity of 7.6 m/s experiences a constant acceleration o6:gz*-8 fzs.-- w tnjlwo. laydhh urd)7k 2sff $2.8 \; m/s^2$. What is the cart's displacement during the first 7.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed op :re..fg//uvm*l4pe xtly 7h f 361 m/s sg *fe4rh./ ly :mv7t./plexputrikes a sandbag and penetrates a distance of 65.54 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 car h.idyuqoze8p64gadvh) :lyk3 b d6 )*rier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acce.dd66y qd8 o4)bhau3)p: zg i*yklv heleration is constant, what is the length of the catapult?

  A car starting from rest moves with constantsme3c ;p-.jah;i bcj 2o6p5n u 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 a ghpixo,7/ )yhverage acce,po/i)gxy7 hh leration?

  An object starts from rest and undergoes uniform acceleration. ,a) v(;tsadpmDuring the first ,ts; a(va)mdpsecond it travels 3.1 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initially i uu s5m.7kjv/i3r dqn1t is traveling at 16 m/s. Threenism 7 3/rju5ukdq1.v seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest g u ym3(sz;9gnnj7 v9hand accelerates 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 tiresaixdj4 hzh7m29( n+xv on a dry road 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 n.el n.xa i*-qthat has been waiting at the intersection startan l xn.q*.ie-s 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 upward with a speed of 12 m/s on the surface of planet X q ,vg0hjtyzs115 qm+xwhere the acceleration due to hgm t, s+zq11v5jqyx0gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of rztkj-l s9 /;v;url9c12 m/s on the surface of planet X where the acceleration due to grazsr;-k;llc t9 9r/uvj vity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwp1 m .h0(ttgw+jim k/kard with a speed of 15 m/s on the surface of planet X where the accelerationmtkm0 i.wgpj1 /(tk+h 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/a -ydy 6 h2gtp42iw-vds on the surface of planet X where the acceleration due to gra26wyi y v2gddh-- 4aptvity 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 frh+dm6q z7 g wftb/6ye:iend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall befor67 q:gzf/dw+e6 bmhy te you catch it?

  A ball is thrown upwarew mp afoq62,gjw8-3n d at a velocity of 19.6 m/s. What is its velocity after 3.0eq gp-w,ow 6jf3am 28n0 s?

  A bullet shot straight up retds en n1i4l)ch*,jr+eurns to its starting point in 11 s. What is the initial speed of n hise)*1j enrc+l4d,the bullet?

  A ball is thrown straight up with a dth;n-v6g) 2 a swxc1y.l iu4hspeed of 36.0 m/s. How long does it take to return to its stahagl. ) -;yis46n1dx 2tvw uhcrting point?

  A ball is thrown downward from the top of a building with dqq+eaud35l *j2;wu1m4bpk h an initial speed of 20 m/s. It strike+wk15u e*am;4q jd2h 3lqbupd s the ground after 7.4 s. How high is the building?

  A ball is thrown straight u3 h7rsplco1k mb3 a0,9p*c c jr26zfpop with a speed of 30 m/s. (only fill in numerical value in k9cc7c3pjp,bsoa1fr m2oz p*h r3l06 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 the air with a spee5ni*1lbf 0ljr1par42w)eua w d of 33.5 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocicz0viuq u1 vs2f/l*/)whi6ano-xoylc 4 6p(g ty at t = 1.0 s?

  In Fig. below, what is th2y:-o7 l-3*kvc+ glmmq *c zqocz4yhme velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.3vs.vr 9buiq *;n z+yf0 s?

  In Fig. below, what is the velocity at t = 5.5 s?vh2a+ k qqj35g

  In Fig. below, what is t8ljcqr l909wij 7dn:phe average velocity from 0 to 4.0 s?

  In Fig. below, what is th59z 1pql xt /.r2- vtfvss3wkoe average velocity from 0 to 6.0 s?

  In Fig. below, what is the aca4hq,z/a. i yw cvw 2of)4lkb,celeration at 1.0 s?

  In Fig. below, what 5j1blvbza l3rjf(3w17bp ,u+sq. v gnis the acceleration at 3.0 s?

  In Fig. below, what is thm*9q y, vxkvrb v icl)16f7z1e5c 8ipde average acceleration from 0 to 5.0 s?

  In Fig. below, what is the avel*esvl6 6mjz(s ws(hu 20nxq 4rage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 tjz8o7e;,c; :jmvadeb o 8.0 s?

Does a car speedometer measure spee 6jwpg j 0njefn;3l-/qd, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is coa( fs9cvrrtn xyz8;10wb12e2:p u vtnnstant.

  The velocity of an object can be negative when its accelera -tang fp2(6hxtion is positive.

  If one object has a greater speed than a second object, the first mus+4ogeey 6aryd5)ed - wt have a gre-ea e+ywr6 d4o g)d5yeater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling wo,r;: idw9guaith 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 acceleration decreoo4pk/usa g)j:7w1sevq, c2d ;qxt/lases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat3r3 m2/ gvmfi5s wb 10tylc281pelksh with a speed kgvf12 yb0e3 rlt s2 853whi/1p clmmsof $120 \; km/h$. 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 ac3mpwj wpx+.x0celeration, how dox.p w+j0w pmx3es it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, qu3kubn8mc5.xqt 6x zf9 (p 3khow does it change if aik3(u8p u6 k3.nxqmcbqtz9 x5fr friction CAN NOT be ignored?

  An object that is thrown vertically upward will retb er4r5xmexfo.p 8w 9p4i4 r6xurn to its original position with the same speed as it had initially if air resistax46 5peipf9orxr rbw4mx48 .e nce is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velozum4 d)biq clky u-173city and nonzero acceleration at the same time.

  An object can have nonzero velocity8+ yyd94zly/kt e3ew4tl 1d n,vyyr6l and zero acceleration at the same time.

  An elevator moving fromh;;cvhjc6ps pfc72 -a the second floor to the fifth floor making no stops along the way has zeroh 2- c6a;sv;fpj 7pchc acceleration all the time.

  A rolling ball moves 24xbg54(j r5wmdqdcn from $x_1=1.6 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a.kmfl8m tjx08b qv-j 6 quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.0 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, moe83.p qm5z2 bmmsstt6ving 88 m away in 9.8 s. It then turns abruptms5btepm q3m z862.stly and gallops halfway back in 4.7 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 frkb/x k/l; +ipkv 0tf7tom $12 \; m/s$ to $24 \; m/s$ 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 frommzds qg)-8 5uq)5 vefi:dhx q6 $21 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re3/ * kn 8sbadfbdn+:cqp; q+krach a speed of $33 \; m/s$ 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 can burst out of the blocks to95wrhx21 qk fc essentially top speed about 5hk9xf 2w 1crq$11.3 \; m/s$ in the first 14.8 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 frhn1jng 1 +f,xes x mh7f0e9m-tom a speed of $19 \; m/s$ to rest in 5.82 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the highway. ,-o+l wsdbfnku+) g4h Assuming a decele ,nk+ g-o)udw4hbs+f lration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go5on7wha: av4fyo+k y /ing $25 \; m/s$ 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).    $m$