Suppose that an object travels from one point in spa,u d71 f5q cq8-ywxhdyny,* lbce to another. Make a comparison between the displacemenqdyl x wn*1qyu,5cb,- hyf 7d8t and the distance traveled.

  When is the average velocity of an object equal to theg8p)).rlzy h e instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sdomy d kvk;6rsks*e 4 d+8;b5cixty in 8 s"y +5cd8*dm;k dobe 6;4s vrskk. This is a description of

  An object moving in the +x axiq:k hcq*x s ;/y mjxdju6 f0p7z;e6ld5s experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dked3 ii/g nu-4irection) begins to slow down as it approaches a traffic light. Make a statement concku4gei3 n/ i-derning its acceleration.

  Suppose that a car traveling to the West (-x direction) oid5vjyoz ()/begins to slow down as it approaches a traffic light. Make a statement concerning its acceleraty/)5 vzd o(oijion.

  Suppose that an object is moving with a constant velocity. Make7 5pg*8vudrg-ab o oj0 a statement conced8 r g7gp 5v0b*au-joorning its acceleration.

  If the velocity of an o37ehj-0d g xfn/;t rbqbject is zero, does it mean that the acceleration is zero? Suppo7-t3bhxrn; 0 /gqj efdrt your answer with an example.

  Can an object's velocity change direction when its acceleration is constant? Suv)6aly-h qp h4pport your an-6hla)vp h4q yswer with an example.

  Suppose that an object is moving with constant acceleration. Make a statement+m3roorz5bkt 12x +pr concerning its motion with r rx31orz2k+pro5b+ tmespect to time.

  Can an object have increasing speed while its acceler-8vjyff byn a8+) yn:ij2.u umation is decreasing? Support your answer with an exy8 b)8f:jyav. -uufjy+2 minn ample.

  Suppose a can, after annewpsy/2*tz hzl3 g4e k 9rf./ initial kick, moves up along a smooth hill of ice. Make a statement concerning its acceleratiole gnf*4y 2wkp./z zrst9/ eh3n.

  Under what condition is average velocity equal to the average myq/;90uukph 9ldii* of the object's init 0qdhk i9pumy9u*il/;ial and final velocity?

  Objects A and B both startqo )unvt ou7+5 at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object v7 +to uuno5)qB?

  Objects A and B both start from rest. They both accelerate ar ihq+ wk.q(b zi4f1/2xgjrr e70eh7qt the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objebkjf1hqeqi( 2ewz7 rh7irx +qg/04.r ct A compared to that of object B?

  When an object is release0tlotrhb+; q .d from rest and falls in the absence of friction, which of the following is true ol r;0 hb+tq.tconcerning its motion?

  When an object is released; ,-4tlgzp dgx from rest and falls in the absence of friction, which of the following is true concerning its lzpx, g;t4g- dmotion?

  Suppose a ball is thrown straight up. Make a statement about the velocity an7 z4 scsotb1 a75ga 7tmq;jce2d the2smt54zq so71 ;j7be gaa7cc t acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelerj u *efq 0q 5pqo:ycxw1wml8 zwv4-h11ation just before it reaches its highest poi18 :1yzvqjpew-u4w mxlohcw f0qq5* 1 nt?

  Suppose a ball is thrown straight up, reaches a maximum height, then f4mfrt x*q 5s1dalls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goi5t1xfq ds*4r mng up.

  A ball is thrown straight up, reachestw1h ewm/* z+ xgd3t6g a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and m3g dwz *he16twxgt +/acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air rese2s oxdtecr+4x jrl .xia6g.jj( v4/ /istance. Make a statement concerning its acceadj(jcex.v4rg /xlr 24. i jtx/os6+eleration.

  Suppose a skydiver jumps from b2uf q7).sho8lv8a ilah:e8va high-flying plane. What is her acceleration when she she reaches terminal velhq7ls.eh iv8) b:8 uf2aov8alocity?

  A ball is thrown vertically upward with a speed v. An idejxnmc.kv*:: oq3recq k)ur 83ntical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball t) .v8ke:q:r*nro k xq jc3cu3mo that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from tcajkk2:-sp wi1 z +j7ehe top of a building. One second later, ball B is dropped from the same building. As time progre72pcak isj-1:ejk +z wsses, the distance between them

  Ball A is dropped from the top of a buildt iou5n1bz/o c8-bi8v ing. One second later, ball B is dropped from the same building. As time progresses, the difference in their speedzoiv-ub inotc881b/ 5 s

  Two objects are thrown from the top of a tall building. One is thrown up, and 5tn sfjrs +w/8kyhb y6f8z; /jthe other is thrown down, both with the same initial speed. What are theyjj8tn+hr8w6/ zb f/;ss5 fky ir speeds when they hit the street?

  A brick is dropped from the top of fenn23z7)kwm a building. A second brick is thrown straight dn) ek27mnfz w3own from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant afmw,6s5 4hsu non-zero velocity in the +x axis. The position versus t5sau shwfm 64,ime graph of this object is

  An object is moving with constant non-zero accel4m kur2;9uxsppih7 wxwb8h3s * g. v:deration in the +x axis. The position ve3 8 4xpwu ssg2rb9;*dpvkwm 7:hhui. xrsus time graph of this object is

  An object is moving wi 4mr(3rf-69 z1fhc /ubmvw,pn 8tszhfth constant non-zero velocity in the +x axis. The velocity versus bv6 ftu4mmhrzc-8(nf zh 1p/f9, wr s3time graph of this object is

  An object is moving with constant non-zero accele r 9a8ilj. cmu3cvs+s9ration in the +x axis. The velocity versus time graph of this ma+lsc9j8svu .r3 ci 9object is

  The slope of a positiokp1ho 2ba1vofzhj m( .)93av i3*gmdpn versus time graph gives

  The slope of a velocity versus time graph gives6p1ruv6c : g .:1hb9jsc czedr

  The area under a cur) nrzxn8.dz0)rkx y5bve in an acceleration versus time graph gives

  The area under a curve in a velocity vers p28z5;lap uzkus time graph gives

  If the position versus time graph of an object is a;jj,nq.m sy(u c1 aoq4 horizontal line, the object uj qn1c;j(o. ,sm4yaq is

  If the position versus time graph of an ndp g+4k7r/4zxcd5 1) sft ju;fkrie9 object is a vertical line, the object iszrpd etc f5/7x4gi;jk)n 1r+9dfk u4s

  If the velocity versus time graph of an object is a horizontal line, the objec8o3v0; hhre zf4dbzb6(b r,tn t ,hb 3r e(n6vz;bz 08rtbdo4 hfis

  If the velocity versus time graph of an object is a strai6jzscl 3rd c3m s9s8mr6vtm33 ght line making an angle of 30 degrees with the time axis, the object36rljmmr3c3svt s3md 698 cz s is

  An object moves 15.0 m north and then 11.0 m south. d 2po i5difhs+hut ;2x+o5zdcdv 0 +p5Find both the distance traveled and the magnitude of the displacemen5s+hit0o+d; 5 d5zdi2p2vf+ uh dc oxpt vector.

  A boat can move at 30 btqg z;bo/y9zi4+ e8 em3sc1 mkm/h in still water. How long will it take to move 12 km upstream in a river flowing 6.0 m9y4g/ o sz1qbctm3bee+; i8zkm/h?

  55 mi/h is how many g8fek76bhc 649hggkk m/s? (1 mi = 1609 m)

  What must be your average speed in order to travelvy.bs64ovrlu55j u( g 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whl8*b yxc*4cwc.3 kk7g etkb,f at is the average speed of t8,cc 3kbkex kw4. *7*ytg fblche runner in m/s?

  A car travels 90 km/h. How long does it take frznaq7w6b4q 7or it to travel 400 km?

  A ly (light year) is the distance t/ 8/akhhky9 buhat light travels in one year. The speed of lightk9k uyhh /ba8/ 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 kmkbjnwimv ;0ydusy -6(.mtoq: (,i.ta/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inatteijbyy(.kwsa, ;i u:dn6q v( - tm0om.tntive period?

  If you run a complete loop around an outdoor track (4w,h.rbu lxw9 tl/8h7r70qs xe00 m), in 100 s, your average qls7hrw tr.u xh0x8 9 ,we/lb7velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south,gk;-/epn yd 9i 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 average spe;/y i9e-kng pded?

  A polar bear starts at the North Pole. It travels 1.0 km south,u2r,q3gmc+/+.nnji it l .kew then 1.0 km east, then 1.0 km north, then 1.0 km west to rnl3+gcw +q . r,tiu2n./meijketurn 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 mile p..qcxzusse)xgvt k(s +(p+3wt,x bzy ,-zm(s. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown fz(zgzpmusw()vs,tcx(t b+.q xy ep,x 3sk.- + rom school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the avey6yj5eaw)f0j7ud1kp,rcs 9 0j t dwmrd/h/. erage s 7ceys p 9rd1rm jwk50)fwh.uy,a /e/6ddjt0 jpeed of the motorist for this trip?

  A motorist travels for 3e, cmwq.b; c nh25-yft.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed .;c 5t-bmwqy2ne hfc,for the trip?

  An airplane travels at 300 mi/h south for 2.00 h anp a3op3o-bge3 d then at 250 mi/h north for 750 miles. What is th bgo-pa 3o3p3ee average speed for the trip?

  In a 400-m relay race the ano kpmn1m38 oxn8 w,3rtchorman (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 t18,wno 3p8 mnr3xk omrunner starts 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 stop aft9qa/p.e,p8oev p lb;c4gou w3er 9 s. The car's average velocity during deceleration was 69 km/h. What was the cape9e4p/l.b ou ;8vpqa,wgc o3 r's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averag w;h7mm+w.fnr e rate of w .mw;hf rmn+7$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atb/r.m3z nzmp3 lbn.a, the rate 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 an-iipr n1z(x.g8vl2w ld 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 withfjt05h jg mnd .dn;0j7jp4xy, a constant acceleration ofh njdj 5fygt. d jxn07p4,0jm; $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.6 m/s experiences a constant accelerati/*f d/ md+mrggkkj dy8jo9/ ydzr(k40on of gm jr+ jgd 8km0 /*o9kkd4dyy(/r/dzf $3.1 \; m/s^2$. What is the cart's displacement during the first 6.1 s of its motion?

  A bullet moving horizontallh l yrf6s/hl b+atp0ef8u3* /cy to the right (+x direction) with a speed of 298 m/s strikes a sandbag and penetrates a distance of 80.18 cm. What is thea0luh fh+f *be/c8 /3 ptrs6yl average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane i2tqax:ikxm/*htr7 : f is c38ijm9d v+s launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s dc38:rx j2t :xi t* ifmak/mi9+svqh7at 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 .eyxs +/us vbef(6lh.bgtc7. rest moves 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 m/6-** w+c,p a h ,enxewkir 6u6ynzeckwcw2s.)s in a distance of 200 m. What is its average accelekzcne,wuc,he 6 .saky-2w6ewx w* p*c)n +i6r ration?

  An object starts from/.vq oply0ri3 rest and undergoes uniform acceleration. During the first second it travels 3.4 m. How far will it travel during the third sq3yv/.ip lor0 econd?

  An object is moving in a straight lio fx rv7-q7 8ogd1 --deqavl5gne with constant acceleration. Initially it is traveling at 16 m/s. Three secondv 7d 51aq-fed-rvx -ogl7go8qs later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acc3:ui3q;hz unucr .a8 uelerates 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 decelerate at aboutgzp gqj ln2slu7qu;f63t //+n $5.0 \; m/s^2$ 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 has9an: j9v8vdhf been waiting at the intersection starts aheaa9djv :nvfh89 d 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 th u((n w5f:1ttttb0cz fe surface of planet X where tht bn:uftt z1t5(w0 cf(e acceleration due to gravity 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 plane3if gz6gv+ f5pt X where the acceler f3gip56vg zf+ation due to 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 spe.d jqb./vt;+p+ ksb qmzk0h 8aed of 15 m/s on the surface of planet X where the acceleration duem/ vbhq kka+0z.j8btq .s+d ;p 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 surfa-80y6+ vdtv(od do2 zgtob; nuce of planet X where the acceleration due 0gud+do 2o o6d tv-tbn y8(;zvto 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. Ify, o s9o1xgb-4e,rs cn your friend holds a ruler between your fingers and releases it without y4x,gcn9 ore,b1 sos -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 vt/yqgfb e/wrrdn 0 tcj83.20 xelocity after 3.00 s?ytf q8/cbr2 dg0 w/ernt3. 0xj

  A bullet shot straight up returns to its starting point ior/+k)y b brj2n 9 s. What is the init /ykbojrrb)2+ ial speed of the bullet?

  A ball is thrown straight up with ara,c pehxyk3(i j :ic 1-kno,/ speed of 36.0 m/s. How long does it take to returcre c ( -31jnaoiykph i,x/,k:n to its starting point?

  A ball is thrown downward from the top of a building with an initrjbnzf6k/aq1j *4 z9p ial speed of 26 m/s. It strikes the gr p6f1jq4jz b nz9r*ka/ound after 3.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (e api6,c.ri: .vo1:p(ivp obbonly fill in numerical value v1p ri6. b pec.:i(piov:,oabin 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 speed of w27 x97z mjz 8+kx+hx)e jaznz29.1 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velo;iv:5) s +f(u rcsuyjicity at t = 1.0 s?

  In Fig. below, what is theu0s3o5w bal rswdq 85;y7) nmy velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t fp)aj)v-xnm d9/m)h a= 4.0 s?

  In Fig. below, what is the velocity ag78 ikfz)s9 wzw g*p)dqujuh:f22/ayt t = 5.5 s?

  In Fig. below, what dqa0 e1g1dque 2to. vyj5e-4e*gtzs 9is the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average vel6 rgnh6t,y3ddkosqxnd b; 9-.ocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?t5v)zm;;a vrd, id obswf44 m.ty)e+i

  In Fig. below, what is the acceleratii i61sdpl;f5aon at 3.0 s?

  In Fig. below, what k ,y.e15* avvcm*y ,b cawkjc )yn1.xmis the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the averxn ow ni6pn 9g*60quf6age acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 tyy)mz (kv )fhd7(s4wgeq+x7s?

Does a car speedometer measure cuvo3i+wh,nl 5e q :dd:u o5k5speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constant(lwdon(. p1zs .

  The velocity of an object can be negab4z2 i5 yvuny(tive when its acceleration is positive.

  If one object has a greater speed than a second object, tuyf0spaak -.ij4c1p: 29u vqp he first must have a greater ap0sq9fjuc1- p au: 2kiap4 .vycceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling2,m;by sq(m( c:matlxdase) w nx2g), 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 al fo 1.e;wnxf,cceleration decreases.

  A baseball player hits a foul ball straight up into the air. It lec sn7wbl+y.c53i - fquaves the bat with a speed of q fw+c7 . -lcui3b5yns$120 \; km/h$. 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 acce3wsy7hh q e5;.fcry6pdm jm13leration, how does it change if air friction is i6sd3fwe5hh7 qj 3c1my.pmr y;gnored?

  As a freely falling object speeds up, what is happening to its acceleratf rttzrsb3i s6,)1ws :ion, how does it change if air friction CAN NOT b6:), wri z1sttbsrsf3 e ignored?

  An object that is thrown vertically upward will return to its original positio/t6z*oc wr+fu n with the same speed as wc t*+froz/ 6uit had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity(buk n w :;v(4x(rvkja and nonzero acceleration at the same time.

  An object can have nonzero velocity and zerohudvi mhj i33q8aqtzs* .ay1r3//jr p)q09wn acceleration at the same time.

  An elevator moving from the second floor to the fifth n4)x ezq(1 rmbvk 3ci4floor making no stops along the way ha)3ze c v4mrknxb1q i4(s zero acceleration all the time.

  A rolling ball moves fromdp*21pm,l ksk)s5e awct c+e9 $x_1=3.4 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.6 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comph bq io.nz)uk4hy*,idgn 7 w58lete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.6 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 linet9 o3jdyh, -xr:qd cl7, moving 111 m away in 8.8 s. It then turns abrorxjy:dc3 l - 9dqh,7tuptly and gallops halfway back 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 froh4g btav*z71km $11 \; m/s$ to $23 \; m/s$ in 5.6 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 pl,,h 7wtb ar2pxvpcs4s481 b$17 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spee;.(ek qgvu3m bd of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially ptxh7w j 3z)i+top speed aboutij3w7+) xhz tp $10.8 \; m/s$ in the first 12.6 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 unifor1pme+ zgdy9jx,gfzbo**u v1 + mly from a speed of $19 \; m/s$ to rest in 5.13 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. Assumi5fo2 0urm:ei9gl uay*ng a deceleratioufi9e5 uyol0r a*:g2 mn of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gotx5zcahued7 n2:,k 0 uing $25 \; m/s$ 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).    $m$