Suppose that an objecm2m0q yp:+i3l,vyly,n eyoont z 4 1+it travels from one point in space to another. Make a comparison between the displacement and the distance trav:o ,im2yeynlzyy+l0,t4v3q noipm+1eled.

  When is the average velocity of an object equal to the iu*qc9cs) r6h knstantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 8ti35+4x 4n mg w7e)3xm pmhf16qhnyxb s". This is apymx 3 xthnmh7 xnfi3bg4+ emq1)64w5 description of

  An object moving in the +x axis exy:s7sg1r2( 7k op1 hvy7wuf nkperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelinq /osz57e qm1 jlf(-rag to the East (+x direction) begins to slow down as it approaches a traffic light. Make 5f1sjel o-(/q m7rqaz a statement concerning its acceleration.

  Suppose that a car traveling to the West xb;xud3w9g/t (-x direction) begins to slow down as it approaches a traffic light. Make a sd9x 3uwxbt /g;tatement concerning its acceleration.

  Suppose that an object is moving with a constant velocity a6 7qtg5-swz4khtc5w . Make a statement concernizchq7w -g4w5 ka tst56ng its acceleration.

  If the velocity of an object is zef n, y0m jtx0qgjk.;iom8q-e0ro, does it mean that the acceleration is zero? Support your answer with an example. ; .m8fgik0y0 exnqjt0,-jqo m

  Can an object's velocity change direction when itsb5ern lohzl * 5m7sq.. acceleration is constant? Support your *mh5l.z5nrq 7lb e. soanswer with an example.

  Suppose that an object is moving with constant acceleration. Make a stq v) lw)zeklo+yj(j-jw5+;l otca)9uatement j+ y);-lctloea kv9quo5)()zww+ lj jconcerning its motion with respect to time.

  Can an object have increasing speed while its accelekyar 7g)gc) ;iration is decreasing? Support your answer with an examp)7)kryagg ;i cle.

  Suppose a can, after an initial kick, moveaxjb 76 m4nnt;s up along a smooth hill of ice. Make a statement conce76ntn 4bajxm ;rning its acceleration.

  Under what condition is average velocity equal to the average of the object8 d+ie pxl5x -*ylhg,vlb/ mx:'s initial -8d b/v lxhl gxe*xy+i:,l5p mand final velocity?

  Objects A and B both start at rest. They both accelerate.h g)tm1)i e95 r hfuxmsmxwsc4:5*kd at the same rate. However, object A accelerates for twice the time as object B. wtgkmcssh: .dh5*5x m 4mfr 1i)xue9) What is the final speed of object A compared to that of object B?

  Objects A and B both start fromcj7(4 +3 ce lhf/5vyujcrk .qh rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object5q 7fckjr( yc / e.hh4cuvjl+3 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 thdvgkf 5+1bjv ;:e;c,tsh edx3e absence of friction, which of the following is true ccsh 5jg,vtd+e;:xvb ;ke3 df1oncerning its motion?

  When an object is released from rest gx olbft nv2+5;axlo02 f8(bs and falls in the absence of friction, which of the following is5ofv 8x(glol 2+ bn 0tsfax;b2 true concerning its motion?

  Suppose a ball is thrown straight up. Makey+y1 fa-c* i3o)vaskf a statement about the velocity and the acceleration when the ball reaches the *vsfik+-a3)ayo fy 1chighest point.

  Suppose a ball is thrown strg w2ste+hkpk 36n6jc: aight up. What is its acceleration just before it reas2gt+36 :pewjnk h6k cches its highest point?

  Suppose a ball is thrown straight up, reacx+zv43n ik dp2hes a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as thipkvd24+3 z xne ball is going up.

  A ball is thrown straight up, reaches a maximum heigh j9e33d8 3p p*ep.ttr mrjci-rt, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the bal rct3re*-tpjj8pp r3 i9.d3mel is coming down.

  Suppose a ball is thrown downward in the absence 6)ych2pbr : , 6, il*bp anmri:heq9zfof air resistance. Make a statement concerning pf yha 6nz*emq 6 : b9bci2)i,rl:r,hpits acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is herix0b,k3-zy 8 xbmttu5n vf;c7 acceleration when she she reaches termin;x5vtbkim8n, y7 fz butc3x0- al velocity?

  A ball is thrown vertically upward8fu1s c jsm2(8 huf3yy with a speed v. An identical second ball is thrown upward with a speed 2v (fsfmh1 u(83 j 28ucyystwice 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 ball go than the first ball?)

  Ball A is dropped from the top of a buup b/fz5s540l 1fjmhlilding. One second later, ball B is dropped from the sam0sb4 fm l5u5flhjp/1z e building. As time progresses, the distance between them

  Ball A is dropped from the top gdj:amc0g10rn 4ipk;of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in thi g :0jrk0n;p1dacg m4eir speeds

  Two objects are thrown from 5wgmcx1tr- +bidwv61 the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speegi- 6m5rx 1cd1+vwbtwd. What are their speeds when they hit the street?

  A brick is dropped from the top of a buildin o *xz(47laq9thsrsg (g. A 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 s4 r t((*x9a q7gzsohltwo bricks.

  An object is moving with constant non-zero velocit;j d,yp6k*zah y in the +x axis. The position vepj6 y*dah,;z krsus time graph of this object is

  An object is moving with constant non-zer 8w3sxw0i*k azo acceleration in the +x axis. The position versus time graph oiwxw*kas 83 0zf this object is

  An object is moving with ld0iw ( 9df9fs)qr zolw2s+pn 5st *w/constant non-zero velocity in the +x axis. The velocity versus time g rp(s59 nw/f +2iwq*ld0wdlz)osf9st raph of this object is

  An object is moving w2hjo*pu/d - js6 -pluwith constant non-zero acceleration in the +x axis. The veloci- u2jwhpj-l6u/ *spodty versus time graph of this object is

  The slope of a position vet0k1oike 9 t3 qevuh:/rsus time graph gives

  The slope of a velocity versus time gra;qb3b2l - *)tllv edag-+jtek9(ga izph gives

  The area under a curvesoqz,6 +:q c/r- pba7vlu mv+p in an acceleration versus time graph gives

  The area under a curve in a velocity versus time gr shcs3g*g5i2 img-i2k2 yyy7p aph gives

  If the position versus time graph of an objkm84+ 1wqi+bv e y)1vz ischf.ect is a horizontal line, the object + 8)1cyb4vm1q he k.if+zsi wvis

  If the position versus time graph 3l is3dy10 p a,czh dcxh:d-y6of an object is a vertical line, the object isi1-adzdc3d6y h lp,0chy:x 3s

  If the velocity versus time graph of an object is a horizontal line, thntqdmto) hm .6b.c;( ke object is6bttq cm hko(d..)n;m

  If the velocity versus time graph of an objecl3w a229ondqgoi6+z8kfq1 f pt is a straight line making an angle of 30 degrees with the time axis, the obai +8nq1oz2 2ol36w9kqffd pgject is

  An object moves 15.0 m north and then 11.0 m south. Findyo1xj.1ea+ 1/) e bmsi.ap 4m-n qjvlp both the distance traveled and the magnitude of the dis pq s4j p1-nxe/ibay 1.v+m.o 1je)amlplacement vector.

  A boat can move at 30 km/h in still water. How long qr1bfmx 2kn- -bp3m t*gyk* 2lwill it take to move 12 km upstream in a r -tnl-fbmkb2*32qp ymk x 1*griver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 )fd on;qu)xzn eco9f 2hh6y 13m)

  What must be your averagotlt+5 z6o/rf e speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Wqre-j 8jc97wk qxbi2/y*3yh ohat is the avyow-7jeqhqki/* 2 y9x 3 8rcjberage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 40qbrr).-7 tdm1s1lzj 4 njd rn30 km?

  A ly (light year) is the distance thz9mpts d b7q276u.u yrat light travels in one year. The speed of l9.7qby smpdrt 2u zu67ight 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 straighfn, bosbr/x b z+2hh*qct:( a(t road and you look to the side for 4.0 s, how o*nb2rtc( /b+ h sazhqbxf:, (far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s f cy9s3ejwnsj(e9;r 1, your average velocity e;wjes 9( fs13yr ncj9is

  A polar bear starts at the North Pole. It travelb ys-:shob8n /s 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to returbh yn:bss/8o-n to its 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 south, t gum2,3;eti kthen 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 vi gum2tke,; t3elocity?

  You are driving home on a w;w um, ct3t q4a;5b1y4vkm vwjeekend from school at 55 mi/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 minutes. How far is your hobcaj5 kmqt ;vv;1twm44 u3y ,wmetown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h./b d0rl 4+gy pvii c:4.hir8q tjb8*of What is the average speed oq/fb+.8icv*:r 4yit prdgi o hlj8 0b4f the motorist for this trip?

  A motorist travels for 3.0 h at 80 ik 1s/yvb /1 8dlnrvpc7n6a* vkm/h and 2.0 h at 100 km/h. What is her average speed for the trip?l16p1aksy78 nd vr* icn/ vvb/

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nort 7 mwj35bymot8 dz db4s0*7ucbh for 750 miles. What is the average ss7bc 8 td7w*40 zm5dybj um3bopeed for the trip?

  In a 400-m relay rac :zalu2v3 tco6e the anchorman (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 l3 lcuazv:to 62eg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformlypbrq68a z(p, yj6 e+apy;tq1q and comes to a stop after 8 s. The car's average velocity during deceleration was 47qpy(j6a;+tp ezbq1,y r6 a8qp km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed fs1lflca7c/p0m9 z7 / xi/ t-q *wzldlhrom 100 m/s to 160 m/s, at the average rate of z7stl/ iw c/pl ma/1h -d97xzf 0l*lqc$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerh4*h(uxylw 1 y4mq mwtds.++ k,tsi2sates at 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 and accu: *u.8 cwxokcelerates 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-zmm2hj6azg /;oe+l p. It then speeds up with a constant acceleration ofgl62m+zz h p/-mj e;oa $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.9 m/s experiences a conh.i jot-0l8s6c ; l6/*thugvba:m 2 vqj6pbbystant acceleration o v :hgjyluib0t;6b66o h sb pmjac2t8/v.lq-*f $1.6 \; m/s^2$. What is the cart's displacement during the first 5.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) 1uvh emhao *h)ahv -k te+i14-4lbb2uwith a speed of 569 m/s strikes a sandbag and penetrates a distance of 61.77 cm. What is the average acceler*v1a2e4-h+hlt4uo a)hhb-b vikem u1 ation, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircra5yn5 bfhv):srfcg vtp;6: ja7ft 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 constant, what is the ljrsv n 55: h;6p:f7bfc)g vyatength of the catapult?

  A car starting from rest moves 6eevxx6594n jjsn4cx 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/s in a distance of 200 m. What is its averdb)ud ak806y c; sccesd22hi 7age accuc sdsk2h ) id2e8;76yd0cc baeleration?

  An object starts from ree:xn u0s qh cetih-im rgf8;kyh7y-d, ;gd, /0st and undergoes uniform acceleration. During the first second it travels 5.2 m. kr,0 nuy d-ye ghg/;8hs hq7-ftii 0mcd,:xe; How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initiallyy4-sq; q k8lruz:iu,ig7nt9k it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this tim;7slk,i4g qu 8it :k9-yz runqe?

  A car starts from rest an; p1/wwhrk(mn+au+j md 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 tiresvbh( cc fvvw6zg19y), 7ca3t d 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 -rjbti xcs,rx 4i6l0 0car that has been waiting at the intersection starts aheai xx0ri ,b- l0rsct64jd 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 3 (gku(bwkct.f.a0 g3 gce(ep12 m/s on the surface of planet X where the acceleration due to gravity a.puc3g3k(( bcg0ftg. (ewkeis $1.5 \; m/s^2$. 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 whg yvypk8 maawx(x +igk..n6( ;ere the apy+ (xmyavki86 ;ng.x( .kawgcceleration 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 ,vrv d)gwn l)-with a speed of 15 m/s on the surface of planet X where the acceleratio-)vnv l),wrdgn 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 surface of l 2pf6281q 4bi nf6hurrhtpif/o-, lqplanet X where the acceleration dueqlph8-46p,nh tflfqf 622riboi 1 ur/ to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usur/+ 3ei e-eainally greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall rieei+an/e3- before you catch it?

  A ball is thrown upward at a velq1k)na jyy0)zonn ;n7 j ck)0bocity of 19.6 m/s. What is its velocity after 3.ncz700) n aj)jbqkk)1ny ony;00 s?

  A bullet shot straight up returns tv4r*v*r* saepu1nc0 do its starting point in 5 s. What is the initial evvu* 0*s*1 cranr4dpspeed of the bullet?

  A ball is thrown straight up with a speed of 36gm 01z i*hwvz,.0 m/s. How long does it take to return to its starting zh1v*w,i zm0g point?

  A ball is thrown downward from the tl:f.gv4c 0z d:fsk xd0op of a building with an initial speed of 19 m/s. It strikes the ground after 5.6 s. How high is .d04sx:lv0 c:kfdz gfthe building?

  A ball is thrown straig1p7bg x lw27tkht up with a speed of 30 m/s. (only fill in numerical value 7lgtp b1k72 xwin 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 (jpo vj r s 6c-kx++r 1m7.mh*hd7pujtair with a speed of 24.4 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 iso z:*m4llwnm 0rr3sp; the velocity at t = 1.0 s?

  In Fig. below, what is the velocijk5 /,+d.uh2saou bpsty at t = 2.5 s?

  In Fig. below, what isg-o lfr0q yg)* the velocity at t = 4.0 s?

  In Fig. below, what is the velh 4de36o yemn/ocity at t = 5.5 s?

  In Fig. below, what is the average velocity fromq71jn 8se64szkaq.d m 5mj:rk 0 to 4.0 s?

  In Fig. below, what is the average velocity frz*g/es hxt ywok/7 9g(om 0 to 6.0 s?

  In Fig. below, what is thwf lm8x -ckn 2a5qu6*qe acceleration at 1.0 s?

  In Fig. below, what is the acceleratisbnjzx g7 * *z2ethl5d7pu1w 1on at 3.0 s?

  In Fig. below, what is the average acceleration from 0 u cv.mcx -va2 0 29kf/syagx(. 9pmgttto 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8j(op ))sr h3h/ + h1azvty5ibd.0 s?

  In Fig. below, what is tc)139f bosfbfh (yd. uhe displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|ve: 2+mmy1e7 lag6aadlk locity}

  An object can have a varying speed i3uez n tg4y .i /7nh0dmral, 3iksfe(8f its velocity is constant.

  The velocity of an object can be negative when its acce qw o-lsvj, 851zoupe8leration is positive.

  If one object has a greater speed than a second object, the fiv/(4.ff tddd 42gk dslrst must have a greats(td d d42 /.vdkff4gler acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling wit:q aa -npkd a/l;/rpi+h 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.9j rdm r: w1iq1l:abl acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves th / (y8 lu*jwgb.+bs heggd4 :jenqg29we bat with a spe 4:jh b8 suwq(/gl9y.g eebw +*ngjg2ded 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, hol,cijb9 h/ p/gw does it changc hb,p9l//gji e if air friction is ignored?

  As a freely falling obje /nlol;,d,zlp ct speeds up, what is happening to its acceleration, how dll;,ponzld/, oes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its or 9bczxj3z7sor)( h-sw iginal position with the same speed as it had initially if air resistance is neg9-jhwb(z3zx s7 c)rsoligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at 4:pqwo/5ag ri +34f6 wgsoovkthe same time.

  An object can have nonzero velocity and zero acceleration at the sa czor /xesv8zd5d.7 (zme time.

  An elevator moving from the second floor to the fifth floor making no st4)z x7f)k( l u5:viwob au3ekyops alonwxl5f(e7v o3 )) ukk4iyu b:azg the way has zero acceleration all the time.

  A rolling ball moves frokagxy/rc6 *-u m $x_1=1.9 \mathrm{~cm}$ to $x_2=-6.0 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. 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 $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mi 6g1po*m0a,j:cy.baw oci(vu le ($1 \; mile = 1609 \; m$) track in a total time of 11.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer a2f8jc8v j/ fllwp7v.in a straight line, moving 95 m away in 13.8 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (.afl2lv88 p/v7wjc fja) 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 fromnq3 rqgp zqa5 2jg4.4j $10 \; m/s$ to $23 \; m/s$ in 4.5 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 from6 2gse0 j-noi7 in9j1doov4ea r3 vb*au9/nkb $16 \; m/s$ to rest in a distance of 76 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a 1, 0enzmu bsh,)v*jsf9y7hl zspeed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to ess 3/+ wjvckn+lv xz.e(eentially top speed about( xe/j+w.e kvlz+cn 3v $11.0 \; m/s$ in the first 11.2 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 spet)ki(*n bnjc33ewid xa* ,z8yed of $19 \; m/s$ to rest in 4.85 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 ff9wvn; p1t2p on the highway. Assuming a de29n1wft fv p;pceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going shw 4t;ev 9:w nlj4)fy$25 \; m/s$ 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).    $m$