Suppose that an object travels from one point in space to b1dvf:ju.o w, another. Make a comparison betwee u.w1 dj:vo,bfn the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantamz6o+uht tzb2aig 4;: z xx))pneous velocity?

  A new car manufacturer a bqmf*m24,aw8r r0rzx dvertises that their car can go "from zero to sixty in 8 s". This is a description0b mzq2 xfmwr4 8*ra,r of

  An object moving in the +xfy5)g6 cml qk) axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the lwaai66g pn)3/da*cohv2)r:uh 9 qrx East (+x direction) begins to slow down as it approaches a traffic light. Make aahca6vri * /gla2h )6 39x)rn:quo dwp statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directign 78+5txny4si s 65huy0keebon) begins to slow down as it appros8k 5iush0ygn+xe5 n76t 4e byaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velaqjtufyv67 6 7ocity. Make a statement conceqt7yf6aj6v7 urning its acceleration.

  If the velocity of an object is zero, does it mean thatn o-zo94 nm1vv the acceleration is zero? Support your answer with an exa1-m n9zvovn4 omple.

  Can an object's velocity change direction when ik ,f35ua9v1spljfu* 5m j8oimts acceleration is constant? Suppf*ji51jaku ms 5lvo,pm 8 fu93ort your answer with an example.

  Suppose that an object is movkik0*e. tpm m*ing with constant acceleration. Make a statement concerning its motion with respect tktp*mm *.ie k0o time.

  Can an object have increasing speed whi:vcaos b q(0zji72cm. le its acceleration is decreasing? Suppoz7v ocm c0q jb2.s:(airt your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of icx0 94mb5x yzqy-n0yn7 .grifge. Make a statement conce xggy-5y0rm4q0i xyn7 fbz.9 nrning its acceleration.

  Under what condition is average velocity equal 2e7lm-z5 kxnnto the average of the object's init2 -l7e5n zmxknial and final velocity?

  Objects A and B both start at re7eulax kiz l jc8rw+ du6s0v58:r(uj/st. They both accelerate at the same rate. However, object A accelerates for twice the timev6es/a rru x u(88iljlz+ :k5d0c uw7j as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rebn2hzi+nexo (mac0du (n0.1c 8 tfj4hst. They both accelerate at the same rate. However, object A accelerates for twice theo8n+ 0 0cmhj (fzec inuhtaxd(1n2 .b4 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 falomnn-2be;r m: ls in the absence of friction, which of the following is true concerningm;-nbemo :r2n its motion?

  When an object is releasey sz0/w, z/for6e.oanngy t.9d from rest and falls in the absence of friction, which of the following is true con.f.oanny,/se 6 /y gr9ztw0z ocerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velociny2a6bobo d -igw2:/x ty and the acceleration waon/-:b dgowxyb22i 6hen the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleratiou6o ga b rgqfc.v1fz7 )l;ws03n just before it reaches its highest p1 gv;gqw)buff6 0l7r z. so3caoint?

  Suppose a ball is thrown straight up, reaoj4yrw4 v fjd:,pml o2x(32okj8)pvk ches a maximum height, then falls to its initial height. Make a s8yxo4lp4 fj:2 pvwmvd3k) r, o2 ojjk(tatement 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 toyks 7xi8bz g m87l9)(iw fwpi3 its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming dokwf 8 i mxs73zb()yp8giw79li wn.

  Suppose a ball is thrown downward in the absepj9xg+ze75b8ukak c 7w 70f urnce of air resistance. Make a statement concerning itzu7g5w 0kfu jx+pc7r87bea9 ks acceleration.

  Suppose a skydiver js(n3 c,+ ny*b ,s2ciwb h6xcnqumps from a high-flying plane. What is her acceleration when she she r+ bh,i *bc c 6,n2wsy(ncn3sqxeaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second baz ror: 3j)wyx-u urx-.ll is r-y)w:.3jo uuxrx r z-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 ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B is droppr+h s tr +xpx74px3m;hed from rtx pm;hpx+3srx4+7 h the same building. As time progresses, the distance between them

  Ball A is dropped from the top of ap ,wa 8j+kcu5rkcq b b 4wd4j71u849wm;dpebd building. One second later, ball B is droppe 4w5 9a8b u48kkw wrp7d;ejb4q mub ,dj+cp1dcd from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top o roq or(sy8j0x -8q,axf a tall building. One is thrown up, and the other is thrown down, both with the same initia(q8oros8ja ,r q-x yx0l speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second bckni 7o) 3; .cnv/c )giakva*trick is thrown straight down from the same building. Thktakc7i.vv)g;c aoc ) /nin*3ey are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-: cl.cb ishi5acgzqj;/)08k xzero velocity in the +x axis. The position.xhjl)/85zibscq;i k 0c ag:c versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The pos*4no 1q(uwh k o/bg8 mdcg);hhition versus time grm o*(wd4;q1k b8/uonghg hc)haph of this object is

  An object is moving 4ohd3d5 yf/f (vz og+o2bjq-2rh6 a ftwith constant non-zero velocity in the +x axis. The velocity versus time graph of+ -4ztad3f65hdo( hrfjo2v yof2/ bgq this object is

  An object is moving with constant nglfis28 f:l5dza/a l.hcx e68on-zero acceleration in the +x axis. The velocity versus time gra. gzfel 8s2cxad:h/6 ail 8fl5ph of this object is

  The slope of a positionvhv4l8jppj :vgoy x taon/7( 37;sr-t versus time graph gives

  The slope of a velocity ve r(5ix2u q0*s2bst *0izxj gmgrsus time graph gives

  The area under a curve in an acceleration versus tim4lfx. m0)f 2ueershf3e graph gives

  The area under a curve in a 0cpvsh 7 a5*gtl++ucevelocity versus time graph gives

  If the position versus time graph of a j osoy6q:hh2(n object is a horizontal line, the object ij2 qsh: o6yh(os

  If the position versusz;dras 78s .xp time graph of an object is a vertical line, the object iss;r.z7dx8 p as

  If the velocity versus time gquh0 / 8diyc-yraph of an object is a horizontal line, the object ic- 80 hdqyy/uis

  If the velocity versus time grapvqbr bk17 hw4ug**,p zh of an object is a straight line making an angle of 30 degrees with the time axisrp*b7 ,bu4q*wgzv1 kh , the object is

  An object moves 15.0 m north and then 11.0 m south. Find bothn2-q v y8g8rb 8qrj4wc the distance traveled and the magnibn 8 -cj882r v4qqgwyrtude of the displacement vector.

  A boat can move at 30 km/h in still wao,1iek ifh)y8j*;c4(x ko aybter. How long will it take to move 12 km ups,8 cf;jxhykkb o(* io 1a4y)eitream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)i vjc*n116fl o vc cfy:/ w-w.anfem1)

  What must be your average speed in order to travel 350 km fwu c(qvuapu2)vn/1 ky+,o6 gin 5.15 h?

  A runner ran the marathon (appro+o sr9kebi +j2ximately 42.0 km) in 2 hours and 57 min. What is the averbsioje++rk 29 age speed of the runner in m/s?

  A car travels 90 km/h. How long do w8legkz 2e c48 vdqgr9khn-99*s fzzb6x.ls* es it take for it to travel 400 km?

  A ly (light year) is the distance tp j bjd3*q+; jl/ qdf7w+zzq1rhat light travels in one year. The speed of liqplzd 3qqdbf*;+jjwj r +/ z71ght 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-sjyd5: w-:e riw mf2a along a straight road and you look to the side for 4.0 swf :mj:dr e2i5swy a--, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yost wm-8rop938f v eyd0 7k c:,sxm;okwur average ,o skwwcm r09ymxf;v88pe:t37ks-od velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, mmts;,j a7 h67w od1cm,r;xggthen 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 7;grg 1 awj,msodt;6,c7mhx maverage speed?

  A polar bear starts at the North Pole. It travels 1.0 km soux(c gf4ng:b3 ehe, l;k9o-ruv th, 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 brbg4euk o -;:xvn gec(f, lh93ear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 1m);uv+w wln7iv v,zr 810 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minu )zv mvn78 u;l+,vwrwites. 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 averag75.k w/tul(x m6vjio *s-wub pe speed of the motorist fo/ b*ps6m5 -ukv ojl txuiw(.7wr this trip?

  A motorist travels for 3.0 h at 80 km-;): x1j/lc ,8v 2 nkygf7a2 pqszbt(hcqhrpt /h and 2.0 h at 100 km/h. What is her average speed fo(qy c:,c2t87 1xan qkv tp)/sr-b2hhjpl gf;zr the trip?

  An airplane travels at 300 mi/h south for 2.00 h and) eiwvnnk 5 gb(l8,vq; then at 250 mi/h north for 750 miles. What is the average speed for thbe(in,v5 w )vq;lkg 8ne trip?

  In a 400-m relay race the ancfk-e(bw qf32z lmp+81 tid ;xh5r qog+horman (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 leg -wbm 3+tq g(eko28phq5zxflif dr+ 1;of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 12 s. The cav3h +)2wumg1qflwk mw xgb/8v+f4e m(r's average velocity during deceleration was 64 km/h. What was the car's deceleratio+elqh/vbg2m uf4mfwmg (wvx18 +w )k3 n while slowing down?

  An airplane increase72-g lpr8p fr)(70ae vetekgm s its speed from 100 m/s to 160 m/s, at the average rate of r e f2m7ptge-(pel7)kgva r80$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates uqs gexk,b l3u/-1 yb-otkjsi */ ,rt7at 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 accelerates at8( yi5mazd,dx vou1 g( $4.0 \; m/s^2$ 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 0o 6j-4nic y+xbcmh/,piy1nn with a constant accelerationcn+1np,yb mi4xo0y j -/6i nch 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 3.0 m/s experiences a constant ntk3 ht76t)rbi x. d1sacceleration of bkd6 rni3x)7ht.tt1s $4.8 \; m/s^2$. What is the cart's displacement during the first 8.6 s of its motion?

  A bullet moving horizontallyc; hg:pl, na. j4unvv- to the right (+x direction) with a speed of 316 m/s strikes a sandbag and penetrates a distance of 36.53 cm. What is the ave4p u-. g:hvan nl;vc,jrage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircrxqm;i0h 5g l4raft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration ;0r5lmxhiq g4is constant, what is the length of the catapult?

  A car starting from rest moves with constant acc)m qs/d4pk5hsg q)ek.(kn7 u leleration 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 i )l ekjq(r.uw6n a distance of 200 m. What is its average accelwlu r() qe.jk6eration?

  An object starts from rest and undergoes uniform acceld dv1 :)tzjm*leration. During the first second it travels 4.5 m. How far will it travel durm) vltdd:j*1zing the third second?

  An object is moving in a straight line with consta4rt7iix+lswri: u )x1 nt acceleration. Initially it is traveling at 16 m/s. Three seconds later it +w 7:14tiil) ux xsrriis traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accejmu7 *nn/7e ealerates 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 tv rw l9l28yi0fbld9k4v; 9cgdecelerate 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 b8ii- o6y /e(x9w yjhpmeen waiting at the intersec-8iemi(y 9y 6jx/whoption starts 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 .s7 jbimumgx8f,+9lm(80sqz+* v mo lqctyn1 of 12 m/s on the surface of planet X where the acceleratlmjzc0i.xnq+g* ( 8q9ssbv 8fmt +7ul1,mmy oion 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 sum 74rv:ebext 4rface of planet X where the acceleration due to gr :t4ree b74mxvavity 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 ofzlime )k,xwb2i6mh2 / 15 m/s on the surface of planet X where the acceleration due to g bz2k2/m hixmw, 6)ielravity 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 ml waq ibfy:v7kr,sz:(e y/ z3(/s on the surface of planet X where the acceleration due to gravity i3yqez :lr(sw7f/bvzk(i: ay , s $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend holds a ,c,t lxjy0yjms;6af( ruler between your fingers and releases it without warning,fy6 (,y0t a ;cms,jxjl how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a8ug ns g-/b79w1damwy velocity of 19.6 m/s. What is its velocity after 3.00 dw yawm -8/7gbg1nu9ss?

  A bullet shot straight up returns to its starting point in 6 s.f)sqjezb -e;7 What is the initial speed of th-j q ;bfz)7eese bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does idc(*3q+7izt1 ndv u w3wz;vtcd)q i-gt take to return to its3v1*cwgzdc7 ud( 3vdw)nz-+ i;tqiq t starting point?

  A ball is thrown downward from the top of a buildino)9zq0ocl/. rt 2b hghg with an initial speed of 19 m/ .g9b2 z 0rlcoto)hqh/s. It strikes the ground after 2.2 s. How high is the building?

  A ball is thrown str ll1 *8tn5,9y +5hthgwqukhops w 0l-raight up with a speed of 30 m/s. (only fill in numerical value in the blanksll-l1qr,p9 8 t* h05wshugt5kyh on+w)
(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 tude /j6j 9d*/ fn;kbyair with a speed of 27.7 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 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 at t = g-g/.ihfj/ hy.9u;g a x9m aox1.0 s?

  In Fig. below, what is thesk5.8 /.ynhcjy2hz wg velocity at t = 2.5 s?

  In Fig. below, what is theyvp pkd wn;/3, velocity at t = 4.0 s?

  In Fig. below, what is the g6/1g)nhw4 f ko pfjd2velocity at t = 5.5 s?

  In Fig. below, what is the averageiic 16gg8a -7s 4hctwyfc m7; )pgh4mi velocity from 0 to 4.0 s?

  In Fig. below, what y,l2 *er72vzl jk 6epvis the average velocity from 0 to 6.0 s?

  In Fig. below, what is thvb7tb8:wj q 9te acceleration at 1.0 s?

  In Fig. below, what 4uzxn6 q -30 swfruc/ao cc6t+is the acceleration at 3.0 s?

  In Fig. below, what is the average acch j*;j+pqc-9v4b knb celeration from 0 to 5.0 s?

  In Fig. below, what is the average acceleratut v4e+zfgfokd28 /9t ion from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0g64 : e8fhxa n8bhel;z s?

Does a car speedometer meae4 akr-vhaba0 z0g s62acej( 0x (h.qzsure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is consta jelmr*r,k -)mnt.

  The velocity of an object can be negative when its acceleration is positivc)a) o y* bk gtkqqpd+8/f:(see.

  If one object has a gre z :ctgash9x-q9wai. 9ater speed than a second object, the first must have a greater acceleration. 9xzwcia9h :a.9tsg-q

  Two cars emerge side by sideky u+i:.p fe3j from a tunnel. Car A is traveling 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 acceleratiom8af t/- bmpy/blxi0 4e5 tvk+n decreases.

  A baseball player hits a foul ball straight up into the air. It leaves thvj0n g61mi0gk e bat with1vi0kgn6 m jg0 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 acce16xwe z;0h(by0 : xzc oxc,lfhleration, how does it change if air frich (:eyl1f hzoxcc,zx x 0;60wbtion is ignored?

  As a freely falling object speeds up, what icb kg et1g,++3tfa8uns happening to its acceleration, how does it change if air frg,8+ f1gtb3 ntceaku+iction CAN NOT be ignored?

  An object that is thrown vertically upward will returnl5w(n0 rj 4ui,ob3rin to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this res 3lnj o,ibi0r5wu( 4rnult be altered?

  An object can have zero velocity and nonzer 0cqe yl3g77:c+ xfobco acceleration at the same time.

  An object can have nonzero velocity ar 3gn3aqfn*9uq5r9g bnd zero acceleration at the same time.

  An elevator moving from the second floor to the fifth f7gdzr7r6jb ps5i0xe4 0osy e+ cj5lt(loor making no stops along the wayi7je 0+ers o56x lpgzc5s0 b(4 r7jdty has zero acceleration all the time.

  A rolling ball moves91 d d(n nv:e7ehs-nvt from $x_1=3.4 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. 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 $x_1=3.3 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around agp1+xo o +lq cn4phk03 quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.9 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 lwkco/tb6w 6svo.6h 3z ine, moving 112 m away in 8.7 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (6 hcwztk w6.6o/sv 3oba) 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 from)or 1pqkk58 1tafe*x1a zue- d $11 \; m/s$ to $23 \; m/s$ 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 frodu2unybu m i1q hr-))0m $22 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a rejhzp9i 8 7 el)iyk+,0h95zg qbj rm;speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprintet bi(yic81/pvnwqrkvm06fa z x5* 8xq ,ekk ;9r can burst out of the blocks to essentially top speed abouem9qtr aw,cf *;q5(1 k/0i kn8x6vzpkb xiy 8vt $10.5 \; m/s$ in the first 14.2 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 unij,ek q o46tcv si-.y)oformly from a speed of $18 \; m/s$ to rest in 4.65 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks /8tzfg*l;i/ubc j 3vt 92 m long on the highway. Assuming a decelerationf * 8b vlz/ct3j;gtu/i of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$