Suppose that an object travels from one point in space rvyf , .v-k4.suo koh4to another. Make a comparison between the displacement .k.o -uhf kr4o vvy4,sand the distance traveled.

  When is the average velocity of an object equal to the instantaneous vju5c ki e/ia4.elocity?

  A new car manufacturer advertises tjuzrmcs:c 0u0ub( 9p+hat their car can go "from zero to sixty in 8 s". This is a descriu( u0csu9 rbmzp0c :j+ption of

  An object moving in the +x axis experiences an accelerap65/0q pna xfption of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to4frkdjsvzm srt jftp6/-.;.+ the East (+x direction) begins to slow down as it approaches a trafk6; m. r+fjtd .pj4zs/vfs t-rfic light. Make a statement concerning its acceleration.

  Suppose that a car traveling j3;(q m,rxl eu3l9udayca6x6 on+np7 to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its ac6mlo37cj9 ;( a6+u3a nryu lx, qndxpeceleration.

  Suppose that an object is moving with a constaz4s/ove e* 5kflv7vp,wax(bj-.) v q ant velocity. Make a statement concerning loj*k)-,4vvwae .(7vvpf s qb/5ezxaits acceleration.

  If the velocity of an object is zero, does it meamharq2 qruu)1 y(hv)n m*a-.zn that the acceleration is zero? Support your answer wan-*rm 2hv ) . umua)zyqqh1(rith an example.

  Can an object's velocity chanme f. fh190unoj2gj0oge direction when its acceleration is constant? Supportonm gfujj2 h0.1f0eo 9 your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a st3ad okxtvu4*g* zg m8*atement concerning its motion with respecx3dt*gu4z8 gv*kma *o t to time.

  Can an object have increasing speed while its acceleration is decreasing? a:ysikzr 7 msmb2-7 g jlo4(.4byd9vdSupport your answer wsibd.479l(a rymdz2k4gsob-v yj7: mith an example.

  Suppose a can, after an initial kick, moves up along a smoot 7z3 vhcaci25ni+/fu eh hill of ice. Make a statement concernfc7 nuie3 c+azv25h/i ing its acceleration.

  Under what condition is average velocity equal to+i6sz 0m9rflfg*a6y g the average of the object's initial an6a+ig 6fzf*r9 gy0 smld final velocity?

  Objects A and B both start ;;og1d( c o:zswd03tzal ab* vat rest. They both accelerate at the same rate. However, object A acceleratesobzatszcd; 0d wal3gv;1*o(: for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start frr n.qr,b5( mrxom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B.5r nr(mqx. b,r 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 absen(a; jlk,sf9)-j9hd e0umycgjce of friction, which of the following is true concerning its (,;e j0mklhj9 fayc j -9)sgdumotion?

  When an object is released from rest and falls in the absencexlh7lf(9m ; zc,x4itw; qo4xn of friction, which of thm7;94n x(fo w,; illc tq4zhxxe following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement abo5 q; o2rwdp hmu;qla18ut the velocity and the acceleratl8m 1o uq;2war;qpd5h ion when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it0vozwr 72y 0e+a qw4os reaches its highes70 q+2asw4eo0z ovywrt point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to iwzl88 1q t6rarts initial height. Makez 1w8ar86rtl q a statement 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 fsjqg9m5lio1f3y .a(to its initial height. Make a statement about the direction of thi9yogf3 a(m1ls5q.fj e velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air 0a 26sjst:zc5 hk cgwy77ff8b resistance. Make a statement conh zg62wa7:7sfyk bj05ftscc 8cerning its acceleration.

  Suppose a skydiver jumps from a high-flyi+wqlw;zk,..;dy j cfqng plane. What is her acceleration when she she reaches terl+y .fw wzc;kd;q.q, jminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second balr8o6eof l10je(rt 1lhd4p+ltl is throwoll68+eo1d t r4j0 p1(hf retln 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 - vj: 3bghho*dB is dropped from the same building. As time progres:-hgo hd3bv*jses, the distance between them

  Ball A is dropped from the top of a building. One se.y6xh*+ayi xe;-s 84mc enekrcond later, ball B is dropped from the same building. As yee m;-nai sxex8 *6+kyc4 rh.time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building jyv0 ,tkvdx.6. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hidvv. j,kxt 60yt the street?

  A brick is dropped from the top of 7wufsslx 75h1a building. A second brick is thrown straight down from the same 7u15fhs7swl x building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in th4sk;t( c;t.px n 2xpvke +x axis. The position versus vxp2;t;s cp.nk x4tk (time graph of this object is

  An object is moving with constant non-zero acceleration in tdmewfv4)*5no) nh *l ihe +x axis. The position versus vn *i4n)w5 *eflo) hdmtime graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocitrp.btq7l vu+ov9 opp/l3 sc hdj/:*5 oy versus time grat/v. /udo+r73j9: vlpp 5h p c*booqslph of this object is

  An object is moving wih/ flikd8s )ee4nd/ o ee 9*j-pqa.1kdth constant non-zero acceleration in the +x axis. The velocity versusqdho9 el)d dj e8/1-kpei/en. ksaf*4 time graph of this object is

  The slope of a position verjyh/ ,ni :oo7+3uoi7k g;yji ksus time graph gives

  The slope of a velocity versus time graph xboa3q:hzv l /t* xk ag+5t+dg8;fwp) gives

  The area under a curve in an acceleration versus timdqj;,o j z9u/ue graph gives

  The area under a curve in a velocity versus time g s4 (f y0h)jv,jafn4diraph gives

  If the position versus time graph of an object is a horizontal line, l ,xjdh4c0p ;y:nd cx7the object is;xd, 7h dcj:ny lc40px

  If the position versus time graph of ((xurduoj 2 j *3+2q)gwchsfuan object is a vertical line, the object isc2 s(oj2 (+rhquf*jg 3uwud)x

  If the velocity versus time graph of an object is a horb1 o 9g m9g-zovtaw/9yizontal line, the object 9oy1b-tmzavog9 /w 9gis

  If the velocity versus time graph of an ob m;, 36wzsgqwoject is a straight line making an angle of 30 degrees with the time axis, the object mzq,36s; ogwwis

  An object moves 15.0bx prn,p5g lb+h+y,7 j m north and then 11.0 m south. Find both the distance traveled and the magnitude of tnp7ghl5,+ ,rxbpbjy +he displacement vector.

  A boat can move at 30y*sv2 soo862jtli ms * km/h in still water. How long will it take to move 12 km upstreaml2si *smysj 26t8ov* o in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1 p7 c- zp9ttnhqqw74 e*zf3y dod*,dk-609 m)

  What must be your average speed in order to travel 350 km in mak(a7m )9b2kyugcq x w9*;xi 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57a- 8jesn 5h1qr min. What is the average speed of the rh 15a8qsjne- runner in m/s?

  A car travels 90 km/h. How long does it take fow n*l*ma 4-n sn .vd-u6mrbu3 6cb2gjwr it to travel 400 km?

  A ly (light year) is the distancqdn4pvm 269g-sezks 6 e that light travels in one year. The speed of lk2 s6zv - 96gnpmsq4edight 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 alongvv7yb+dkr3k 6;fmhy 5am4bt0 l v)r:g a straight road and you look to the side for 4.0 h ) bfl;vygy6 k:m0trkv3a5vrbm+7 d 4s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 10uz(71/chym6w .wus fmqq4;ecy y f,r00 s, your average velocsmf4ywc;yw0e ,/q. u6z1fc (y q7uh mrity is

  A polar bear starts at the North Polpgx ; a*r *+/ov6kmdmgh49t-hok5m ixe. 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. o;mox+*xh9v-ak d6tmmig r5/4 * gkhp 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, then 1o8; pzw: tf 9gsx o1os91)e a1ryweyq00cl1br.0 km east, then 1.0 km north, then 9o)o wyq0pxyf9:rg sw10z11lcr s;1t8ae b oe1.0 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 m;-d(n -a tmw5 mrclr*9ps3fv* brw7dy i/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 fpma9cb 7-wr trrn*;dwsd ym*-3l(v5hometown from school?

  A motorist travels 160 km at aao76prkm)lo-z u02f 80 km/h and 160 km at 100 km/h. What is the average speed of the motoris0)zu72-aokfrpa6 lm o t for this trip?

  A motorist travels for 3.0 h at 80 km/h y 3(.j*9 azzpuef5rhy5 (kxym*i0ewg and 2.0 h at 100 km/h. What is her average speed for the trizpiry.09z* 55fah wk ue*( yx3gejm(yp?

  An airplane travels :q 5n wksw2.lqgq-ph6at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. W5lhqqp.2 wsqw g:k -6nhat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for t/h)y 5ixsd)oxeam A can run 1/xh5do )six)y00 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, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 12 s. The car's avhs2a 5z-4mprfi5q : dwerage velocity during deceleration was 56 km/h. What was the car's dec42w:-h5fm z q 5apisrdeleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at thb ds9pkn*n.7 op4lj5ee average rate of o5 enknl79 jpb*s.d4p $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the bon8kgi; c 2 1n96hlunrate 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 and7cja- a f)k uq :ayx,6jzz.3ij 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 1u t9 soply m)*v;l7-hq0 s. It then speeds up with a constant acceleration -)*l; 7 hul oms9yvqtpof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.5 m/s exp 6e+8+vcbixdu jgm43/fr ;ke;p6t w jceriences a constant acceleration ofr8b+gwpe/v;i 6;3c6ju+t fcd4xk e mj $1.1 \; m/s^2$. What is the cart's displacement during the first 8.3 s of its motion?

  A bullet moving horizontally to the right (+x direc7 kd3-zpc f gf7.jgi.t ni6(ii)ekm+ction) with a speed of 365 m/s strikes a sandbag and penetrates a distance of 87.32 cm. Wh 6i.+)ekn -t7kfic fp(7dg.izm gc3 ijat is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catthoqd96wo r7 :q 0dmzmq:spn.4h6p7 a apult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this reqm7d7oqz: qson h:dmrthp9 p.a 466qw0uires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from l1r k7uxf s( 0xp.ig3rxrp/ip g; o3u)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 t:li gnfq71rk x+k- zi-o 80 m/s in a distance of 200 m. What is its average acceli rqknk1--f7 zlgi:x+ eration?

  An object starts from rest and undergoes uniform acceleratio0z v oyedw:.)un. During the first second it tra)w: du0.oveyzvels 6.1 m. How far will it travel during the third second?

  An object is moving in a ib *r/q.7othm straight line with constant acceleration. Initially it is traveling at 16 m/s. Three secm7tr*/hq o ib.onds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from restp5 ikv;gu+z8g9 ; gppr and 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 tires on a d)- l7oc,pg ekyr 9v1cf (6rpeary 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 that has been waiting at theivc5 vlne: 6-jqo k)*o intersection starts ahead with a constanok6noei :-5*) vjlcvq t 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(z1jvgp/em +b e surface of planet X where the acceleration due to grg pvjb1+me(/z avity 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 plan,5a ymmul)4 exet X where the acceleration du,leu a4m x)my5e 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 speed of 15 m/s on the surface of planet X wmn 9u bpm.9zmnu j atqy;i1t 4x:;:q.hhere the acceleration due to gravia;ijhqn4tym.mnu: ; z1:p 9m.9x ubt qty 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 lmt+9 qn-bk:35jf ybjdgk2n 3 planet X where the acceleration due to j92jfdgbykb+ m3q5l:t3k n-ngravity 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 v;zp5p)ik9b9 5ht)g6 gl.uusvcq4 yi.10 s. If your friend holds a rulers.ggq) ;cyv5i4vulth pu9b5pi9) zk6 between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.sdgq5v igit5tt z35- 5u -rygnmq:-gops(9t36 m/s. What is its velocity after 3.53ytgus-np tio s :gg5qr5qtzmdgvt-53(- 9i 00 s?

  A bullet shot straight up t4: rltiajx5;ghdp;fs6h-)q returns to its starting point in 6 s. What is the initial speedpsr;jhltxd ht6i- g)4;a q5:f of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Hn u0 aivc* r7pd;i/b8cow long does it take to returnc;nadi r iv*cu0 8b7p/ to its starting point?

  A ball is thrown downwa mmk*mw7,3ib dq5xf*srd from the top of a building with an initial speed of 15 m/s. It strikes the ground after 2.4 s. How high is d7**w sxfm5m3bmk,qi the building?

  A ball is thrown straight up with a speed of 30 m/s. (on+sobvd*0)ft9yd 5r wmly fill in numerical value in the blantbf + 5*vw9ormsdyd)0ks)
(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 speedl(0(8jxd 5r ; 6bi(npdvhvrcy of 26.7 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 1 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 velqvd (piw wtfp/5662uzocity at t = 1.0 s?

  In Fig. below, what is the velocity am2uf4rem6 ik.n , s*qat t = 2.5 s?

  In Fig. below, what is the velocity at .g)6 /c- edd0ms1 msoqrufd,t t = 4.0 s?

  In Fig. below, what is the velocity at 0ecs9o q0-b4adesu3e t = 5.5 s?

  In Fig. below, what is the average velocity fr +1so.+vkv60yn t.uvrl2djxf om 0 to 4.0 s?

  In Fig. below, what is the average velocity frb:vg q )pl47fn hq8(tkom 0 to 6.0 s?

  In Fig. below, what iqy 3pqa8vvww t2a1pb 4 y9i-7ks the acceleration at 1.0 s?

  In Fig. below, what is tn9ftf)9q rp5g he acceleration at 3.0 s?

  In Fig. below, what is the averageqx,4*l vfxo9ro- 9 voq acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelg6 g 5zo4fza yhfub0n3wn86ia7r p+f* eration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0e4g te nce7v:hu:i48n to 8.0 s?

Does a car speedometer measure speed, velocity? {spi so(mtlf(b*+ifw ).weed|velocity}

  An object can have a varying speed if its velocity a5e 3w:p7v pycgw1 o7gis constant.

  The velocity of an obje4 ;qegi(i*vk z7ghg rrtz6b99ct can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a gr kd.y: m3yt5nzbrgh4,yc 62sf eat,y 2fmtyzc64 kgndy3r5h.s:b er acceleration.

  Two cars emerge side by sidoku afbsyr 67;p-;7 eo5ju6o vjmu4o(e 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 accelern rr 6 f51/z9 jfz-t)fooft9uuation decreases.

  A baseball player hits a fty5qg .ujtdx 8v9+f)k oul ball straight up into the air. It leaves the bat with9jqx+.)8ykfgtuvdt5 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 45ky2u.hq /dkm,fwr mup, what is happening to its acceleration, how does iyrmu/4fk mk dwq,5.2 ht change if air friction is ignored?

  As a freely falling object speeds up, w4u/ ,eqbsf gxh;qkb2-l g2 k,-j1xzkdhat is happening to its acceleration, how does it change if air,/jxsd12bg kq2ql4h,-g ubzfx-k ; ek friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original pos3vx,c n bu3x 2vgv5eo8j q,p2rition with the same speed as it had initially if air resistance is negligible. vqx2b8v e3 2org3 n,uxpjv5c,If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero as q ;coel8 uoj:)/xqo*cceleration at the same time.

  An object can have nonzero velocity :xzx(e3ms 5ym and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no 9w4 j bnqz:vbn- br0 xt6q)x-qstops along tq0xn6 :wb -q9-x4b jtzv)bnqrhe way has zero acceleration all the time.

  A rolling ball moves frool10 m72 -cbpq/41h,ppv usozgnsp 9hm $x_1=3.4 \mathrm{~cm}$ to $x_2=-6.0 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.8 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quh5f(o) zq0o d;b8wuud arter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.3 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 ;eozo a9ph6e+line, moving 101 m away in 12.8 s. It then turns abruptly and gallops halfway back in 4.7 s.oz6;eeho +ap9 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 fr66nk0 m 7nsz.mp izka3om $10 \; m/s$ to $22 \; m/s$ 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 froq0)e r8i wa)xjm $21 \; m/s$ to rest in a distance of 61 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed mx8/ ptqe/bhasu i3).; n fh4kof $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter cag akf q 3q7z6pta5;fz3n burst out of the blocks to essentially top speed abou36a3 t7z;pq5kaf g zfqt $10.7 \; m/s$ in the first 11.0 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 n(/f9 z :nenqao5tqgb2)pe k+gy:bo9of $17 \; m/s$ to rest in 4.44 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lonwfv1g(b44n3b) ngdf mg on the highway. Assuming w3mbn 4v)4gd(fn1gbf a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g5ac,f8z t,v euycf/ j;oing $25 \; m/s$ 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 10,00ix w8 3bjw/bpr- f)pxji-a3fuuu p4(00-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m )-ub/fpa34 rjbix(8p xipww j3 u-f0uto go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$