Suppose that an object / dsd(x-;6xl+em2se 1anpt o wtravels from one point in space to another. Make a comparison between the displacement and the distance travem(/peo2a1xstl d -;nxw s6+deled.

  When is the average velocity of an object equal to the k 9e-,k2fc/+fbbz vg9+lln boinstantaneous velocity?

  A new car manufacturer advertises that their car can go "fpvdxxyag s)1h+-z;dx7 fd l20 rom zero to sixty in 8 shlxdsg;x)7x2+fp 0dv1 da -zy ". This is a description of

  An object moving in the +x axis experiences an acceleration or/q4k t g/p7vaf $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins 8p9f 9+b9pulb5apskuu l:x- kto slow down as it appru9skk9l uxl 8bpfpbp +u -:95aoaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car travfwb4q0f7 z1xweb8 sj0voq x ;l ,ufv/1eling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its v v4swz xq1 ufffb; xeo8q l/w,0b017jacceleration.

  Suppose that an object is moving with a constant velocity. h51pp,kto2 gmsd:tx 87e l)mo Make a statement concerning its ooep ms7k :lpd 1ht2mx,t58g )acceleration.

  If the velocity of an objec;)3j (c vlwkxfaimq(+ t is zero, does it mean that the acceleration is zero? Support your answer wit w (ijq)xv;l+k(3mfcah an example.

  Can an object's velocity change direction when its acceleration is cec xge kye,a)s(;m4r-onstant? Supp)x-er; ekyag(e s, cm4ort your answer with an example.

  Suppose that an objectxo/igtz q9 z2qw-mni: 5mx0m: is moving with constant acceleration. Make a statement concerning its mo- oi iztg9 :z20x5mxm/qnwmq :tion with respect to time.

  Can an object have incd5,4w z*xc ))o 3+enuw xdhbewreasing speed while its acceleration is decreasing? Support your answer with wdw*cz3+x5, unx4edh) o ebw)an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ieu5vyd2*9 r:tnm 5drzce. Make a statement con5uzyr5e: 9ddt2v *nrmcerning its acceleration.

  Under what condition is average velocity equal to the ave; 2kkei.z0x cerage of the object's initial and ek eix;cz0k.2 final velocity?

  Objects A and B both start at rest. They both accelerate at the same ratedash 3e.gci) g (q )m8nzt4+sq. However, object A acgq) hsse(dt gm8ai.) 4 qz3n+ccelerates 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 from rest. They both accelerate at the same rrpw5o wg z h5/*6mi1ovate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to thz pmw1/o*hrg 6 5iv5woat of object B?

  When an object is released from rest and falls in the absence of frictio*/u9zrief,) wlxfvv 9n, which of the following is trev9fzlix/*f) uv9 wr, ue concerning its motion?

  When an object is reg ,,7y nrjh)ibleased from rest and falls in the absence of friction, which of the following is true concerning its motbygji),n r7, hion?

  Suppose a ball is thrown straight up. Mak ck/czmj ep 8qrx-dxoyz(3)00e a statement about the velocity and the acceler -jc0dxrp(myqz3x oz0ec)/ 8k ation when the ball reaches the highest point.

  Suppose a ball is thrown straight up. Wh4(+zqc6axbwn )wq*r t at is its acceleration just before it reachen zb)t 4*qcwqr a(+x6ws its highest point?

  Suppose a ball is thrown straight up, reachez-n:llz i1zq)i mbyc p,-18yms a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going uimbqpl:n -m 1zyz- zc 18ly,)ip.

  A ball is thrown straight up, reaches a maximum height, then falls to*+p1vh.a o 7l:iu uxbu its initial height. Mavuua71.ip h *+: lxbuoke a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is th jp .t3+jgq-flrown downward in the absence of air resistance. Make a statement concej +fg.t3l-pj qrning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whfh er5in1)bt 9en she she reaches terminal velocity?rtnfi 9)h51be

  A ball is thrown vertically 0(a hitg(hu 3 qip+kfm0a.efs;c de17upward with a speed v. An identical 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 ball go than the firdeh(u if;fc q 30.a pk1+g m0t(ehia7sst ball?)

  Ball A is dropped from the top of a building. On o: nq:smfd7k1e second later, ball B is dropped from the same building. As time pqsmfd k7 o:1n:rogresses, the distance between them

  Ball A is dropped from the top of a building. One second .cp y5z buhw.2n*xjv1later, ball B is dropped from the same building. As time progre2ny 1*5zxvch pu.bj. wsses, the difference in their speeds

  Two objects are thrown from the top of a tall buildin+i au p4oztr8 409qiqag. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hitqq4 9apa+tr4iz0iu 8o the street?

  A brick is dropped from the top of a builjk yqmb, zv/n3h089zdding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Comparez jy3zqb0 ,8hnvk9m/d the accelerations of the two bricks.

  An object is moving with constant non-zero velocity f j6ja4q5*phjh2va: 2xydf i 7in the +x axis. The position versus timea 2va7 jj 6jx fqyhhfd5i4*2:p graph of this object is

  An object is moving with constanxfq j(x1 c:/ lj5zbjs72vl7x lt non-zero acceleration in the +x axis. The position versus time graph of tc2 j ljbvxq757sl lx1(f:xj/ zhis object is

  An object is moving with constant non-zero velocic4kl/ja3( v,q x f5bjxty in the +x axis. The velocity versus timef4 3/ k(j5 axlbcv,xqj graph of this object is

  An object is moving with constant non-zero acceleration in p0dhn*n7)a ku g- kmx2d9mp.qthe +x axis. The velocity versus time 0 2g ukh7d x a-n9.d*nmm)kpqpgraph of this object is

  The slope of a position versus tim re 1o9s5p ljbz64stz8eap.-y e graph gives

  The slope of a velocity versus t: (+5furiry puime graph gives

  The area under a curve in an acceleratio2dyc8drdvv,3x 6 un fxd j+g)+13 vefmn versus time graph gives

  The area under a curve in a velocity versus time graph givpor)d6 st 0jlk:6tv0 kes

  If the position versus time graph of an object is a horizontal line, the obb0d bw2e4h jki;-/bs n*chwn8tf 6k8cject hw88-sin *nc0/jf2 hbetb4k ;cwb k6dis

  If the position versus time graph of an object is cjwn2v3 zi30l a vertical line, the object islcj 02 i3z3vnw

  If the velocity versus time graph of an object iqao6*l 1-whz) umnbd0gjky 7xxw 8o /8s a horizontal line, the object hjl xxzn7 w1q6y8 dwkmb*g)0/ ouoa-8is

  If the velocity versus time graph of an object 5tiak m6qiy3x 95+y+rw,j6 9nfda rrr is a straight line making an angle of 30 degremrjq 659fyk 9aw5rix+ i+r6, trda3y nes with the time axis, the object is

  An object moves 15.0 m north and ,i((4s w)fjit ystnr-yb nr05then 11.0 m south. Find both the distance traveled and the magnitude of the displacement vecy-wi(4fts0)r 5sj n,nrb(yt itor.

  A boat can move at 30 km/h in still water. How long 0 gm4nz4j--8cqkql7a, qm.mx o c3cac will it take to move 12 km upstream in 74a-ca0.nmo c 3mqlx, ckzqgjqc4-8 m a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)n5 hces 7pdjy h*xfye45q /1egi,7)la

  What must be your avee,fr :g yzg0; f2wq)yfd 1zn-i1lhz/ wrage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon 1jcdn 6 jcah,rf v6,;j(approximately 42.0 km) in 2 hours and 57 min. What is the average s cfjd1 jr,j6, vhacn;6peed of the runner in m/s?

  A car travels 90 km/h. How longw:k hnj mq5:bhh: -u(o h/p:ze does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one yc vhr(9i7; zah1gqs4 qear. The speed of lsq 491rviahgczhq7 ( ;ight 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 straight road and you look k9v *-zm jvaq*oc 7k1vto the side for 4.0 s, how f aq mvk1vo z-*9vjc*7kar do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s,jh 9 -z6dh/vui your average velhi vuz/jd 6-9hocity is

  A polar bear starts at the Norj;dbi u;qkv y )ln4t12th 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 takdy ;4qb;k2 li)t nu1jves 45 min. What was the bear's average speed?

  A polar bear starts at t7fvr;b :e y3gyah 6s5uhvwv2(*) zqpnhe North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wes vv7(vh rzf5nyu;:ph 3gys6) qe*2b wat 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/h for 1jux* 6sl 0vwny9m.- nv10 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minu 9nnvxujl 0m*y-v.6ws tes. 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 tk7phfjey 9:sad81z f-vc. l m2he average speed of the motorist fo-a dlm9 jz vk.18p7hce2ff: ysr this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is.vw gu9e. jc xtah, p,x(t(9et up0*ws her average speedx( 09eujcvu.,w9a ,x.pps(*t htt weg for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nkzogge4cr7wy-+e8x e) 71 otxorth for 750 miles. Whateet 4roec -g1ozx wykg 87)7x+ is the average speed for the trip?

  In a 400-m relay race the anchorman (the person wh0n96nlvdqbh ) o 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 of theq06lnv) b hn9d race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 9 s. The car'ssjf2y 9u ni8o;0dsc8aj7y, xz average velocity during de ,;8da0ijz sx 9y7snoy2cjuf8celeration was 49 km/h. What was the car's deceleration while slowing down?

  An airplane increase-)st:+wp igl as its speed from 100 m/s to 160 m/s, at the average rate of +p :sa )ltgw-i$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h ad.z7+w8 xzfn of 3q/zhccelerates 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 rests+m4p0ot ,9ol2:z +sdb es vyyfy b:9t and 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 nkwic0v: (b)o lyk.dx(vi+w710 s. It then speeds up with a constant accelerationwvly7bnvk w:i di+) .ckx0o(( 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 7.1 m/s experiences a consta/0* chqu6 *s agknnv3o-ae(dpy 6:ayknt acceleration oouapasv -nqgyhk6**(e 0y ak/36dnc : f $1.0 \; m/s^2$. What is the cart's displacement during the first 6.4 s of its motion?

  A bullet moving horizontally to the right (;p29b o zxjsfgbvuz a.8((( gv )dtdb,+x direction) with a speed of 437 m/s strikes a sandbag and penetrates a distance of 42.79 cm. What is the average acceleration,(v(b,vd bd(ja8tbgs.f oz92z )guxp ; in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an ac 8gx9l/w6e4se ;oqba ;d3ter ircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acce;ow9rx;/ ede4tq6ea 38bl csg leration is constant, what is the length of the catapult?

  A car starting from rest c g wrep+7o:,+uvo/kasz3k 87j mb a*nmoves 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/snh4 x6 *u*zc *9tkmmeu in a distance of 200 m. What is its average accelerau*x94m ehu *tcnz m6*ktion?

  An object starts from rest and u6t:k v b6dwm*r6e 3tsqndergoes uniform acceleration. During the first e 3kqwb 6sr6tmvt*d:6 second it travels 4.4 m. How far will it travel during the third second?

  An object is moving in a straight linb(99im2p)mog syxv6o e with constant acceleration. Initially it is travelingom yx2ov9)b(9 6mgisp at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerate *:o(xz:snqe( ydz6b 4erb uw4s 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 b9hnza .;nj;ba 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 that has bec (w4sg3(eml wen waiting at the intersection starts ahead with 3 lg( s4ecw(wma 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 z do34z 3x90k*qosdm+ysz5l lof 12 m/s on the surface of planet X where the acceleration due to gra los m3xk5 sdy dqzzo+*l43z09vity 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 planet X wh1 i)vpzdej-e(ere thidve 1pj)-e(ze acceleration 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 wr2( tdft4(evl/saz h5ith a speed of 15 m/s on the surface of planet X where the acceleration due to4 tav5srl (tze(/2d fh 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 surface9 nk7kf fgh6x9 of planet X where the accelerat k6n9xgf97k hfion due to 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. If your frientbw:y2k (6zp yd holds a ruler between your fingers and releases it without warni6:(bzp 2tyykwng, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward abz a x * eiit)qe*k4)t/j1v2xgt a velocity of 19.6 m/s. What is its velocity after 3.g*e*bj1ax )tz4/ eiit 2xk)qv 00 s?

  A bullet shot straight up returns to its starting point in 5 s. What is the in4;rqfwh -+fwer+m vi +. o(hqwitial speed o qwrfe ++qhmif ;wv+4h-o.(rwf the bullet?

  A ball is thrown straight up with a speed of 36.0 m/vldx/g.le (6w s. How long does it take to return to its startingve .6(lwg/ xdl point?

  A ball is thrown downward from the top of a building with a0p,wpr*y.a t mbaxih 9t28d.dn initial speed of 25 m/d ahtdiyp0t wb.ra2p., 9m8*xs. It strikes the ground after 1.3 s. How high is the building?

  A ball is thrown straight up with a.kjrt g-.ig4jo8qd :t,sphj1l v3-vs speed of 30 m/s. (only fill in numerical value in the :skj q-s p8 tg3vh1,jrd-o l.4.tjgi vblanks)
(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 thq:/p duo 54u jy6f wqnidud;pb.8,ar;e air with a speed of 36.7 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the ve75y/y qt+lz8*cgqhz j locity at t = 1.0 s?

  In Fig. below, what is the velocity at t =vrxh;3t qk7r , 2.5 s?

  In Fig. below, what is the veloc(e/m7nik 1l*g 2czitk 7:cy up-pwq9bity at t = 4.0 s?

  In Fig. below, what is the velocityesc+ dkx*gubt: , wn3v3n-p2 h at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?;c : hglf vmn:t3z0hc2

  In Fig. below, what is the average veloqjnw+k1;2 ,r-osik 8wuza;flzyr ; ,f city from 0 to 6.0 s?

  In Fig. below, what is9q4o03)p; pd ykso +jpj4kquf the acceleration at 1.0 s?

  In Fig. below, what is the acceleratio/islf4 uo7n/dvp. uhd4dj7- hn at 3.0 s?

  In Fig. below, what is thinki 57/p fw ryrj-0q3e average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0e2 m (7br9rhfm to 8.0 s?

  In Fig. below, what is bwln5u0i hj2 8the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, veloci y0r r7/sg )wx3ps,ktmty? {speed|velocity}

  An object can have a varying speed ifu((ep cs4qx/(cyk(b h its velocity is constant.

  The velocity of an object can be negative when its acceleration84j tb v ;msbo .zq+do 9n25ln,hsqx7y is positive.

  If one object has a l3+n 15wbq z 54i7zpbabps(r egreater speed than a second object, the first must have a greatzbzbn7lw+p er 1pasq3 (5i54ber acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed of rt5tn b77 um;j$60 \; km/h$ 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 decos 8mi0 b 38.2i6nl8hridqodr reases.

  A baseball player hits a foul ball straight up into thiq*3ati71sm9ol o f vf dc(g/;e air. It leaves the bat with a speed*og tvfii1mqadl / so(f39;c7 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 tz1v-z qmx9uq9w, qg:iq3 l- wko its acceleration, how does it change if a,lzu kqizx-91 3g -: wwqqvmq9ir friction is ignored?

  As a freely falling object speedwrqs l q o103+vz.fg:bs up, what is happening to its acceleration, how does it change if air frifrbq: qv 1g0w+.l3 sozction CAN NOT be ignored?

  An object that is thrown vertically upward will return to itsr 64u(n(s dpnn original position with the same speed as it had initially if air resistance is (r6s4( npdnn unegligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and h k6ei:4(np -zix.yfzekto poh 3 1g73nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at 2w x6x: upreeonk0b;m .4sz7l4zg ur)the same time.

  An elevator moving from the second floor to the fifth flx ui*eamfg r)7. /ln3ntrk+:loor making no stops along the way has zero acceleration all the timeni m/t:73 *x llr+gkf.)a neur.

  A rolling ball moves fromjr6bu j + 0ieyb22s c+bob;;jx $x_1=1.7 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. 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 $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completez+* istnlwf:1 n:lp/d 2fcqq 2 laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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 straigha jdb3p;7k-qtda 9 j0kt line, moving 101 m away in 12.8 s. It then turns abruj37kdpbq;0-akda j 9 tptly 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 fr:km7zlifer6j 7z dx+1om $12 \; m/s$ to $23 \; m/s$ in 5.8 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 from8x xxnblrtx82bc w5humd pt1 /i:4/f9 $21 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a skjg0h ir ;7x:opeed of $29 \; m/s$ 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 to essent :xnougs7a,ze iw4qk:0:ft f5 ially top speed aboui: 4e fksg:,zf7un0xoa: t 5wqt $11.4 \; m/s$ in the first 15.0 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 uni n)z gf*clm)v*rj,5jkformly from a speed of $21 \; m/s$ to rest in 4.67 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 hic,jghp1tir-1 k64 mb mghway. Assuming imt ph gj4 mc,rb-61k1a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going ha4m zgzn4m:bn ,9v) +nprap36e 5qjw$25 \; m/s$ 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 10,000-g2w+i h3tvv2v023a-ovyba lj, )1bfpftl0 sjm run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. h32vlyvjbv2t 0j- v3, a2wf l01sgtfbao ip+)The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$