Suppose that an object travels from one point in spp(fa(5hej 0akuxt-a/ / .ofle ace to another. Make a comparison between the displacemeh0(txu-jo.a/effaape5 (/l k nt and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velociut./fx 6yh vb7ty?

  A new car manufacturer advertises that their car can go "from zero to sixty mwl5o) i* dyj/in 8 s". This is a descriptionoy5w*dimj l )/ of

  An object moving in the +x axis experiences an accx5g+odvj q7z u1 ew7+aeleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the 2p x, p z2ueytii(z/w:3biy h;East (+x direction) begins to slow down as it approaches a traffic light. Make a statemen (i2te:zy3hbiip ,ypwu2/; zxt concerning its acceleration.

  Suppose that a car traveling to the Wjqwx unq z*tu6-6j//b est (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratizjj w-/q6u/t6uxnq* bon.

  Suppose that an object is moving with a constant velocit0;mulrz b3f0n-xok)2.ijps/ o ztb8u .2clejy. Make a statement concerning it 22u.b;)rjl /8e0 xlp tk zjnf i3o.z0m-sbocus acceleration.

  If the velocity of an object is zero, does it mean that thc q0bzthu 0 5mepc c6f*pi3y+7e acceleration is zero? Suppohtmp c63z+ecqu705c *yifbp 0rt your answer with an example.

  Can an object's velocity change 5 n;e oip2ebhccx49e2 direction when its acceleration is constant? Suppore92phe c45ox ;n2 ceibt your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statement z ttn k 7mlf/uo3;t2j2concerning its motion with respect lfom7;tjk/ 3tnzu 22t to time.

  Can an object have increasing speed while its acceleration is decroj0jm 7fe mr5upoyi( 5i6zay6r42m.6bg 1sw deasing? Support y0j sygi w omibz7d.(m puj1a6ror5m6 5e6yf42our answer with an example.

  Suppose a can, after an initial kick, moves up along a smoo. b 9qg.i6w6qlewwfk0th hill of ice. Make a statement concerniq.9l be wqikw0.f w6g6ng its acceleration.

  Under what condition is average velocity equal to the average of the object's iux +fw 6o/nb-l2 qqfh4nilq 64n+bqof 2 -uhf/xwtial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. aulsu4.e 6vl3 However, object A accelerates for twice the time as object B. What is the final speed of obje 46u3sua ll.evct A compared to that of object B?

  Objects A and B both start from of:9w6*hx 5- jc:aeqq2 gc qcorest. They both accelerate at the same rate. However, object A accelerates for twice the time as object Bwj69co-:5h2:qfcgo x *qe aq c. 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 absence of friction,e2 cy4d66uh rb which c266 he4rydbuof the following is true concerning its motion?

  When an object is released from rest and falls in the absence of som*m o/hf0;9mgfm bxfju o -.px5.:t friction, which of the following is true cojo;g -fu.fto 9bmxo hpxsm m/5m:f0.*ncerning its motion?

  Suppose a ball is thrown straiga-fh6/ dl2wbxqno l4,ht up. Make a statement about the velocity and the acceleration when the ball reaches the highest -,doal2/6blx nhwf4 qpoint.

  Suppose a ball is thrown straight up. What 1i/kvmcdamzb(8k38r-cc ll6 is its acceleration just before it reaches its highest poin3-m6lrd1iam l 8kb/ck(c czv8t?

  Suppose a ball is thrown straight up, reaches a maxima)2bab,hh nxz) iryv:x,m)a /p3f)uium height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as thhxiu/3i b h a,m )av2)yx)p,b:za)frne ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its j;0 cparuicm 3c6(p8jinitial height. Make a statement about the direction of the velocju 8am3rp (0c j;6cicpity and acceleration as the ball is coming down.

  Suppose a ball is thrown downwax hq d36gb..msu;wmv6rd in the absence of air resistance. Make a statement concerning its ax;qbvhgw.s 6 .6mu m3dcceleration.

  Suppose a skydiver jumps gp6rlw ;0 fpa534arc1nbe6i d from a high-flying plane. What is her acceleration when she she reacplr54fapc;a6en g 1rd3wbi6 0 hes terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical sec :)r uedfp*wg8ond 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 theur8wgp:)* f de first ball?)

  Ball A is dropped from the top of a building. One second later, 6z6 7rc:bl2byhsaou7 ball B is dropped from the sa2y:r6bs7hzcubl 6o7ame building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One sxzxpws.0mq s t *lou5;1 jn(x.econd later, ball B is dropped from the same building. As time progre5t 1w pj*0xnqxu.(;x.ss m lzosses, the difference in their speeds

  Two objects are thrown fro14oukqrjc .dvg:( pa/j+9twfm the top of a tall building. One is thrown up, and the other is thrown down, both with the same inirp4q./vdc(f9o +awk :t1gujj tial speed. What are their speeds when they hit the street?

  A brick is dropped from tvvdl -,*rka* 2yx k+hahe top of a building. A second brick is thrown straight down from the a*rl+ka*d,2xvy-hvk 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 non-zero velocity in the7y hzdtm9 h5/e8(carpvq u ;e5 +x axis. The position versus time graph of this objecea;58me5h/c7tpd9y hz vqu(rt is

  An object is moving with constant non-zero acceleration in the +x axunu+c up46 68titvc6d4nie)t is. The position versusid4)it v cn66et u86+tunpc u4 time graph of this object is

  An object is moving with constant non-zer nwp xu18t-uhyvg,b)08bi*g xo velocity in the +x axis. The velocity versus tgiv- pbug *uyxx,0 1t)hw8bn8ime graph of this object is

  An object is moving with constant non-zero acceleration in the +xhd:dwv7v4 -+hsem u(d axis. The velocity versus time graph of thi(dweu- mv4+dh:dh sv 7s object is

  The slope of a position versus time graph givedf/c/g4d:( e af- seppn.;jjrs

  The slope of a velocity versus time gpe6m g2 9h)ss0aud6efraph gives

  The area under a curve in an acceleration versus time graph givds:w ;i z ez7ah mt488+y3uarw)d fvg9es

  The area under a curve in a velocityla/sgd 59o0ho;7 fyew versus time graph gives

  If the position versus time graph of an objgupw sg1zk()d-uco ) rm(bj54ect is a horizontal line, the object is(crzbkp mwd4sgo)u() g-1 5ju

  If the position versus time graph of an obn830rs 1--mc 2vaeouyv uwyi8 ject is a vertical line, the object isaeiuw 3v0 1mr8ov-82c y-nus y

  If the velocity versus time graph of an object is a horizonw,rj/ur 2t1jutal line, the object isujt/jr,1r2 w u

  If the velocity versbe+(-j ,ph f6s dd7zgrus time graph of an object is a straight line making an angle of 30 degr6be 7dg-dh+jf,(s zprees with the time axis, the object is

  An object moves 15.0 m north awfybf; a5l4pbv;( 9mz90h o tsnd then 11.0 m south. Find both the distance traveled and the magnitude oha 9b sw9l;;05 f4fztp(vmboyf the displacement vector.

  A boat can move at 30 km/h in still wfb 7b/1p*tozx .-mg tdater. How long will it take to move 12 km upstream in a river flowi *bzb.-odg 1t/7 txpmfng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = vx( y)/ianymxvi(44e *u pq 7o1609 m)

  What must be your averagh64nsy :bm j*we speed in order to travel 350 km in 5.15 h?

  A runner ran the maramr7 5zgyxat:dnh:5a / thon (approximately 42.0 km) in 2 hours and 57 min. What is the average s5yng5 x a/ha:dm7rtz:peed of the runner in m/s?

  A car travels 90 km/h. How long does 6 ie/2o2uxjy xuh)m+qit take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speedy i ac u*eg.,:eh5m w78u4trtt of light, e m t:4ute 5whiat8*7yu.gcr 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 to th9aixelu++hs4qi c)81s 4rud ge side for 4.0 s ec1 assqgu )rxd+i89+h4uli4, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your ave )im4 ey.1m+duoxiox+rage velocity uooi )+.d4mm1xi y+xeis

  A polar bear starts at the North Pole. It travels 1.0 km south, then*1t mn0hkzx39(z au ,m6xae a.tk8tgw 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. t6t3ha(xk az*tn zak 1,wgxme 9.mu08 This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North P hlxduvs8mz x0,q/phf -m1c/1sci 16vole. 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 tq svfmx,mci/zpuhx0s 1h/dv1c8 -16l akes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. Ig4pd 9rz,a4lna5 tt.n t 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 from schot,drznn9gtpl4 .4a5 aol?

  A motorist travels 160 km at 80 km/h and 160 r6.1 4anoa :hpyc7ccqkm at 100 km/h. What is the average speed of the motorist for this t 7ynp orc6:.4cqchaa1rip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h awfg o1ej,r/ q,t 100 km/h. What is her average speed o, e1gjfw ,rq/for the trip?

  An airplane travels at 30pxcw*fv0 o;+ wt ;a;vu(c3smz 0 mi/h south for 2.00 h and then at 250 mi/h north for 750uwm;tpz0vv +c w(*s;; fco3a x miles. What is the average speed for the trip?

  In a 400-m relay race the ancho-at 2c ;by-v8mm7v ayvrman (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 of the race, in order that the team A runner not lose the race? aamy yvtv 8b;-vc72m-

  A car decelerates uniforj0 ,n+pugcl(im1-j fzakt 5c g4az88nmly and comes to a stop after 9 s. The car's average velocity during deceleration was 8aj8+ zazg0jfu5 1 n-tcnpcm 4(iglk,30 km/h. What was the car's deceleration while slowing down?

  An airplane increases/ 2;ogi3 bhznn its speed from 100 m/s to 160 m/s, at the average rate of nz2ib;o3gh /n$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rak *y6wqpakwioj e/x3m m-3v71 te 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 accelerateu f+)5a d3xenvs 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 with a g2p;8sy cl hm(constant accelerations(2;lphc8 y gm 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 7.2 m/s experiences a constant acce5 kexgj qy/wbugex :5v3*(p t.leration ovgpxw eq.b:ke (gt53j5 x*u/yf $1.3 \; m/s^2$. What is the cart's displacement during the first 7.9 s of its motion?

  A bullet moving horizontas17 fl-i 8 kcza(asn-klly to the right (+x direction) with a speed of 220 m/s strikes a sandbag and penetrates a distance of 33.22 cm. What is the average accelerationksz caf7ksln-1- 8( ai, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraf teqie59rq9w,yn(eg44 p2o qot 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 length of thoqtn2449 p5 reio w( yqge9,qee catapult?

  A car starting from rest wmvo() tmqq+t xo r79,kktswl6: 3x w5moves 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 6s,kifhgnz,mh764ou is its average acceleratiou,zsk7 gh46in,hm6 fon?

  An object starts from rest and undergoes uniform ac86f tmd;jojd: celeration. During the first 6m j:ddo;j 8ftsecond it travels 6.4 m. How far will it travel during the third second?

  An object is moving in a straight line with conf/remwl*g 2j5 stant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. 2 rfj*5mle/gwHow far does it move during this time?

  A car starts from rest and accefk/5 l4ixqp1nw20ojvohv 1w1 lerates 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 decf;zyqo w;3b5 v8 3ek( yauu7crelerate 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 griq780/r)o peph m ;ar7rgx vb/een, a car that has been waiting at the inters;x7/ qmhr7i0p/ver obrg a) 8pection 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 of 12 m/s on the surface oer f (k8sp xsq21pl k23cos,)kf planet X where the acceleration due pslfpk( cq283 ksx,1se2ok)r 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 planet X w0a3n k+sxri) ihere the acceli3xiksr)na 0 +eration 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 speed of 15 m/s on the surface of mc43 59isj;soljfjvfo1d8gd ,s -4x oplanet X where the accelerationsm o3d;j 4ioxo4v1 f 5jsjgf,8-ld cs9 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 up*ufi3voxo v6-+us n(75fk 4dd 7dx erxward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity iux s(+5drei 3*-67xnvxf7doofv k4du s $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually gv /qy(qy43it9hjjm l70wlyq -reater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far /j9 q30tj7y vq liy4wl q-m(yhcan you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What i -r pait6fmp )326vrdrs its velocity after 3.00 sr6 fdp3r-m6tria)2p v?

  A bullet shot straight up returns to its starting point izn0.1 pi b 3vt3yyi)oqn 9 s. What is the initial speed o10b vpzty.n o3y)i i3qf the bullet?

  A ball is thrown straight up with a sp t /aa5qn4z5qq*iv/.6l y0o6n eg1o x+vqniibeed of 36.0 m/s. How long does it take to return to its 6zyniexi0 o 4q/obt5nl i *qva1n/qgvq56+a.starting point?

  A ball is thrown downward from zw. 0-p (xzfpoc f(.amthe top of a building with an initial speed of 8 m/s. It strikes the ground after 3.0 s. How high is the buzf(p zw-xa 0o..f (cmpilding?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numer:n38q:c7xish 1vlz* y l 10kspkpf)z eical value in: lf8svszek3c h:q7)pzy0k1n1 p*xli 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 aeeh*7j:2kht r/ bmw( dir with a speed of 34.1 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 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 velocity at t = 1:4za+kfhhn6 b7 sz dwv *65yum.0 s?

  In Fig. below, what is the velocitd6xs79g bswog;u0fg 5y at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s? w*-qhdsu)c- l

  In Fig. below, what is the velocity at t-zy9wy x;p/tlasn .6f = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s? -hg)vc r7mod8m df8;e

  In Fig. below, what is the average velocity from 00 -qpjs+*2 eghar18 de-yozym4x n sm2 to 6.0 s?

  In Fig. below, what is the acceleration ebuqjw6/ - r9i1v5t fp9e/hba at 1.0 s?

  In Fig. below, what is the accelerat524uogqs:3t /xqh*snefae 2 cion at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to w+/npkex5l 3m5.0 s?

  In Fig. below, what is the average acceleration from 0xp/up 6bn4h28pmj (vz to 8.0 s?

  In Fig. below, what is the displacement from 0 tv71vcfl h84t xo 8.0 s?

Does a car speedometer measure sr96h aa 9ebsn4peed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is vdxhki42hlt o u65:45wk-1fy tb: au,nnc8a aconstant.

  The velocity of an object can be n0yc2v f5 zg;1 45c otv )rkjqe1abzf(eegative when its acceleration is positive.

  If one object has a greater speed than a secon/ y f4cg,srevuk85w;p h*imox+6 wf6c7 vi;wtd object, the first must have a greater ac 7gxh,4;fcr56v 8s t iim6opw+yeckwuw ;v*f/celeration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speeewu66 i8th.wu0-lae j d 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 accelxh0jef-u9d f ;/m )kh8po db :+ajpda1eration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the b g2+ch v;w-k9lxuuqau p9:h0jat with a speed :auhxu0c 2j q9 -lp v+h9;gkwuof $120 \; km/h$. 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 2by skzf *5eg(is happening to its acceleration, how does it change if a2sfgze* b(k y5ir friction is ignored?

  As a freely falling object speeds up, what is happening to its acyh:0 (/0czc)l tvsv sh5/uh z7xabtp.celeration, how does it chang 0:vcshy7sz /h tht.zlcvbx au)5(p0/e if air friction CAN NOT be ignored?

  An object that is thrown veryw mcbqvr1fp8y0 -xn:zn 5by6+ u5 5ogtically upward will return to its original position with the same speed as it had initially if air resistance r 1:by pfw60xc8gn5nv +yz55qu-ymbo is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero a2ijvgl9ghosoy6-d. w/50n yv cceleration at the same time.

  An object can have nonz v a ,c4+oyc.uqla1ob6ero velocity and zero acceleration at the same time.

  An elevator moving from the sew6j;g: b( 9y*7nyn9wc*p 2a fiphg sqncond floor to the fifth floor making no stops along the way has zero acceleration all the time.gw yfwyn7is2: *p 9anb9(6jnh*pc q;g

  A rolling ball moves frfl: b ,l8it)wdom $x_1=3.1 \mathrm{~cm}$ to $x_2=-4.8 \mathrm{~cm}$ during the time from $t_1=2.8 \mathrm{~s}$ 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 $t_1=-2.1 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quar 2xh,- 9).httkwx:tb9 ioqa3rhpt t x0ter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.4 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+eywt32lwczj -nf :p- straight line, moving 95 m away in 9.0 s. It then2y-wtwefz :jn-l3c p+ turns abruptly and gallops halfway back in 4.6 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 from hj) irsd yqlgs:ov*)2u yl8*9$11 \; m/s$ to $23 \; m/s$ in 4.2 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 b z/w0wak6/vlv.o+m ,myz /0*z tm npc$18 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach al j;x c)3xasvror9)t8 speed of $30 \; m/s$ 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 essentially top sp vv5s y68eb4jweed about 5ebsw v4 8jyv6$10.3 \; m/s$ in the first 13.8 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 uniformx3c4g-h:mkv9ve8 o-+jglow dly from a speed of $20 \; m/s$ to rest in 4.34 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, jczp45(lun p2 )gr4uek5dn5 g9 vxg.xa car leaves skid marks 92 m long on the highway. Assuming a deceleratgn ug4pd5vx rnze5x 4)k5p(j 9.lg uc2ion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go 21;ocfpg*yb fing $25 \; m/s$ 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-m run in less than 30.0 mry n1 czv(;kn(:panp2:m4 fc cin. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate 2 m4ar::;zypc(fc(1 k nvncpn at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$