Suppose that an object travels fk:wr wx( k7bsx j-4am0rom one point in space to another. Make a comparison between the displacement and the distwwmk 4:0k xaj-x(7br sance traveled.

  When is the average velocity of an object equal to the inoys4a7wf:)arvmino/ 3wqshs t 6-a44stantaneous velocity?

  A new car manufacturer advertises that theirg6b9.q 8etz ye( -+)kgs ug licq3m*qq car can go "from zero to sixty in 8 s". This is a descriptioq8qzul + )c6(-bmeei*kqg sqg39g .t yn of

  An object moving in the +x axis experiences an4yyf5s3b)c xph t.l;p acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slo u1r d .tht8ruzn)j(8nw down as it approaches a traffic light. Make a stauntn 8 .j8)hrr zd1(uttement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begu a2q :)ntmkx v),fzk: ezj+ fr:fe.3rins to slow down as it approaches a traffic light. Make a statementa+f:eu e)f: xv.2:)mq jrnkzr,tfkz3 concerning its acceleration.

  Suppose that an object is m;4w f;tyk-zjgw aess0:*5yh foving with a constant velocity. Make a statement concerning its acc- *y wjwesz;ths ak;0:5 4fgyfeleration.

  If the velocity of an object is zero, does it meanddhy-i9k.w5xv*aoe f k :pb(qt*57wt that the acceleration is zero? Support y iq5wbty*xvph *5oe-kakdfwd.t9 : (7our answer with an example.

  Can an object's velocity change direction when its acceleratpzer ts23 asq1+ r5(-jxil1 mkion is constant? Support your answer with an eximrt+5q1k3xzsla2j1p er s -(ample.

  Suppose that an object is moving with cons v h4f:r)rk r u0.s290rbxmh lbym)10x2 gkiqjtant acceleration. Make a statement concerning its motion wb92vi rk:m)x0xy. g hkbl2rrr 4m )j0f0u1sh qith respect to time.

  Can an object have increasing speed while its acceleration is ; f+ vs- zif6cgh20ghzdecreasing? Support your answer w c-0+6fzh 2hfsg;vgz iith an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Mak0+xaene2b awm z-k4 52gmpn/7qtw :u de a statement concernin 5a2+0n gd2-uwk eaebnp4/q xmwmz7t:g its acceleration.

  Under what condition is average velocity equ()l8x g+oao xgh *uuca d9h:3val to the average of the object's initialx*luaud8vx cgo) +( :3hoh9ag and final velocity?

  Objects A and B both start at rest. They both accelerateoo3qqv(00zy ybjcg v k):, 5e(j-cfc y at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to0 0v3oq(b)y5qv o c(:jyz,ke ygcj-fc that of object B?

  Objects A and B both start . x.ubwvoj1. ox/s0g7ifb so;from rest. They both accelerate at the same rate. However, object A accelerates for twice the time xji ob7w0;1v o.sg./fbxu os. 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 falls in the absence of fri w +k 5)qq,u wbpw jnn8okxl;;0vz2; by;hr.gkction, which of thy+ xb g;zw.5r)wwnuk2qhk pvjkq;;;o ,bl n80e following is true concerning its motion?

  When an object is released from rest and fa vo u j2(9 /bu0:4acnui;moyhylls in the absence of friction, which of the following uy2b /u:omuc (vj9hay0 ni;4ois true concerning its motion?

  Suppose a ball is thrxbr5g;e-zjldfk,5k+1by .intj7 v93;new svown straight up. Make a statement about the velocity and 7vje , w;x+v gj;tis 5knlzrfb3k-ye9bd5n 1.the acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up h/c7jxe+ail2mm .i bi1ao s60. What is its acceleration just before it reaches its him+hbiaojs1 acii70m62ex. /l ghest point?

  Suppose a ball is thrown straight up, reaches a heop3x0ifhd- c36 lf9 maximum height, then falls to its initial height. Make a statement about the direction of the velocity and36f-3xhfie 9dlhoc 0p acceleration as the ball is going up.

  A ball is thrown straight up, reaches l b0u yed0;+oaa maximum height, then falls to its initial height. Make a statement about0 obdu0aly;e+ the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make asg4e5xi. ty5y u)ho-n statement consny yhit) e 45uxg-o.5cerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. kgf4cg:-idqwm--3ib What is her acceleration wheg-ci:-- g f mbkdqw43in she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. Angwj1o0lrfjl0( x sn-: 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 0jwfs-lgx( 1nor lj0: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 lat20p p 0hkwwsn;er, ball B is dropped from the same building. As time progresses, the distance between themhpkws;wp00 2n

  Ball A is dropped from the top of alo.eaf s84b5j building. One second later, ball B is dropped from th4. af5bseo 8jle same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tallp n4ay0d +kk2l building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when t2kk40 lypand+hey hit the street?

  A brick is dropped from the top of a building.:hjk2po+sd34aadmx bazx2z-- y1 c.b A second brick is thrown straight down from the same building. They are releaszx+ayb akd -cobm43sp:-2 zj1d2a.xhed at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in v07llts6 2:zooh7s( q0viy uwthe +x axis. The position versus timei:2l q6 usvwy07svlhzo7t 0(o graph of this object is

  An object is moving wit+f.+gmk a +y:v vurt+wh constant non-zero acceleration in the +x axis. The position m.+rv + twguy+:kv+faversus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocsc1 fpm htu9+tm67ze) ity versus time graph of t zeu1tht+)6f sm9 7mpchis object is

  An object is moving with constant non-zero acceleration in thatk-wr*j p5 l/e +x axis. The velocity versus time graph otjk5apr *l-w/ f this object is

  The slope of a positrt,oh hjv.l;z6yw w:dt* 2qduu u)6b ,rqr/6l ion versus time graph gives

  The slope of a velocity versus time gra05f h/kg n939wxu(kv 0lhodt oph gives

  The area under a curve in an aca-qu++(zks ctceleration versus time graph gives

  The area under a curve in a velocity versus tvc/j/ -5;vjggjvmu) 7 g mv8 upsa6;vjime graph gives

  If the position versus ti,::z:6bdizre 6zutp qme graph of an object is a horizontal line, the object isetr6:ui, qp:bz6z:d z

  If the position versus time graph of an o)jct h7jzwx/- bject is a vertical line, the object iswzxcj/- )tj7h

  If the velocity versus time graph of h o o9kpqq )kx( 0qiy6zdr5-m 3y8cor-h8o ll/an object is a horizontal line, the object h-k/oqdm3 rx8-(0i py hko859ycqlr)ool 6z qis

  If the velocity versus time graph of an object is a straight line makingnm8b5 cv9q+th pnq/p4 an angle of 30 d9q4tph q c8mnv+5np/b egrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dis8/k +z7a26g:ou c4xdklhtikyh lcaq5: c 1+zntance traveled and the magnitude of thnyg7k 1hd kqhlx4l+k6 oz:c:z5 ct2+ica u /8ae displacement vector.

  A boat can move at 30 km/h in still wab2;ya9 p/i;xrsw0e + wafm;a lter. How long will it take to move 12 km upstream in a rivi /yewrb0;a2; +xa9s awfm;pler flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =6v/q i+foqo+ y 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 h qg)qsuulf-5*10 c zn8nsx; jt?

  A runner ran the marathon pb7f k :kw qq;6ala81x3ythdx7*b5mu(approximately 42.0 km) in 2 hours and 57 min. What is the avk lbdx3hqam5pk1: q *wb76 xtf8uy;a7erage speed of the runner in m/s?

  A car travels 90 km/hbbheql +lq /3 0+n8* *tj/qj v0niwxvf. How long does it take for it to travel 400 km?

  A ly (light year) is the di,.xf 2m .6n u8cnvcsc-dblt5; 2hy xuastance that light travels in one year. The speed of light is f.x6x.22usm,l;b c ucy 8hna d5tnvc- $3.00 \times 10^8 \; m/s$. 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 the sh6myb* a*zln/4cgj;z.wcn r + e+)l exide for 4.0 s, how fcgzxrjm/ yle+ ;*w +z)nnah*l.4bce6 ar do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, ys nkuo+x not4h +(5y+sour average velon+k o (h+t5uy+s 4nosxcity is

  A polar bear starts at the Norfi*r xg xn6e5.th 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 takes 45 min. What was the bear's average speedife6ng*.x5 xr ?

  A polar bear starts at the North Pole. It travelsaeuz/t* vb almwc7r1uhj4 ) ,(5nl8vd 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 takes 45 min. What was the bear'uu45l()7r/z1vwd,v j lhebm c*8 aatns average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 mile1 ph-jvd:sf 5yn5 q;jgs. It then starts to snow and you slow to 35 mi/h. You ad:fyh-gn5vj 5q ;ps1jrrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 kmea zdubi3v1-.rnk w4-3g* xuq at 80 km/h and 160 km at 100 km/h. What is the averagdx4 gw * b3uzu kaiv.-qr3n-e1e speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h aneulud4)-re 7rd 2.0 h at 100 km/h. What is her average speed for th l 7edu)r4-uree trip?

  An airplane travels at 300 mi/h south fo+ma9*6vgb-yu ed -8r+gqeu gpr 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the t*9d--my+qgaevg 6p eb8gru u +rip?

  In a 400-m relay race the anchorman (the person who runs the lacx3)7 zhnmt7ec) /fks4ne k5 est 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 tefn 4z3cc)e m xke7kn/s5t)h7he final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a snima z2hc8n:;top after 9 s. The car's average velocity during deceleration was 61 km/h. Wh:n mz2a ;hinc8at was the car's deceleration while slowing down?

  An airplane increases its h gqxaed8.4559t8 xhoc4nnv so h23vsspeed from 100 m/s to 160 m/s, at the average rate of s 48qnv hgc 5nes vt4o83xoa29h5hxd.$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atav:nl.ztfh2h/a t4 p73,1rp 2hlq shn 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 axtvx ;,s6ic *xnd 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 10 rv+ue /as,3ba s. It then speeds up with a constant acceleration 3a+srvu ea b,/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 2.7 m/s experiences a constant acceleration br8xwmgdmwjuqpx a.6364 /gk1wt3+ p ojw/ x4 3pb6wmpkg d8.t16wxm3u+rqagf $3.6 \; m/s^2$. What is the cart's displacement during the first 8.4 s of its motion?

  A bullet moving horizontally to n fxz wn1+v+n1the right (+x direction) with a speed of 490 m/s strikes a sandbag and x 1z+fnw+nvn1penetrates a distance of 24.39 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraf2/xab/ ;nct: 0ovxu sut carrier. It reaches a spee/ t/ v2c unu;:saxbxo0d 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 the catapult?

  A car starting from rest moves with constant ps 9 ,o4.(dlczs(gcvzacceleration 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. Whatjobgvz* w vy,l4a .g8j.7lwf5 is its average acceleration?g4j 5y ,vv8l gz*fj.obawwl.7

  An object starts from rgt:cnv;q -j8 :4vkicnest and undergoes uniform acceleration. During the first secv4-cn8 qt; i:kjcnv:g ond it travels 2.5 m. How far will it travel during the third second?

  An object is moving in a straight line withhj6k mze/.f737hwfff /2i guk constant acceleration. Initially it is traveling at 16 m/s. i f u/z6./jke7fmfkhfg23wh7 Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest andt6;pf v khz**hucyo;1w8z cfg n( td0) 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 dry road can men6rlk9 * qp.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 thau yo5s6cp4ubb+*fz6x3-6b ad ;vq lqgt has been waiting at the intersection starts ahead with a 34ubx v ;bl6+6 gpo qac6s5dz-y*f ubqconstant 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 w tvj(8pz:oyq2 ith a speed of 12 m/s on the surface of planet X where the acceleration due tvozp8j q(2 :yto gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed o)pk: o7cwb+81w ti m dfhh68hlf 12 m/s on the surface of planet X where the accelerati7wtip m8 w h:)d8hl1c6okb +fhon 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 z57wsy2hvq.dg qmz 8.yb *pis5 s5 c5pm/s on the surface of planet X where the acceleration due to gravzhsvpmi8gd2b z pyq755 5. .s w*q5cysity 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 spkc2t2( wx;g/ )b )r4uae touvseed of 14 m/s on the surface of planet X where the accelerationg ;x utv4b2/ csoart)ek)w(2u 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 68 pc0lqwqhl6your friend holds a ruler between your fingers and releases it without warning, how far can you expect 0wh6 lqq 6l8cpthe ruler to fall before you catch it?

  A ball is thrown upward at a velocity ofw.vebizh uv4 6qyx :8xes/(k6 19.6 m/s. What is its velocity after 3.00 e8x wus:4(e.ybxzhi qk6v6v/ s?

  A bullet shot straigfy 4ta )omp9c+ /.nabc4zs pk:ht up returns to its starting point in 12 s. What is the initica o9p acp. yt)zs+b kn:f/4m4al speed of the bullet?

  A ball is thrown straight up with77ulxoc5zv l78c-c fh a speed of 36.0 m/s. How long does it take to return to its 7 x7c8vl -57lc chuozfstarting point?

  A ball is thrown downward from the top of a building with an initial speed of 27up xp6h;rs1:g m/s. It strikes the ground after 2.4 s. How hpr6 x1sguhp ;:igh is the building?

  A ball is thrown straight up with a speed of 30 mfl( +n hqni/ees 3/x5i/s. (only fill in numerical value in the blanksn/qf eh35isxi(/ ln +e)
(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 speedzwm( 2z8splf. of 28.8 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 = 1rwf7xq((l h mo3j +sf)u640scff wm;s.0 s?

  In Fig. below, what is the veloc*ks,jf+p4k wkdc7j/pj ah*d6 ity at t = 2.5 s?

  In Fig. below, what is thhbcr1y e2b 3zfz 014jifqw 5.ke velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t =ryj.fj05u st( p)op8jjiieu1f 3 w. )z 5.5 s?

  In Fig. below, what is the average velocity from 0 to gww8vnr:hinfe):r u*1l8 .qz 4.0 s?

  In Fig. below, what is the averagexnch;f ).br1s9j f 4ad:jexllz 2x;b, velocity from 0 to 6.0 s?

  In Fig. below, what is the accecqdq .a)g;uc 6k-ruo: leration at 1.0 s?

  In Fig. below, what is tr x4n /isoar7l5j7o5s he acceleration at 3.0 s?

  In Fig. below, what is the average n ukq 6p mno+p70-tzv5acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleratio.c.mg;kuvy 9fn from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0uiq c*1t26ipw3qgs(g cp)7mj to 8.0 s?

Does a car speedometer k9(vky :*y02 1yc1byqru.idj,la bqh measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is consdviv g m sigiw(e3*), e30ii-+hguh def5/t g3tant.

  The velocity of an object can be negative when its acceleration is positi8syf0/+fb-(hn j d9yn/bmrzh ve.

  If one object has a greater speed than a second object, the fihbc 93vg8 ootim5f*.e)6j8xj usi5ju rst must have a greater vi9 s6o8cg58jx oi)uh.5t mj3euj b*f acceleration.

  Two cars emerge side by side from a teivi8jx.:2,s4/c tv z hup8k qunnel. 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 acceleration dec7ytmex0s 6l+5*pp8,u vdhupe reases.

  A baseball player hits a foul ball straight up into the air. It le 6k ,+8; j fknzpnxa3sk.1(tgkljwr8x aves the bat with a speed of6k w;s1x pjf,8+tkg a .(knk zrjlx38n $120 \; km/h$. 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 it*k+ rya0m 0)5 n8kly(ortu7zmaur0q hs acceleration, how does it change if air friction is ignored?yrmma)0 k ua0zt80* y rn(l+uo5qhr k7

  As a freely falling object speeds up, what is happening tonqzhetq;z4jx:8hr)/l p t1/w its acceleration, how does it change if;4qp/tlj :zqnz )hr1h8t/ x ew air friction CAN NOT be ignored?

  An object that is thrown v4f5x,fk x- m.(khjinlertically upward will return to its original position with the same speed asil 4.njf,f-xk(mk 5xh it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceh1c6 gl 6+ffwbhw+f8 xleration at the same time.

  An object can have nonzero velocity and z+4ok* 3wd7(dk qrv ev jfua)1yero acceleration at the same time.

  An elevator moving from the second floor to the fifth65-ct kt. saxj f43luh floor making no stops along the way -xatkl5ujh3 t f.6s4c has zero acceleration all the time.

  A rolling ball moves from o. 4lmblz j0; 4qievt:6(piaucs((yn $x_1=2.5 \mathrm{~cm}$ to $x_2=-4.8 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mil x1(2o xs/ cnl4wjgev*e ($1 \; mile = 1609 \; m$) 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 straight line, moving 106l 8 xkjvo9j ;0pt7.zaq m away in 10.1 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average oqj7pzk0;vx.a8j 9tl 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 fro22+vi3ry 8llom5 aipy3py s*t;jas7(m v(j jxm $10 \; m/s$ to $24 \; m/s$ in 4.0 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 frog o t*8si70tutheyf/v0fl,) om $16 \; m/s$ 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 speed +t;m. rpb ac0oof $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentialu yab)c 9bb rfha2i65*ly top speed abouar a*h)5b i2b fy69ucbt $10.5 \; m/s$ in the first 10.2 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 speed7/b ) jfepw4l)s)zrcl of $19 \; m/s$ to rest in 4.35 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 hiyu0 ri1kus1 4jm1qe(vghway. Assuming a (ryi0 u4s ev1k1qmu1j deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin 1qnaygt7c1/;an;o p igaxo65g $25 \; m/s$ 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 min. After exact+mwf ftt*nc)r :/z,q kly 27.0 min, there are still 1100 m to go. The runner must +kmz/*t nffctr:w)q ,then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$