Suppose that an object travels from one point in space to another. Makkgb, y 2k3v2)6w 7opam dgei5ke a comparison y,g)7ek3wmb5a g26 dkp2oi vkbetween the displacement and the distance traveled.

  When is the average velocity of an object equal to the *.8 xn )kgivve19*gt ildt hx(instantaneous velocity?

  A new car manufacturer advertises that their crv eeq+-a. rc5 7ksep*f13wxzar can go "from zero to sixty in 8 s". This is a description kc+qsae*zf3 r.x57 v r -1eewpof

  An object moving in the +x ax-sudfjk :i,(mis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to o:vnca50p( vfe k*t2sthe East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its pc0et (nvvks a25of:*acceleration.

  Suppose that a car traveling to the West (-x direfme * cd9:+sthkscq 88+drh :ea(ny8rction) begins to slow down as it approaches a traffic l8+af*s h: 9str+ c y(nd8erqdc8em:kh ight. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Makedsfh7 bv;gdjsb,,y+9 a statement concerny7s+dvbsgb9h;j,f d, ing its acceleration.

  If the velocity of an object is zero, does it m twt0rjzoyw*,m*t)u x6vp )3 nean that the acceleration is zero? Suppo u6twz)w rxj pv3tm0o* yt,)n*rt your answer with an example.

  Can an object's velocity change direction when its accelerat, 7j . n9j97m uy /a2dx7)qzu7rlxlb 4gnotjftion is constant? Support ljz9naj7,gdj7 lu/ymttn972f.br xq4) uo7 x your answer with an example.

  Suppose that an object is moving with cbor 6vf 5u2hl1onstant acceleration. Make a statement 16r u2hvo5bfl concerning its motion with respect to time.

  Can an object have increasing speed while6rdj8ruxay* 9 /kd.v6 fd6hc8g vrol- its acceleration is decreasing? Support your answer with an exampl 986a.-8 lfkdjxvy/6 o 6dgvrurd*hrce.

  Suppose a can, after an initial kick, movea:dmmy4na1 t5e no u6v-r4xc:s up along a smooth hill of ice. Make a statement cvexo:4u6-da 4:rc5 mt nn1aymoncerning its acceleration.

  Under what conditiongz,w1fz* w6bhvu eke69ak7. b is average velocity equal to the average of the object's initial and final velocity*z7uak9kgbw e6e bv hw1 .z6,f?

  Objects A and B both start at res(q( ,zxxyvv;mr*oezg+ve8n y8w. c6ot. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the finazn68e yqm gz .*((y rxx8c+;vvovwe ,ol speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate.x6tz;gx6y ge6v2 r1 rn However, object A accelerates for twice the time as object B. What 1;r6re nx x66v2g tzygis 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/7z.i wexg; fx, which of the following is true w ;7gz xef.xi/concerning its motion?

  When an object is released from rest and falls in thei fkg-/ v-fu *(c4azez absence of friction, which of the following is true con(fikvz/eg* uc-f 4 -zacerning its motion?

  Suppose a ball is thrown straight up. Make a statement about l h0/khf1iy,5 .hmldothe velocity and the acceleration when the ball reaches the mk0hfod yh hi/l.51l, highest point.

  Suppose a ball is thrown straight up. What ixfxl b5/yzwbw 4vf1n4 g40hm 3s its acceleration just before it reax3vl0 yhzmg4 ww1/4 x4f bfnb5ches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum *n3f z dt r1w.aqmh5hef.vv-;height, then falls to its initial height. Make a statement about the d 31rnvv5f -.md.zfthhq*we ; airection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight z d81kp39.qlswx h4 wdup, reaches a maximum height, then falls to its initial height. Make a statement about dxw 9hsk.8qwdz4 1l p3the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of.q pqmi5qq:t0 x0rp.j shx1s0 air resistance. Make a statement sq.q:pxsprhq0.00 5 jqm x1 itconcerning its acceleration.

  Suppose a skydiver jumps from a high-flyinj,1t-3joj/mche q 3xfg plane. What is her acceleration when she she reaches terminal vfjq3/jm1o et-,3ch x jelocity?

  A ball is thrown vertically.lg 7ep+no4omj4c-ml7b 7 cxo upward 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 t cpc7lmxbm44-ono +7o7 gel. jhe first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of p m u;dh:;jfp)a building. One second later, ball B is dropped from the same building. As time progresses, the d;uhj; p fp)dm:istance between them

  Ball A is dropped from the top of a building. 0 kilueek -89w One second later, ball B is droppue8ei9wk-k0 l ed from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is )pf bwyfvqzd9*:g6*0y z*bl hthrown up, and the other is thrown down, bozb09dz yqv*l6 p*fb yf*h :)wgth with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown snw4 x zxuj934rtraight down from the same building. They are released at the same t 4uwrx9n34x jzime. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zerzywpevs 3yb2fwena6qc ur896 og.v+s-*;q0 v o velocity in the +x axis. The position versus tim8-s9* 0 ov 6anqvwpuzw3 ;b2ec+yy 6.esqfr gve graph of this object is

  An object is moving with const ch5bz,z6n+ /4n hmgubant non-zero acceleration in the +x axis. The position vecg/u+z, hbn 45hzm6nbrsus time graph of this object is

  An object is moving with constant non-zero velocity in the +x k *in-wkzj+:p axis. The velocity versus time graph of this obje:*zikknp-+ jw ct is

  An object is moving with constant non-zeri rh/;gd5h*, tf6gtdto acceleration in the +x axis. The velohfd ,g t/tigt6;5*h drcity versus time graph of this object is

  The slope of a position versus time gra7nmf e z 6m,hweu96g0iph gives

  The slope of a velocity versus time gjnp 70+ ,atpiia 0ov :4(esucyraph gives

  The area under a curve in an acceleration versu uhhsto4w-h)8a) g/wjs time graph gives

  The area under a curve insvx gp+i43x r6 a velocity versus time graph gives

  If the position versus time gr;enw wt i+85q,4 k/tbfshmu g/aph of an object is a horizontal line, the object iuieb/, nms wg;8w4+fkqth/5ts

  If the position versus time graph of an object is a vertica0sl 1pk1uyh.ygk p8t(l line, the object isyglp 0 1p.khk1 (u8sty

  If the velocity versuqysxcs:cn :2b90 2-cxn hbp)g s time graph of an object is a horizontal line, the object isphnxb9b-s::2 sgq2c )0 nycxc

  If the velocity versus time graph of an owq4it s* n0m s9+:bdq 6t)g+pp0 elpixbject is a straight line making an angle of 30 degrees with the t:t ip*9qssd0wp4q6m pxi+ngebt )+l0ime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. lzc4z3cq z.8(p c yyt0Find both the distance traveled and the magnitude of the di4qz0z zt(yy3p.8 cclc splacement vector.

  A boat can move at 30 km/h in still water. How long will it tav e mlf2kk0yph34y. wg+3ry c owz,7d:ke to move 12 km upstream in a river flowing 6.0 km/h?hyo.ez3m,ydv k+3g2f plw w:r0 kcy 74

  55 mi/h is how many m/s? (1 mi = 1w g4nfx7d(g no.igo5;609 m)

  What must be your average speed in order to travel 350 km ih1j2pdxoe,gvgu5j; .7a* vwin 5.15 h?

  A runner ran the marathkc zph-k*y+-non (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of tnzckp *k- +-hyhe runner in m/s?

  A car travels 90 km/h. How long duasj 1/q :e+g.x asy9coes it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one yearyv33sdv .7a0ddo *vcd04d j6nwvm u/k. The speed of lia mv*7dsvnd dv3w vudjo0kc6y34 /d0 .ght 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 str+r3 d)wr ltgih )(y+txaight road and you look to the side for 4.0 s, how far do you x++w)(it)h r lt3y drgtravel during this inattentive period?

  If you run a complete loop around an outdoorjlbr53onyb12* m zx arb7d,f9 track (400 m), in 100 s, your average veloc9 f ar 2d7lyn53obzb*1jmxr b,ity is

  A polar bear starts at the North Pole. It travels 1.0 km soute;v8 9hkb8;),t khqr cmly3 qkwa;i9qh, then 1.0 km east, then 1.0 km north, then 1.0 km w,h ky;ekqq; rlh8qw89;mcbatkv i39)est to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It trav o*yl wacv. b+y7 1 )r1/xo;wczfdhgo5els 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. Thic 1wbxv7d.) y; oc yohg5/wz+1 ofarl*s trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from nybk-4dx urzp45 snoj-sc*v.v v3 2k9school at 55 mi/h for 110 miles. It then s3zs.5v*kpdvcryv2 xk o nnb4-- j4us9tarts 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 school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 kmr6 wq6a ayevk9.g6x5,)pypi h/h. What is the averagqp rp,a9g6ya)w. vxe56y i 6khe speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whid(wg ,d6p. rd pyrwn2iy.quvqk( ((3at is her average speed for th,(q(uqk (r ipyny (dr. 2p.3vdiw6wg de trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for/ ow3na+sxqg 4h +rhn, 750 miles. What is the average speed for th/4o rgh3s,na++wnqx h e trip?

  In a 400-m relay race the .r6zdbjr sf kh. -10gqanchorman (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 racez rr..gjbd0- 61qhsk f?

  A car decelerates uniformly and;:ovfbr sl, xy/wy 9d+n.jg p1 comes to a stop after 8 s. The car's average ve,r ys xg9 yn wd/+.vpfjlo1:;blocity during deceleration was 66 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/ eswmcz95cv wh)) g-.ss, at the average rate of .sw5ce g)-9 mhvwscz )$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thex (1ivfvm+3 xw rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and acceleratespu+t1lb1 31,rhbvmq a 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 f;r iy8nbgtvym*qjl: n- kk 91;or 10 s. It then speeds up with a constant acceleration of mk 1ly;n8i9yt*qj ;br-n g:kv$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.2 m/s : ** o5kb,at6jjer c*n bpdu;hexperiences a constant acceleration ofn 5kd*e 6tab :r ,o;jbpc*ujh* $1.6 \; m/s^2$. What is the cart's displacement during the first 8.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 294wx u sho9,plp h3n9,3q m/s strikes a sandbag and penetrates a distance ofnq 3p3lwxuph ,o ,9sh9 53.82 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launche*n /) br)jayvhsngg 7(.fyjo/ 2ppk6l d from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration ro. /ya)jfnj26 l(vp/syh pn)gb*g7k is constant, what is the length of the catapult?

  A car starting from rest moves with constan5krr)-j n36yqm s 9s rqznz5)pt 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 distanccdx6ah:z gvx316s d 48lfvf )ke of 200 m. What is its average accele3ddsffx14 h: v)kca 66glz v8xration?

  An object starts from rest and undergoes uniform ;zp q s2j p.,7wrhzzz;acceleration. During the first second i;hpzqw.jr2, zzpsz7 ; t travels 2.4 m. How far will it travel during the third second?

  An object is moving in a straight l5z5 ndo bc;c7lm f 36oi5jqwt9 yy8jd0ine with constant acceleration. Initially it is traveling at 16 m/s. Three sejlq5d0;5zf6nid oj79 85ycw mcb 3toyconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and act-;6ozo9u xk-ox q.krrh x)t,celerates 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 ror.8rp*sxneim5 5yjch:5x)t8(k dd .h j3jxn bad 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 cab(r vzj2 0c3o eek)::pvs6oqpr that has been waiting at the intersection starts ahead witheks): zpcvb62r po: e3v o(0jq 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 mjxbh(5 p61 pyzs24lpwith a speed of 12 m/s on the surface of planet X wherelxjsz52pp6p4( h1m yb the acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface of planet u 2pwj0bdn)u)-jih4 fl07 op eX where the acceleration due b0 0doji-j4l w fpnh2p7)e)uuto 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 pl iqvy4qsgevmhl.,-k-z;2 r 2 ganet X where the acceleration due to gravity imy2i4qe- ,vl-ggzs .;k2h rq vs $2.5 \; m/s^2$. 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 owo3bb rm8p0u 5lfo)l 8f planet X where the acpf8url8mb0 wo)ol53bceleration 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 gr9q+ rnpyfatpzfoil),, 2m*8jeater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning,fzjf,n 9 +a,p2qo* pitr8myl) how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity v; krgr.(dke+ after 3.00 skk r.dg(; v+re?

  A bullet shot straight up returns to its starting point in 18 s. p*b+c 7wq b awm .tql/51,piqq What is the initial*15aq iw.pqbqc,+ mwb plq/ 7t speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 me+/ ;l1 vo2l;e6x(0y at xw8fmytf wwi/s. How long does it take to return to its startt 0ymlw;/lftv+e 1;(6wxx af yiewo 82ing point?

  A ball is thrown downward from the top of a building with an in4f-8j) xxj jggz(;wmiitial speed of 23 m/s. It strikes the ground after 3 8wzj;m(x-4g gijf)xj.9 s. How high is the building?

  A ball is thrown straight up with a spuk+d fnj 24ummqz59h6b5jr k* r 1g* bp-(upzbeed of 30 m/s. (only fill in numerical valz+up(mrjfk*r42jk*m5 g6 nd bhb51u ub-qp 9zue in 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 upc(,:k,ssuk)muw9xmr into the air with a speed of 23.1 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)gii) x2bu+cisl qz,5 velocity at t = 1.0 s?

  In Fig. below, what is the velocitymk2z6(gy ;qx m at t = 2.5 s?

  In Fig. below, what ;xf+2bd(s 3o/0ilqs befl 7 owis the velocity at t = 4.0 s?

  In Fig. below, what is the ve 4oac1 x k)94e nfx pn/ikl8(.mzr;yjflocity at t = 5.5 s?

  In Fig. below, what is the average velocity h7f.iflj /dnl,9ig 5 j :/j-rcwd5xhdfrom 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to )yz2qdvc6a1e 6.0 s?

  In Fig. below, what is the(p+2 .i9fwiaa8lqhdi 93wqn mca; hh/ acceleration at 1.0 s?

  In Fig. below, what is the accel qy)dr u s-ceh-lzj5+9eration at 3.0 s?

  In Fig. below, what is the average acceleration fromcay1s/+0) puwhp0 o -)a-r ggofky:xs 0 to 5.0 s?

  In Fig. below, what is the average acceleration ffyjj9l;-d i 6w xeum8+rom 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 9: hmxxfj .e4is?

Does a car speedometer measure speed, velocity? {speed|veloba2fw z, 9efq+mh. l7pcity}

  An object can have a varying speed if its velocity is constant.cbfpezyy5/ 9k1nrt7 .hma3j0a/ l es-

  The velocity of an object can be nega7o9axo0s;gnnb h 6uazac/ v 6ms(g..htive when its acceleration is positive.

  If one object has a greater speed than a second object, t;xx 77*xc-s b-z impuse3 ni(mhe first must have a greater acs-*u7pxsz 3i; mm ix(bx-e7 ncceleration.

  Two cars emerge side by sid9:bsn*4 nzte 6oea)xhe 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 2 +yg4odrdit hq/ 05 -tqzsmh0acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bar5uu 2xswn3y yu y(;tf+ h30nclodq4:xw y.a/t with a speed of 5td3y/osla:fw4 .c w3qyn+u0;hn ( yyrux 2ux $120 \; km/h$. 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 h86*vv f xovm.qv6 -ncits acceleration, how does it change if air friction is i6 6mcn8v v-oh*vx qv.fgnored?

  As a freely falling object speeds up,/fg1zf z+ ,i w9aohyqe,.xn u3 what is happening to its acceleration, how does it change if air friction CAN . noia,xfuyfqw/g+e9 h,3 z1zNOT be ignored?

  An object that is thrown vertically upward will return xls(7:8, usk-8 1rsuto(wb .mlegfft to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreskos1( ub 7wt f,s(lu:erg8 f-l .8mtxciable, how will this result be altered?

  An object can have zero velocityajx qi/ulh(wo- 9kff (:a.y0f and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same cned6awech k* .e1t3;time.

  An elevator moving from the second floor to thr y4oa2 tpxyr: +avj(/e fifth floor making no stops along the way has zero accelet rpr/+4vo:( axyaj2yration all the time.

  A rolling ball moves fromd,li)drx* k :b $x_1=1.8 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.8 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps arq.r3e6gk(k eaound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trai)j1ph 24pmh wutq t0d0ner in a straight line, moving 97 m away in 13.3 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average spm 1tjth0) u 4hqdp0w2peed  (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 frw yqb kcchcm s+m02/:ylb5zp5e+ 7 o8eom $11 \; m/s$ to $24 \; m/s$ in 6.0 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 from,7 w)vc6e5k gkokq1nh $19 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of b4fks 61c8fk8abf(n ( f6qldg$27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially ytjc ;u1h g.gy6us(bk. lf/,m top speed aboutgcyk;y g(/sh.bl.fumu tj ,6 1 $11.2 \; m/s$ in the first 10.7 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 unifor-7svb n (7 rt4m1neh2 nqk34hijg( uflmly from a speed of $18 \; m/s$ to rest in 5.69 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 highwa bzz04sg/p pg3y. Assuming a decelerag3zp z0s 4g/bption of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go-8c1opdg-ox0+l nrd/c 1lhct ing $25 \; m/s$ 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).    $m$