Suppose that an object travels from one point in space to anothem9*(lf0wm 8y (tx,i fapd yzyd. ier/4r. Make a comparison between the displacement and the distance tra8 9yr.xta,zidmy40(ip *fwe / ydlm f(veled.

  When is the average velocity of an object equal to p74nl7x c w;vi: wkb1 fzc2. :g*lfcfdthe instantaneous velocity?

  A new car manufacturer advertises that their car can go "from q3 zy;6v xmck0zero to sixty in 8 s". This is a descriptx6 k; 3ym0cqvzion of

  An object moving in the) dc vb8bxy 1blbry-3- +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelinz*bitnn2 ftpgcb/r+f: 7 y :p bp++nl;evrv)-g to the East (+x direction) begins to slow down as it approace ;+)tnp+f p bg2v-7rb/* ci:zyl r:ptv+bfnnhes a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling- xvscb7tyg n-k(u758 cdx*bx to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concern x8 dxb*n-s -ctc u7ygx7v5(bking its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemkk8 (,r*5l ee gqho a;r)1avbkent concereh*kag)kekb(v 8 r;5q,o1al rning its acceleration.

  If the velocity of an object is zero, does it mean that t vdd :p+ 2 sc6-wjlk-(ztenh-hcm(er/he acceleration is zero? Support your answer d/+ct6r2cemw- v pneh :h( (z-d-ksjlwith an example.

  Can an object's velocity change direction when its (r3 -u7f pdjjzacceleration is constant? Support your azjjr3 p du7(f-nswer with an example.

  Suppose that an object is moving with constant acceleration. Make a statvggwz s)j87- + fwk*ohement concerning its motion vkswz of-g7+h j)8*g wwith respect to time.

  Can an object have increasing speed while its acceleration is decreasir-9ljfn4ro( ;oei9 3vdn3yf zng? Support your answer with an exa rn9rf;-v3zjd e 9( oni4yl3fomple.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.(okalfou. ;n(hd- , xnhx5zs3ed*:zk Make hkk(o n - f*5lnz; ,z:he.su(d xa3doxa statement concerning its acceleration.

  Under what condition is average vel v.pcb ;59o8vgr w2nc0 kfmt0locity equal to the average of the object's inlm 20 vnfb 9ovc.p8wc50tr; kgitial and final velocity?

  Objects A and B both staroeyw6jip+0i4w;;g c f t at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as oc j;4w6 oige piw+y;0fbject B. What is the final speed of object A compared to that of object B?

  Objects A and B both start fre+pu9tlj eu-* om rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of uup e-j*tel+ 9object B?

  When an object is released from rest and fa/atvl3-m lpi2lls in the absence of friction, which of the following is true concerning tvp/l i-3m la2its motion?

  When an object is released from rest and falls in the absenchd10t 0lt :ujiuqjwoi *l;/1pe of friction, which of the following is true concerning its mot1 tphtw*lju 0l;dii oqj0: 1/uion?

  Suppose a ball is thrown straig qf 6 +3cfd(ig-0n(hwnkb zhi2ht up. Make a statement about the velocity and the acceleration when thnz6 d-hqi 23b+nikc(f (w0gfhe ball reaches the highest point.

  Suppose a ball is thrown straight u,bkw.5r n* smwl9lof: r51kdg p. What is its acceleration just before it reaches it5 * l51wwrg,rk dm nb.fsk:lo9s highest point?

  Suppose a ball is thrown straight up, reaches a maxiq p*s1ug4k23ou2d h)kw hxt p*mum height, then falls to its initial height. Make apsd *4*)1 2xkq23wugphoth uk statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight u5os5r d-r 3px.3a.bjjt d4(k1t ljqm5m +fzjqp, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velo drqtrja3 jmfop1.+ ldj(qjk45tm5.x3-sbz5 city and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absenc.nst2gko i/ ; lpyqff3k+igw9cnx: 8 .e of air resistance. Make a statement concerning its accek olfcqi9xgk: 2giy.s8f+p;.n t3 w n/leration.

  Suppose a skydiver jump(8f6r;tnt 2ku+j5y fs+mpdo m6:0 gx ttgv1xhs from a high-flying plane. What is her acceleration when shehf6tv8otp2 kt 1 (sr t0:gfdxn6u g 5mj;mx++y she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball isg)6:crfn(p79 l ddbj :ph o/uz thrown upward with a speed 2v (twice as fast). What is the ratio of the maxd /p hdpjf7:nr) 9:z 6ulc(gboimum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B is drod*a7v1p; esvhz*r 0za pped from the same ze *ah ;vzsp1*av r0d7building. As time progresses, the distance between them

  Ball A is dropped from the top of a build8w0pr siln: ,wi h7oob6e3zd9 ing. One second later, ball B is dropped from the same building. As time progresses, the difference inwo938 dbwi: ozh, sin7rl0p6e their speeds

  Two objects are throkv7w9tz )m-vl gds)lj:l 2e l-wn from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the strzdl m:ls-gl t)wjkl ve)v972-eet?

  A brick is dropped from the top of ,3iv+uob2f f 1zd2hug 3r-sona building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accev+h,iunzff -3dr2b 2ou1 gso3lerations of the two bricks.

  An object is moving with constant non-zerl1)y wg adbukxen) 5p q6alpo1l a2ysvd--796o velocity in the +x axis. The positions ag -7d)plxlwq6ayy de5b)o-l91 kpa6u 21n v versus time graph of this object is

  An object is moving with constant no:y/zf*o-bs30tx.v 4ted4e zyas+ cgl n-zero acceleration in the +x axis. The positi :e4l-bv ztzsxg+sat*f.yd4y ec o/03on versus time graph of this object is

  An object is moving with constan:zmmg:o/u -r-8p gpjjsu d3i (t non-zero velocity in the +x axis. The velocity versus time graph oo3/-s(p rj:8uum-g idpgzm :jf this object is

  An object is moving wi;ukw kg/(,+;y kmsky q.y. iscth constant non-zero acceleration in the +x axis. The velocity versus time graph of this obgsk ,yy/; .myqk;s kkw.+icu( ject is

  The slope of a position versus timehou6r, jkc2zl; a 43bso i; yu14l1pyy graph gives

  The slope of a velocity versus time graph+ fli6/ nnuedw q 38cddq-;f0f gives

  The area under a curve in an acc dxp4ub +t7he*b8psql/k/t 5aye ox8/eleration versus time graph gives

  The area under a curve in a velocity versus tdhx )zhp92as6t/8 hfj6.o0k+1r xrhmi kf 2ayime graph gives

  If the position versus time grajzezr 4y,e k (op.x1gyo -3gu*ph of an object is a horizontal line, the object ,jour.xe3 kgp4-o yy1gez( z *is

  If the position versus time graph of an object is a vertical itcc2u 4xz3x p 00n-ezline, the object is2cnxezi0 uz t3x4-p0c

  If the velocity versus time graph of an object is a horizoe.q+* kxdba)z izm; r9ntal line, the object ;a)mz r9zdbekq*i +x.is

  If the velocity versus time graph tul s1sj:*0)z mwo nhnt:n ;8tof an object is a straight line making an angle of 30 degrees with then)8::nttmzujs0 *wt sloh1n ; time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Findo5(f428w 1ngc/re.au s. vmaa cilaz/ both the distance traveled and the magnitude of the 5ewzua aco/ /c rs m(41a28na.f.gvli displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to movecxm-c*c n6u;tgvc8 x; 06rlds 12 km uc 8uv c;xdrl6cnxs6 ;mct*0-g pstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1pcnmr4 f8n gsrnw4nd)0w:x 5 2 mi = 1609 m)

  What must be your average speeyj/. al ilwl9f6 sos5s 9wm2bc) ch:p:d in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) 3lkrwhytsnq3zd ,+, s/rv w0x5 g: f0hin 2 hours and 57 min. What is the average speed of the run zxn srt/vh3:g,w0h5ql sr,fk3 w+y0dner in m/s?

  A car travels 90 km/h. How long does it take for it2kuvl pb1x 9e2 to travel 400 km?

  A ly (light year) is the distance that light tfp 3inj2 0c9yowfk j;9ravels in one year. The speed of lightpf3w29ycoif k jj90;n 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 r,13r mlh ywfk8oad and you look to the side for 4.0 s, how far do you travel during this inattentiflyh3mkwr 1 8,ve period?

  If you run a complete loop aroun1o6toz3tlrzqc w.; y:d an outdoor track (400 m), in 100 s, your average velocity isoyz t.o:3c;6 qw1trlz

  A polar bear starts at thsm 3gbzbs pibao -o4d*09ca,2e North 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 ave, bz2dm*4obaibaogc3 s0- 9psrage speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, theny+/h.x/ zm xp syj,5l3cjlytn v)weml (sq;+) 1.0 km east,mmw+e)nx /j5 l yq+yz.3/x)lt;s sp c, (vjylh 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 velocity?

  You are driving homeoy,* c, nahux2io v(i6 on a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/2*yuvn, c, iiooxah6 (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 1 yrkx ra 3,o w9zr6s(*:f4ecxv60 km at 100 km/h. What is the average speed of the motorist for thrfxw,(c 9ks rex 3 6a*ryo:z4vis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100k5(7j*dp nbn y km/h. What is her average speed for the tripn7*j5k(bn ydp ?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north foau,hsou k aur(1a*fs)6 t5en9r 750 miles. What is the average speed for th6aa,htfssok u)91 r n*auu 5e(e trip?

  In a 400-m relay race the anchorman (the person who runs the last 10br+ :e ku-h ;5qeqkno+0 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- oq+:keenk;u5 bh+rq runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop aft iv- rvz. fm:.xrpr9+ner 12 s. The car's average velocity 9vn.x zrr p :ri-vf+.mduring deceleration was 36 km/h. What was the car's deceleration while slowing down?

  An airplane increases i4*0mkj2ly wiq466zcjvam z /xco)n v:ts speed from 100 m/s to 160 m/s, at the average rate of l x4)vm *wn jo 0/ck266z ca:ji4vyzqm$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rayi2 wdly-p1;n9-gii ite 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 w 1so hh.o*)8lh6/sy y6ei vpypxm9/o 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 1jy 9ld )(xzho9ukf61(qx (dly0 s. It then speeds up with a constant acceleration)xoyk l l(xq9( jdf (hzud6y19 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 2.5 m/s experiences a constant acc6b 4w/c-uorzceleration of rcuc o6w/4-z b$1.1 \; m/s^2$. What is the cart's displacement during the first 5.9 s of its motion?

  A bullet moving horizontallbq,qax1 r l*.ly to the right (+x direction) with a speed of 429 m/s strikes a sandbag and p l*1,blr aq.qxenetrates a distance of 27.85 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an airct uxnr8,hevf21s u:v(raft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleratv,f:2vnt s u(rhx1 ue8ion is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration lzmq 1cm)8u h9ws9 c,sup0cy hji*6 a(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 distp ju28lv,ezx ojn2p.: d1y,l eance of 200 m. What is its average acceleratiy 2ujlnv,1,lxz:2 .p j eedpo8on?

  An object starts from rest and undergoes uniform a8vmwhy v k *qu4r,2m6icceleration. During the first second it travels 9.5 m. How far will ,uimyw64 qv v*hm8k2 rit travel during the third second?

  An object is moving in a straight line with constant accel y.zui t c33xqmt4hv4.eration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does 33zx itqu .yvm.44htcit move during this time?

  A car starts from rest and accelerat+5 pojhhjs6g7 es 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 capqes:(.e a;3k udh62eka 4txin 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 7u+ q n.-p9l -)mwxk6lvcyth b19wjrycar that has been waiting at the intersection starts ahead with a constytl6m71) w qlc-nwpr.j+x b -u kh9vy9ant 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 wit qv pxynpzckp6t: 7j,7j69ct-h a speed of 12 m/s on the surface of planet X where the acceleration du96pj-zjcv cx, kt pny77qt :p6e 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 mz2miovah vr8 zioh xsl ,*h )7v0/k.4planet X where to rivlh4mva /s.2k o8i) h,hxvmz*0z 7he 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 upw-w 1xo-j3frw-i jm:xh*wg6 us ard with a speed of 15 m/s on the surface of planet X where the acceleration due to gravi srwfhm wxi6u:x-jo-g- 3* 1jwty 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/)zo 3g x 8x00hxfo+sxss on the surface of planet X where the accels) sfxo0x 8hxgxo+3 0zeration 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 03r iob/ 39bear.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expecr3i/rba 9 bo3et the ruler to fall before you catch it?

  A ball is thrown upward6 i-kbhg(16j.zhf pam,j/jou at a velocity of 19.6 m/s. What is its velocity after 3.00 - zma , jbhh6.oiju /pk1jg6f(s?

  A bullet shot straight up returns to its starting point i1xix:axf1nwy6j. b0in 8 s. What is the initial swnbx0ifaj: i .yx61 x1peed of the bullet?

  A ball is thrown straight up with a speed of dyf+8 l niww +0u7,kf+xnx ab636.0 m/s. How long does it take to return to its starting pointa++ u,nybxwdwfk8 l0+6 x fni7?

  A ball is thrown downward from the top of a building wjcs8n to7q2g :ith an initial speed of 22 m/s. It strikes the ground after 8.0 s. How high is t 87n:2tgsjqoc he building?

  A ball is thrown straight up with a sp-dkyxts(6pp u pexak-16bss*3)ww q5eed of 30 m/s. (only fill in numerical value in the blanap1x6ux)wp3qw6k sy-5 ks*(-bds eptks)
(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 speed of 45.4 /jll .sylig77cwr gv: lh.,z)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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = yxghn 7a-)d n7j7gi3+ se.r 8qoy) lal1.0 s?

  In Fig. below, what is the velocity at t gb:zd nn .0 *wfs(ucja6yw8.e = 2.5 s?

  In Fig. below, what is the velocity akp*1 af3ve:e/u ph33 e ;x pe3sx8pspat t = 4.0 s?

  In Fig. below, what is thep g0gpx9)p 0ka;:v0 refto6pel4g)lw 5-g p uf velocity at t = 5.5 s?

  In Fig. below, what is the aver*xiwerxpryh. .8 sv /,age velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6. ak +iaotn*:lo1e;8 p3b,vxls0 s?

  In Fig. below, what is the acceleration at 1.0 s?f53yo6o5q0fh4a h yel

  In Fig. below, what is v/qoaa6 6seg1 the acceleration at 3.0 s?

  In Fig. below, what is the average accelewk t+ :jve1:1k d/gj,w*kzei dration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s )( ixjv oaei/2pa3)zv?

  In Fig. below, what isp,gjy+ zq7apno 3 1bg92wfby , the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {sp4t:ai ry boxs+ y 6iar+sq.w)3eed|velocity}

  An object can have a varying speed if its velocity is 8c-f7mq;o7ry5n y1 ah /n t n.e5pbyjsconstant.

  The velocity of an object can be negative when its acceleration is positi 4fsuux/3cq5+mpn 5 ydiz:j9ove.

  If one object has a greater speed than a second object, the fi;jfo9gc5ui( b7dkz5 i rst must have a grea7u;z5if 5(boij d gkc9ter acceleration.

  Two cars emerge side by side from a tunnel. C*vj9 jsu km;v8fu95yb umid)1ar 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 spee );r.0xefl mz uktyo ;t4vz5e. rlol)0d as its acceleration decreases.

  A baseball player hits a foul ball straight up into the 6(,o- 5qcfxvenq nvk;air. It leaves the bat with a speed of v,e nvqqo-c k 6f(;x5n$120 \; km/h$. 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 obje/ xkl,y (d. rr6 cxh*i f:()krr.ejxlect speeds up, what is happening to its acceleration, how does it change if air lrifkey).:xj e*rrxc.h x, /kl((d6r friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration s9w.6tk+widtks7j ;b, how does it change if air friction CAN NOT b w7kst ;6t+bwjd9isk.e ignored?

  An object that is thrown vertic8dnl b3wro /i1ally upward will return to its original position with the same speed as it had initiall8rd31 n/boiwly if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and wqqb 28p9k1md nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same time.hx5n 1 5z+mxku0t+eyw

  An elevator moving from the second floor to the fifth floor making no stopctu8c +wdu; p)s along the way cpt;+8w c d)uuhas zero acceleration all the time.

  A rolling ball movesnoc0 p6rciy .)i/+lk t from $x_1=2.9 \mathrm{~cm}$ to $x_2=-8.4 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ 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 $t_1=-3.5 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight compq+nr. wn5t0 ukzzg5w 21c,ay tlete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.0 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from itubkva:y2 u67/ npobo *s trainer in a straight line, moving 114 m away in 10.9 s. It then turns abruptly a*6bna opo ky7 :2/uvubnd 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 from n8/zs k+j78pkgi ei r9 e.ygm9$12 \; m/s$ to $23 \; m/s$ in 5.5 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 f+u m/a;l,qn 14nw , rcy2ncbv$22 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spe0gfy3t kjt c)(ed of $33 \; m/s$ 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 essentially top s i 6rcubtq*3pp: d0-eyehyj39 peed about *uy :dp6yjee3c9p r-3 h0qi bt$10.1 \; m/s$ in the first 11.1 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 uniformly9hvzr(w vwb9+ from a speed of $19 \; m/s$ to rest in 4.14 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 t nvxpgv7a 9ec i,4udsg:*:w (the highway. Assuming :vxutpea n4v7* w,g:dcg(si9 a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going vfnu td kldi79z8r *8k4lrv.:$25 \; m/s$ 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 1a jk0 ;,ptoz:z0,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must ttk,;0 :po jazzhen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$