Suppose that an object travels from one 8-fjp ;yntm0t:v a69o*ogpcspoint in space to another. Make a comparison bo6nftyc0 mts;:* 8v-pgj o9p aetween the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous 4lzj+v-x3yk e3 wib j9velocity?

  A new car manufacturer advertises that their car can go "from zero to sixt ge1dae2aj4ty q 2h pw-4ur20hy in 8 s". Th224t0 4herajuy 1wqpe2 d -aghis is a description of

  An object moving in the +x axis experiences an a 0l) xpx)kbdt,,r ,a,:w/oixdvkp/xz cceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to th/h tj2,/ wlh8,8ydsxx4uoxu re East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concer,ld sth 8u2yuoxwr,8/x h4/ jxning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down as iv3okg x 1yf2p6q2,:av3xe yrnt :of pyy6 3kxxrv22qv 3n,g a1eapproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemeuh n oe+hm pj2w,)+b1udqkv1+ nt concerning its ae bvp)n1h 1k wm+,uohjq+2+ducceleration.

  If the velocity of an object is zero, 3/wsl a4.cat ydoes it mean that the acceleration is zero? Supportc.as4 / ylta3w your answer with an example.

  Can an object's velocity change direction when its/ j6gks1)7tkda7gy/1e clmg t acceleration is constant? Support your answt e6kgam ks1t1/7 jlg)d7/gy cer with an example.

  Suppose that an objey;z) u-es mayzv(wv7o iz plgk:,4dk 01(tk;cct is moving with constant acceleration. Make a statement concerning its motion w7-kt; epod(z4 gluw;kv :0)skm(czy,z 1yaivith respect to time.

  Can an object have increasing speed while its acceleration is decreasings)jsy jwwn/b j/ wb0 mc,1d(h0? Supporhmb j jn/b,s/0cyw1d )ww0 js(t your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of inw)tz 7f a6i*g.a4pbuce. Make a statement con7ai)wan4gbp.t fz6*u cerning its acceleration.

  Under what condition ismshl(le d 018i average velocity equal to the average of the object's initia ld is1h80eml(l and final velocity?

  Objects A and B both sta .xf: 87dzviv6k, qjfxrt at rest. They both accelerate at the same rate. However, dvfxjv.x k:8i7,f6qz object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. i q 8l qf*4+gw)zycvk2k6h4jr However, object A accelerates for twice the time as object v4 c8+hkfrqyw)*g64q ik z2ljB. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls i1,lsko yc6p r-n the absence of friction, which of the following is lyrk ps-o,c16 true concerning its motion?

  When an object is released from rest and falls in the absence of frictionlk0iacbh/pt)c/921b;jm azm , which of the following is true concerning itac j1mch/m0/)b9bli2 at kp z;s motion?

  Suppose a ball is thrown ; /ox-bwb;bczd ;pbesf3odx,:b 0. qg straight up. Make a statement about the velocity and the accelerat- ezob;: f bb; pwsxcbdxo/,3;d.g0b qion when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just k/:odtxis9(s + /mapibefore it reaches its highest :+i/ix/k9(sms potadpoint?

  Suppose a ball is thrown strai0z/,fztlvat8fz ) u s;7 +cj2k, wfmmvght up, reaches a maximum height, then falls to its initiazz08 2jaukl7cm);/+v,ft zf t, wvmfsl height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxipnohw .8hzvh+/mz1 h9 mum height, then falls to its initial height. Make a statement about the direction of the velocityo+zh18 vz h h.9m/nhwp and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a stah/.tj)bq n4udb di:o c ftk:)*teme:noj )fbhc*)/ udk .dbiqt4 :tnt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleglywj ;4ezm0tb: j2-dgwyr+ * ration when she shy g4+*yelj 2 0w wrd-jbm;t:gze reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An id:q3/-xuw x:z;hpdij aentical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times hi q-/xdapw z3xi: ;:uhjgher does the second ball go than the first ball?)

  Ball A is dropped from the top of a bfsd h.beyfe,-eo (1ddu0 i65puilding. One second later, ball B is dropped from the same building. As tim ,e1efe-b6s.ufio(hd5pd0dy e progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is droppzk g1u (tv8gi;p:0t tved from the samu1 vit(08zv;gt:tgkp e building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is th9e)7 y9msl mcnf 3x6ztrown up, and the other is thrown down, both with the same initial speed. What ar6 x9 nstf37 m)lmzecy9e their speeds when they hit the street?

  A brick is dropped from the; ebfo th.i)nc: lm33d top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acceltb;mlo dc3ife: 3n ).herations of the two bricks.

  An object is moving with constann /dp2l wh58idt non-zero velocity in the +x axis. The position versus 5hpdl/iwn2d8 time graph of this object is

  An object is moving with constant non-zero acceleratio0p0j; rb;w3ci-br;t kbcb rl;n in the +x axis. The position versus time graph of this objecr btc0pjw;r3cr;-bk0l; ;ibb t is

  An object is moving with constant non-zero velocity in the +x axis. The veqlpg ck-14x. gm98h bq m32dc+ mhte7flocity versus tiqcx gcm3t l mpkq.4 eh+g 8h-7bd9f1m2me graph of this object is

  An object is moving with constant non-zero acceleration in thzp t+mwrev+8lpf )hvn.p2t2 )e8jrx /e +x axis. The velocity vers8 vh e)t z)+rt m/p2v.fjxepp2+r8wnlus time graph of this object is

  The slope of a position vhvoeq/q(e f )qmyv6 90ersus time graph gives

  The slope of a velocity versus time g6mtkx(g*v*n6sq lf ht)/yxj. raph gives

  The area under a curve in an acceleration versdr3.i7cmqd 2xus time graph gives

  The area under a curve in a velocity versus time graph give wvxut(;3g-85b;( uv uygllx os

  If the position versus time graph of an object is at35-rxq 3po4+j dixky horizontal line, the object q3iy x3 j4p-d5x+kot ris

  If the position versus time graph of an 9 ig2,mkli;ae object is a vertical line, the object is;i,l i9kmea2g

  If the velocity versus time graph of an object is a horizonta6 ob2k5l pgx)+ sjlj:al line, the object iskjxog: +2l b)sa5 6lpj

  If the velocity versus tim lxev nldd+ lrdlfcy 6c;gr p(5j7i9 4*yf5s(9e graph of an object is a straight line making an angle of 30 degrees with the tl5y jer6 src yfd(x9n*dv7p+d ( 4fgc l59l;ilime axis, the object is

  An object moves 15.0fi,41,zyy kb: dxzj +o m north and then 11.0 m south. Find both the distance traveled and the magnid,i: z4 z yob,1+ykjfxtude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will + bq k1hmtc-flt 39d:).bg pdxit take to move 12 km upstr.dcl b1:kx +d mh)9pfbtgt3q- eam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s?;e;6:1 a 2jua9je ucbzrbob , 3ugw:hr sb41ar (1 mi = 1609 m)

  What must be your average spe ow5hwyhgo6( )(g5d ived in order to travel 350 km in 5.15 h?

  A runner ran the marathon (apgah8 vv n x:nv j e6r1aqij3jy 4k.8vv,3d+s.hproximately 42.0 km) in 2 hours and 57 min. What is the average j gqvnx1v+v. 8 .ha:yase3 d83i6jh4vrvk,n jspeed of the runner in m/s?

  A car travels 90 km/h(k.+jv1 syoi:.sdk ys7wzw(m. How long does it take for it to travel 400 km?

  A ly (light year) is the distgx* /bx2lu3 taance that light travels in one year. The speed of lix x3gbtl2/a* ught 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 c 5muxe2pv 8gbd8z5l6g/ vxn7+p7qazjo. +ipoad and you look to the side for 4.0 s, how far do yd+exqxz u. og mg7vp/c 785avjp6n2+b zilp8 5ou travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 1nx+ k7n.gmja)xm6 mn000 s, your average velocity is6m+nk mj0xxn.7)mnag

  A polar bear starts at the North Pole. It travelwx8gtw9,w z.os 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 spog wtzw8 x.w9,eed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.rle v+voj;ffb+g/w-e a4 g,6 r0 km east, then 1.0 km north, then 1e w rrv/+6;geovff4l ag,jb +-.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h by peudu;z4xj, w1i*+for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutej iwuzue;x1 ,d*4yp+ bs. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km 5e uns26qo6mkat 100 km/h. What is the average speed of the motorist for this tonem52sk 66qurip?

  A motorist travels for 3.0g5 1wd*qllg 6b h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for t5gq d1*6gl lwbhe trip?

  An airplane travels at 300 mi/h south forwj9max;(k o ( rlrvi )owo;,+p nzf-sb.s0j 2l 2.00 h and then at 250 mi/h north for 750 miles. What is the averaob0l;2moko(9jzf. r(rp vx- +w ;, j)wail snsge speed for the trip?

  In a 400-m relay race the anchorman (the person who runs nod8uk y ,k9h5rdqnb2)u8j f2,wc )rdthe last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover krq8d8j2du kc) rd fwh5o,n,b )2u9yn100 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?

  A car decelerates uniformly and comb:gkm vh6y7(8r b -fox +yoe/qes to a stop after 9 s. The car's average velocity during deceleration was 69 km/h. What was the car's deceleratiome xrko/ bg+o:yfh 7(bv-68yqn while slowing down?

  An airplane increases its speed from 1 + ,fst2p.b:j;ovisrl 00 m/s to 160 m/s, at the average rate of +t2pr.jlso: fv,si; b$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate*a28fe*gky+wt q s(xt 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 accel903s.;adg cjvaayktq db.y ; ;erates 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* d66a fp8xt*wj*hg s6cqst0 w constant acceleration o g8qcj 6ts*6xd*stw6a fh*wp 0f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.1 m/s experiences a cons*v qvj)8jbj9; zbwz :jtant acceleration of jjvj9; 8b *zzjbwvq):$3.7 \; m/s^2$. What is the cart's displacement during the first 5.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed1 ozk/fed y/p, of 250 m/s strikes a sandbag and penetrates a distance ofyfz/1e/ od,kp 89.67 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fsqw) pfkh u4i; 6rsz:r / l/a5waw02cyrom 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. Assumin/ ayprw 2kf uz)5lr6/:4qi cwas;0w shg the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves withvq9cfrv17 4 kj 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 is v9n0cu, x0bs/hdk0wp its average accele,00 hvp k s9w/ncuxbd0ration?

  An object starts from rest and undergoes uniform acceleration. During the m.( dw ucxw1e) sr9vn;mc(xz. first second it travels 7.0 m. How far will id.wv1eccx(nz (r ;ux.w )s9mmt travel during the third second?

  An object is moving in a straight line with constant acceler,f8wk qgdoe)60prg snb/ 7w (oation. Initially it is traveling at 16 m/s. Thwo be8(,ow/ k7 d0fp s6rnggq)ree seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniforml-e+iqrca 0rd9y 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 ep/ . 2.b4mefr jgs(zpdecelerate 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 tubcy3oz h r0h)5:m f7tfrns green, a car that has been waiting at the intersection starts a)mty fb3r7 0hc5ohz f:head 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 of planet X whe; (vouwcoziaf c65 *)ere ti e u5ao ;zcv6(*wcof)he 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 surfac7ylt e pwvb9 89n(f7zfe of planet X where the acceleration due to gravity is ve p(f98blz fwtn9y77 $1.5 \; m/s^2$. 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 :qzfh* xcp7+p the surface of planet X where the acceleration due to gravi hfppcx7 +*:zqty 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 bpo: xjwxs9 3:14 m/s on the surface of planet X where the xjpob :3s:xw 9acceleration 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 t*fn rn0q7x e 04cofl +5pwe.edhan 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect t0 lncx7f pf4deew eo*5rnq .+0he ruler to fall before you catch it?

  A ball is thrown upward a v:y( baz4ul7r0w.vsut a velocity of 19.6 m/s. What is its velocity after 3a4 l:r0 (s7yvuzv .bwu.00 s?

  A bullet shot straight upf), dexi97veh returns to its starting point in 17 s. What is the initi dvexih9e,)7 fal speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long doz) g/euar oomc6c95dtbn85 5 z*o0pmzes it take to return tou 9zodnpr085oc)5zeo 5 * mc /gz6tabm its starting point?

  A ball is thrown downward from the top of a building witu0 q,4heiy253l- ncioi9nma wh an initial speed of 17 m/s. It strikes the ground after 4.0 s. How high is the building?q y0o,eiiln5u 3c4 hiw a-n9m2

  A ball is thrown straight up with a speed oh,t* d4d k0pi2 2fij(vhmtb5 if 30 m/s. (only fill in numerical valuebvh,dd2h2kt ( iipjf0*i45tm 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 up into the air with a speed of dz6e /lyw*1g 1 g1insj37.1 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1 3lswfhw( cb-ty.ym-1.0 s?

  In Fig. below, what is the velh3smk0. ;cexsocity at t = 2.5 s?

  In Fig. below, what is th83)jdkpof tgnh6 yp 3-e velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s? 1n9o xhrox2w7

  In Fig. below, what isuq7z,hh utm*jhfi( :74y nx z( the average velocity from 0 to 4.0 s?

  In Fig. below, what is th 8nrrasstp s(npgf nc2aq;* : .m h:v-)(kv+cje average velocity from 0 to 6.0 s?

  In Fig. below, what is the acyp6ep *0db5a v3k ebdpk4 ot1-celeration at 1.0 s?

  In Fig. below, what is the acceleyg*hcz(k (qf(/k8ql mration at 3.0 s?

  In Fig. below, what is the average e2. t5)vw5p2e; qd (-x gaftnf2xkxtpacceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 t. +1,-*)bx,ggys5z q s5yrxjno tudp zo 8.0 s?

  In Fig. below, what is the displaceme:15uwdc-5md zg8jjq3h6ax wknt from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velyxop)(h6u+f,4 q qftj ocity}

  An object can have a varying speed if its velociikt)l6u 2, a65 n655syymic ni2ktit yty is constant.

  The velocity of an object can be n:i6) jz2wep.sy9qyigegative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must havs sq0mx7 y:cf34k bi.ye a greater acce740xyms c . :sb3qkfiyleration.

  Two cars emerge side by side from a tunnel. 7 t/r37r1komx54;y qhvnfv rkCar 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*+q; t5q dgukzw v-h,d its acceleration decreases.

  A baseball player hits a foul b,epv2g e-pwvh8s 6art: y.2rw all straight up into the air. It leaves the bat with a spvrh p6 .tvr,wp82:2sewya-g eeed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happening to its acceleratwj0ip e1:cl u0en3 m+yion, how does it change if air fric+j0ymnewc : 1i0p3uel tion is ignored?

  As a freely falling object speeds2,oq(un x 6 ewrmag1b/rbs6.b up, what is happening to its acceleration, how does i e( a /,obgrnbx.1b6qws6umr2t change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward,i;j*uie9zsc6susz6dd/ p00 hscr+ g will return to its original position with the same speed as it had initially if air resistance is negligible. If air resi0d+c0 i9/, 6ur6jdsezshpuig sscz ;* stance is appreciable, how will this result be altered?

  An object can have zez dz 7n/w xl-srd. g* ;zg79je9vin0krro velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the samzs e0-ac;; hgkzd8nk 5+ hb,ame time.

  An elevator moving from the second floor toduyg v*;3dlq 8 the fifth floor making no stops along the way has zer v*dg;yq8u ld3o acceleration all the time.

  A rolling ball moves frh8c.4bsqu2sa cc8r6b 19 lbolj q(4ofom $x_1=3.3 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.1 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laphehql;+: /hkd1jrt9o s around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.2 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, movink px8xzly9wq(10f w*eg 87 m away in 12.2 s. It then turns abruptly and gallops halfway bac9fwxpkzq8 wy(el0 *1xk 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 from3e5 4cxhg61s sx(h qrz s3ufh( $11 \; m/s$ to $24 \; m/s$ in 5.9 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.(*6nsk 7;+ u(qoetwqttmd5jj) z 8 vtpb tc,v $15 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachfwpu l(2;*gw s a speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst ju.8ut(f:miq)zja +e (d9 s (lvtzz x-out of the blocks to essentially top speed about- 8 jzxzt()f 9 .sdjuvt:(e m(qlia+uz $10.6 \; m/s$ in the first 11.6 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 spe f k 1u,egd8*p3ragtc+ed of $17 \; m/s$ to rest in 4.02 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(x1zf uvt0nu d,,f1yk he highway. Assuming a decz0 nx,y (fu1t,1ufvd keleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gotf3q xj1c o-b/5db(fping $25 \; m/s$ 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 comp3r).f rdtkgroizs1q c4p81r *lete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 irs.8rk1 1z)f4p*rq 3crtg dom to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$