Suppose that an object travels from one pv wpg1sok;zyy1y(k r /8cb8 n+oint in space to another. Make a comparison between the displacement and the +o ;b1ky/gnscz18(w 8yvkyprdistance traveled.

  When is the average velocity of an object equal to the instantambl1o c rl21;xneous velocity?

  A new car manufacturer advc+ qpg um i*y(f02gy,pertises that their car can go "from zero to sixty in 8 s". Thisp +,m*gyu gf(02 qpcyi is a description of

  An object moving in the +x axl0daumbkf0)1+r l 2 uois experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down ass,+bz :ty2aevv5 hv re0/xgb+ it approaches a traffic light. Make a statemenh g0bvvyex :z2s/ te+v+r5,abt concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to soso r2nkt6f-r zgyxzb.+ .3u0low down as it approaches a traffic light. Make a statement concernif g2btr3x- kzu .yo.0szo+ rn6ng its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemep5f 7hlzl+scom0 ) -aont concerning io0f5p )7ls c -hazlmo+ts acceleration.

  If the velocity of an object is zero, does it mean that the acceleratiovf wmuudn:a8)af/ *k3a0w 0lfmp4r *a n is zero? Support your answer with an ) md*uln 0 p*vf a0kamuf8w4ra/wfa:3example.

  Can an object's velocity change direction when its acceleration iss k5mq+0c0vg4iqk(p g 1 .qrka9 qpir( constant? Support your answer with an ex1g0ci+qr4vgp (qk prmaqq k (i0k5s9.ample.

  Suppose that an object is moving with constant acceleration. Make a statemef:lunvaot8qd.4miq 7gv i *36(n eez2nt cdmve:* z8qtgn2.7nof laqi34viue6(oncerning its motion with respect to time.

  Can an object have ino ols8rdft.y bpjz n+ 10-v1z+creasing speed while its acceleration is decreasing? Support your answer with an e +1f 1nzjb0+t.l pd8orz -ysvoxample.

  Suppose a can, after an :o 6dzrzw eh:n5-+;ebyvcz, minitial kick, moves up along a smooth hill of ice. Make a statem:ry5d,z no v; +bw eze:6hzcm-ent concerning its acceleration.

  Under what condition is a/6m(e1wjl4 l kumrl/o )zhwi8verage velocity equal to the average of the object's initial and finalw(/l klm1)o8lhrzuim4e6jw / velocity?

  Objects A and B both start at rest. They both accelerate at the ssp5mbvt:d, o(q ss 3*same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objec (3qptds*ms s:osvb5, t B?

  Objects A and B both start from rest. They both accelerate at the same p.nhqod-)a4g rate. However, object A accelerates for twice the time as object B. What is the distance traveadgh n.-p)qo 4led by object A compared to that of object B?

  When an object is released from rest and falls izx, 9rj9 ( o:jf:c1igv3pcn qdn the absence of friction, which of the following is true concerning1 q,:9 poc(vnzxj9f:i g dj3rc its motion?

  When an object is released f. cr9w,m9cl ir.k4c tbrom rest and falls in the absence of friction, which of the following is tm.. c4kbr9 lw, ct9icrrue concerning its motion?

  Suppose a ball is thrown straight up. Make a st(ov 9 i r7zm;tk07dzptatement about the velocity and the acceleratio 7kzmd0t 9opz;(r7tvin when the ball reaches the highest point.

  Suppose a ball is thrown straight up.vmj0s+ 17lf 5abxd)bi What is its acceleration just before it reaches its5im 7) d01bljvabxf +s highest point?

  Suppose a ball is tht x2on+t yr 41ygfk80ha1z x4frown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going gx+8f241 txfayt yo hzk4 n01rup.

  A ball is thrown straight up, reaches a maximuxw v1 r(rgiax-;w0dhlrjf* l b96r;r/m height, then falls to its initial height. Make a hrjxwbr9; */ l -d;vrrr6l(igx w0fa 1statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is throw,9 frg 9fexct1n downward in the absence of air resistance. Make a statement concerning its acceleratioc e rf99xt1gf,n.

  Suppose a skydiver jumps from a high-flying plane. W :wpv /s8fbnz;k +aowu+7+15myps gxmhat is her acceleration when she she reaches termig+ms+yvw sp5/o8 npx7a+ w bmzkf :;1unal velocity?

  A ball is thrown vertically c nxet( 7j7hw*upward with a speed v. An identical second ball is thrown upward withhjxe(77 ct* wn a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the t/v y7b3(dwo s8i+eefffdt(m, op of a building. One second later, ball B is dropped from t8eif ,3vwmt/+sd (obd(ffy 7 ehe same building. As time progresses, the distance between them

  Ball A is dropped from the top of ai2ujf+ +4w(8smf bq-:mus aba building. One second later, ball B is dropped from the same building. As time progresses, +f m(2 8q wmjuu4sa-ab+:fbisthe difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown upsefl i+5a2 op-, and the other is thrown down, both witheila- o5 p2fs+ the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of lw+k0 wqupx 3doe2x24s 7.1 ircohn*ga building. A second brick is thrown straight down from th s .1*g7o0ocdp 2lwx4inwu kh 2er+q3xe same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Th y m g8894 djvptnb1p7gbxlc*v*0p)oke position versus time graph of this objx4dmytk087bncv8lb g*g pv 9pj* po) 1ect is

  An object is moving with constant non-zero acceleration in the q,wu m5u t8t:1ovuv*b+x axis. The position versus time grat5 omb* vuq u8vw,:1tuph of this object is

  An object is moving with constant non-zero velocity in the +x axis. Thekq619pz n8fys velocity versus tzy1skp8f69q n ime graph of this object is

  An object is moving with constant : 6a4xg 6mhwly m:;qjonon-zero acceleration in the +x axis. The velocity versusg6qmhja:yw m;6l: 4 xo time graph of this object is

  The slope of a posit xbo w6 /x3oy3+65veghv8qrz dion versus time graph gives

  The slope of a velocit.1c;u;b ngdhay versus time graph gives

  The area under a curve in an acceleration versus time gr )jrcz: nx76 a)sey;dzwxa2iq rz4 6+lfpzm67aph gives

  The area under a curve in a velocity versus ti78b tia e5sv:ame graph gives

  If the position versus nk-o zw0p 4s2.m)/ vzax7k jqltime graph of an object is a horizontal line, the object ip2 q z0x.4z wj ks/vonkalm)7-s

  If the position versus time graph of an object is a vertical lv(b e0,.olp w) wd/pizf ,qu zxjghy/+/ el3)aine, the object isw (v,)l fh w+ / qd,ap3jupzxy z./bo)iee0l/g

  If the velocity versus time graph of an object is a horizontal line, the e-- oh65o cfdos3eg+v0iw6wkobject is3vsg6 d5-o wecio6kef+oh0w -

  If the velocity versus time graph of +9.+o o 3ov7uyhlhbzhan object is a straight line making an angle of 30 degrees witu9hol +3yo v z.hb+7ohh the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sof- hb6l3f/1b.a jbtlzuth. Find both the distance traveled and the magnitude of the dlah31 6bfj- lfb/zb .tisplacement vector.

  A boat can move at 30 km/h in still wate 0p+lbibm0z 2zr. How long will it take to move 12 km upstream in a river flowiz0p+lzm2 0bi bng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi :q(sy*+d pz:byim5f0t2*pw4 mpy *yhd5deel = 1609 m)

  What must be your average speed in order tj1:3q chxuu p5o travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whatq 26nfjjw7 5aqek0t:f is the average speed of tqn706 wf a5 efkjqj:2the runner in m/s?

  A car travels 90 km/h. How long does it take for1al6*bt8ze*zp/e3. bp +o uja+uwvw h it to travel 400 km?

  A ly (light year) is the distance that light travet11 6.q*vh 7h zijyfgels in one year. The speed of light iti 1.jfqvh*y1h 7gez 6s $3.00 \times 10^8 \; m/s$. 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 tlx+kaqwg* h1 0tjv8 uyb)9ek ket a;5:he side for 4.0 s, how far do you travel during this inattentive th 8*uy:tb lqw+ e5axg;aek vk j90)1kperiod?

  If you run a complete loop around an outdoor track (400 m), in 100 s,j; /7 ,rjstgbm: +t(otzx 4otx your average vel;bx,tt/r ztx+m4 (s g :j7ojtoocity is

  A polar bear starts at the North Pole. It ) )stil fwlb/4travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starttfb)/)l 4il swing point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pzi(ljpa57f* 0 x(y-cqb0v bmnole. 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 mibz50 jmla0iv-bnq ((*x7pfcyn. What was the bear's average velocity?

  You are driving home on a weekend frogor r0tq8,3dc hvfc g m5j9+n-m school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive homn9+cr-hgjfo, cqd3vtr5 mg 80e 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 10upzo-5l9 , ylqtaa9x+ 0 km/h. What is the average speed 5palz9 taol-x+y,9 q uof the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h u )u;nygi fvm-wnxr/ ;nr3 a69at 100 km/h. What is her average speed forf)vn6yru3ix a-n9m n/;gwur; the trip?

  An airplane travels at 300 mi/hozms 3 02eq+ee south for 2.00 h and then at 250 mi/h north for 750 miles. What ise+0oq3 em2 esz the average speed for the trip?

  In a 400-m relay racat l x/6r*; 0 kv4zpx6qkbnf;je the anchorman (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 *;fr naqj xk4bp/6vlz6xk ;t0team 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 comes to a stop after 10 s. The car'1q-h2g prew 2 ma9/rg2iv.wz7x r quq4s average velocity during deceleration was 75 km/h. What was the car's decele7qgprm i2 erzq1 .a9r4wh2-/wuvgxq 2ration while slowing down?

  An airplane increases its speed from 100 muz d234cloiu: /s to 160 m/s, at the average rate of odc4 2li3z:uu$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of : n--06xv3ig qmagnzl ::qbrg$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and acc(wgrl ww5j:a+h dexn6 q v+48 wy/n.trelerates 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 conw3eqx)(dqr/9j 2 mv gk qkc+a)stant acceleration of kjaw3 q+c 2x)r m( 9)qgedv/kq$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial v* je ta9-qj.bx/ ze.eaelocity of 2.5 m/s experiences a constant acceleration ofz je.ae.j*qt/ae9bx - $1.9 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontally to the ri, d5 s17mhhl-xg3;x vv;8fex u9mrucvm+ 6rfzght (+x direction) with a speed of 293 m/s strikes a sandbag and penetrates a distance of 16.46 cm. What is the ave 59u m3 xml; ueh1f g-sxf8v+6m,hcrzxrv 7v;drage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carriek)moi 5fj)g ,kjobkpa- ax-9+ r. It reaches a speed o )-ajj) go -5koikm xafk,+p9bf 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 acceleration f8 t(qnc5(xcge3bg)c 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 q /i6 qkrr.*miits average acceleratir6ri*m.qiq /kon?

  An object starts from rest and undergoes uniform accelert-ag)w 6w, hh41v ltrwation. During the first secont1,) hwh-gawr6vtlw4 d it travels 3.8 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleratio/uf,lwqpijnl-tzz/7yq m ,,6eau7 d 9n. Initially it is traveling at 16 m/s. Three seconds later it is travelin9zu6wmqdi l, ya/ -tzp f ,/uje,n7l7qg at 10 m/s. How far does it move during this time?

  A car starts from rest and accu;z+aya0g)vr.u.l lh elerates 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 decelerate at abouk+*x ,asnfzx7uxzq4 -9p2cxk t $5.0 \; m/s^2$ 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 that has been waiting at p l(6,qwti wfrqgyf:( 9e ao4,the i(q,lfpo6wr(i fw:94eqyat g ,ntersection starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with3,; czloykl4 ck+95jdl il.d i a speed of 12 m/s on the surface of planet X where t45;ldli+ 9o3kk jlizdyc, cl .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 witho2 y+pd4)zt xj a speed of 12 m/s on the surface of planet X where the ajxz4 +)yot2p dcceleration 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 mxz+sl44vc 9)9cg ,u- dfjuxn q/s on the surface of planet X wherun),q 4+vsxjz 94d lc9ucfx-ge the acceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the su 94*u2+ai kiub,l4lbppw s gu0rface of planet X where the acceleration duew*09u lua pgb4,u2 i+pib4 ksl 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 your friend holds ,h9 8e w fhd-4f7v*xc8 vhkd9yafpn-p:mcjj4a ruler betweefdy7h4v8wxv9dh j:f*4 cp-c 9h epjf,mn k-8an your fingers and releases it without warning, 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. Wh ci- ww :yc8ot/,4f-jmc /3x7bgsfcheat is its velocity after 3.00 s?wf w8m7h ,ccct gy4/ oe-/ix3:sbc f-j

  A bullet shot straight up returns to its sfc0hu cfco 12v0x6f zm4 ue0j*9l.xf jtarting point in 14 s. What is the initial speed of the b9ffuj0zumccf 1j xx0.c*lo hf v460 e2ullet?

  A ball is thrown straight5yt6ms- dq(fg up with a speed of 36.0 m/s. How long does it take to return to its stf dq (m-gy5ts6arting point?

  A ball is thrown downward from the top of a building witx9bg9+j +qfolor9we 2h an initial speed of 8 m/s. 2q+w9 g99f lejb+or ox It strikes the ground after 5.2 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s.s*ruh4 obixfa13; u/mn+t7z i (only fill in numerical valuena1h73i sr/fbx * ;it uuoz4m+ 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 24.4 mjk hbp t02hx 9vxs1je,b5d1 0i/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 1 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 tw2w2-f uv v9fb 8t(bzz = 1.0 s?

  In Fig. below, what iyn9 nk04heu -vt3sze1y8 w(hv s the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t =)m/*lb xb hcr8bn cc 9z7f)rm4 4.0 s?

  In Fig. below, what is the vevfu3o0la *+v4 1eo woolocity at t = 5.5 s?

  In Fig. below, what is the average velocityr3*cs 4mz 3xth. 3btdv nepi41 from 0 to 4.0 s?

  In Fig. below, what is c3 t4 z/xwrd7mys(5 t *fs/lxpi 2qgg)1:ebpqthe average velocity from 0 to 6.0 s?

  In Fig. below, what is thetg4j mxtg9 o4cgeb6, y :+ft t0ptf*l7 acceleration at 1.0 s?

  In Fig. below, what is thl )lit/g ;d;t ak(/rkee acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s?rm9/9kw:h( wqrk( ybq

  In Fig. below, what is the average acceleration from 0ukz1/o6s +mdr a(*z9by4s cor to 8.0 s?

  In Fig. below, what is the displacement from 0 t)/ u0ax4yp+9os gcm fjo 8.0 s?

Does a car speedometer mews2gqcd -h2b2 ztnp)- asure speed, velocity? {speed|velocity}

  An object can have a varying s dk2kmr- psiv :r;m,x8peed if its velocity is constant.

  The velocity of an object c u pdrx/((9meaan be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the firskaq 0g5 4.26yt lwnoslw)eq1qt must have a greater accya6snok0ew )1l2gq t.5qlw q4eleration.

  Two cars emerge side by hjvt rt(35pzu+w, c(i side 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 acceleration )kifo-97q;iv(hh qb(cg ue n xx.i ,m*decreases.

  A baseball player hits a foul ball straight up into the air. It leaves ;/n qjnj(j1))zz- tni im gc0nthe bat with a speed(tn/ 0 zcnj n-z;)gjmn )1ijiq 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 acceleration, h07swff n2+i -rz z*lkuow does it change if air friction is7i+nf-zu2w z rl0s*kf ignored?

  As a freely falling object speeds up, what is h*rx-ljk 3zu 4rappening to its acceleration, how does it change if air friction C-4*urjkr3xlz AN NOT be ignored?

  An object that is thrown verticc;zglfevb 2+m40kh t f6g 9i.hally upward will return to its original position with the same speed as it had initiavtbcf+; gfg9 6ez0hkh. 2m4 illly if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the sam 8rugja(0v.v/aryp .ie time.

  An object can have nonzero velocity and zero acceleration at the same timezuj/m s8k9r gt:mn*5z.

  An elevator moving from the second fj;tc af/ -1tlxz (vx*cao*,bwloor to the fifth floor making no stops along the way has zero atlvxj,cacf oza*1/t (-w;b*x cceleration all the time.

  A rolling ball moves from y4l)qdfpv 3v8$x_1=3.2 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complej229x zydewn- te laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.0 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 linx e/x6e7td8rr76a lwve, moving 94 m away in 10.6 s6lxwev ta/7 8rr6 7dex. It then turns abruptly and 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 i rznor9pidtrs+m- s) *ui. o1h,/sa+$11 \; m/s$ to $23 \; m/s$ in 4.7 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; :z8ew z92k+ qyfoxbm $16 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachh7mol);)hc/ry nkjwg fe2q04 a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essesb; p;o+b)*vrta p4;amughk m a:l(5nntially top speed aboub(gmtml apb ok 5 hr+ps4a;;v;: )an*ut $11.1 \; m/s$ in the first 10.3 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 unifod:l x/h ii:u+4wh1tqarmly from a speed of $17 \; m/s$ to rest in 5.33 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a +t+0v a e6dcsrlmad-7car leaves skid marks 92 m long on the highway. Assuming ald 0r+s7dta6v c+- mea deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go 8g0 p4ekm)qlyi lu,t+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).    $m$