Suppose that an object travels 18s2 dgb+vk aylj3d5s from one point in space to another. Make a comparison between the displacement a ddas1285y3lvk j+sgbnd the distance traveled.

  When is the average vellfnsq8sl4lde w::l*-c:r8 g kocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 8op6 x/sex1m zvvz,n0,gv6f .m s". This is a descripti6,1xz ozx .0pmvfs/6ge vmn v,on of

  An object moving in the +x axis experiences i5+ -4ed ;kb)fsswiyljoj qh-u 77as;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 sb2a ,e;wdtmpsv c ir.k7h ,a3;low down as it approaches 7k.ahbp,er ma2w i;vdcts;,3 a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x dirpja*./ m es+ioection) begins to slow down as it approaches a traffisa .m+jo /*peic light. Make a statement concerning its acceleration.

  Suppose that an object is moviesw :(gr,:lgpvmye ;ghcbem8lw873 7ng with a constant velocity. Make a statement concw7 ,:v7elgwl8e(pmygc;g: r 8eb m3sherning its acceleration.

  If the velocity of an object is zero, does it mean that m/jq fxb7 dxgg6o f/i6 z6g;3en8(jb +qhyk4 athe acceleration is zero? Support your answer w8jj7i x6 ay/ g 6 /+e6bho3xzgfq4knmgb;d(qfith an example.

  Can an object's velocity change direction when its acceleration is constant? u-6ey(sys/q5i1 9 h.i q dpw sap/vrh)Support your answer with anyayss(h 6r1s5iph9uqw/d ).i-/q pve example.

  Suppose that an object is moving with constant acceleration. Mapf zb3,;bq.fvsdxb- c s:w(q-ke a statement concerning its motion with c-bfz.-svsbpf(;d:xw3, qb q respect to time.

  Can an object have increasing speed while its ) p-2b 3p ibiofb/hy9.iocva3 acceleration is decreasing? Support your answer with an ec/3 py.ibb h9oai 3v2)p-ofb ixample.

  Suppose a can, after an initial kick, moves up along a smooth hill of icek5l* 9 iunrf8m. Make a statemmfiu5l89*kr nent concerning its acceleration.

  Under what condition is average velocity equal to the average of the objectusojy9aa5)vc 2 cc -bb*/y ks6's initial and fi9 jc oa/)yuck*sa 5bby2cv-s6nal velocity?

  Objects A and B both start at 7z0glvvamipe70c1k ;6t2jcp rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is th a0ivklze 1pv7mjc 72t;p06cge final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accewxb snm/i(8zlku29 sb8(i (w,ejs m:h lerate at the same rate. However, object A accelerates for twice e(bsh ziuwi/ 9m(8(8mxsln :w,2s bkjthe time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence0pzed8vs:9+xj 6iyi r of friction, which of the following is true concerning i:rz+6s0epi8 vyx9d ijts motion?

  When an object is releak(jli oeig24 7sed from rest and falls in the absence of friction, which of the following is true concerning its eik 4(ilj72o gmotion?

  Suppose a ball is thrown straight up. Ma ,n yoavkem rt;:j*q:p0yb4plq bh,ai -26 +mkke a statement about the velocity and the acceleration k qen,vb0-*+p6rkylima;4mt:q2ao,yhj p: b when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before itmvyq /oi,9-o id7o6o k reaches its higid7 iomoy6q-kov/,o9 hest point?

  Suppose a ball is thrown straight up, reaches a maximum height, theniwhoru:j,-.- .h mgu a falls to its initial height. Make a statement aboutou mh:-.w gai.hr-ju, the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straigh+aw4*nb;4 21+ bkhr obyb7s0cbdfa mit up, reaches a maximum height, then falls to its initial height. Make a statement about the directi0d s1 bb;m2n4*+ryoa+fbb7 hw b4cika on of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of airp:( 5r-+hp nvwruo (sr resistance. Make a statement conhno r(vsu+(w : rrp5p-cerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratnmqz5o(ch3wy* bo n3( ion when she she reaches terminal ve ( 5c3nbowynm*zho(q 3locity?

  A ball is thrown vertically upward with cf/ yf cl6txg; ,v5os(a speed v. An identical second ball is thfl(gvc6/ otsxy5f c ;,rown 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 higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buildp(xqt/0u0w*yf +u 1b djr2au ging. One second later, ball B is dropped from the same building. As time x(ruf0w qt/ +du2ya1*p jubg0progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is drop0(i:7ldl0hliki m, zv ped from the same building. As time progresses, the difference in their speel dh0l lm(0zk,iv7i :ids

  Two objects are thrown f:ssrd a*8osnb.q 7g76 nhs,dvrom the top of a tall building. One is thrown up, and the other is thrown down, both w7*s,7.soarn gs 6ddvb: qnh8sith 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 bkw hj7i)* 8hfgrick is thrown straight dow7)*8wi khjhfgn from the 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. Th3v:jcoe95 7 h0pjjzdse position vershp70je9z3s5d : vcojjus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The pon;g5fsx 44 agrsition versugfag snr4 ;x54s time graph of this object is

  An object is moving with constant non-zero velocity in themwg: 2is1m9 qn pws9c1 +x axis. The velocity versus time g2i9:q pmww1 sm9cs1ngraph of this object is

  An object is moving with constant non-zero acceleration in th j10qosehog8d/ v cniq2 f2-/wrj7sunnj0 u(0e +x axis. The velocity versus time graph of this object isi 0 g 2jfwrsnh702queo cn s8jdn/jv(o0q1-/u

  The slope of a position versuz;,wo49re b hxbiv,+ ds time graph gives

  The slope of a velocity versus mgq2o8q-* c2g/i gy fztime graph gives

  The area under a curve in an acceleration versus 7/k xtemf,6(mv4mhv 4wy x1lrtime graph gives

  The area under a curve in a velocity versus time graph+ewy11gr wvpn7e(*g v gives

  If the position versus time graph of an object ,icii )rtacee/kk:; 8is a horizontal line, the object ici;re)taici e8 ,k:k/s

  If the position versus time graph nv -yd;2aj-zz i4i/pr of an object is a vertical line, the object is/a y42rn zzip-; -vdji

  If the velocity versus h,v2kzn vb.n5 time graph of an object is a horizontal line, the object v., hnzb2v 5nkis

  If the velocity versus time graph of an object is a straight line makinffq(j 4sd 7buz/yr p n-9bds(7g an angle of 30 degrees wit7 /7-yprbb(( qfz9d4 fnsjus dh the time axis, the object is

  An object moves 15.0 m n-wprm 5 wa:n2iorth and then 11.0 m south. Find both the distance traveled and the magnitude of the di -a:pw2irwn5msplacement vector.

  A boat can move at 30 km/h in still water. How e;ek*c:t oxr, 8 .zsv y9yxoik5f13emlong will it take to move 12 km upstream covyk8r ,ekox *zy:.5 ts ie39m1 exf;in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? gw,c s r a)rw)o+xf4uk2/xbe8 (1 mi = 1609 m)

  What must be your average speed in order to travel 350 8 hoqt6yy 6wfn iwh+9*)droe3 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5/d de dpq1:j8 s/4/pk yhwlmv1*rxn w)7 min. What is the average speed of the :w8//m1/4wdpnx r qehs)j yvl *dpk1drunner in m/s?

  A car travels 90 km/p9u:wf etei0;; d f; a 0kxj8-puqz4bah. How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light tk;)3 nyg9j(h hn 2wl ,txpn*uqravels in one year. The speed of light ixpnh2h;*n(ql u9 kw3nyjg t) ,s $3.00 \times 10^8 \; m/s$. 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 ;7,(mt3b3fc xaa iudca straight road and you look to the side for 4.0 s, how far do you travel during this inattentive perif tmcc3u( 3db;ia7a,xod?

  If you run a complete loop around an -b hvmfk, 6azu g21:jioutdoor track (400 m), in 100 s, your average h u:a1m-,fkibg2zjv 6velocity is

  A polar bear starts at the North Pm0.. rbe4e:ake arbax8)ndk* ole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average spe)eban8b.dr ae:kxar04k * .meed?

  A polar bear starts at the North Pole. It travels 1.0 km south, the s)0bndexdzy+p ;q, 4jm*nkxif h+d6:n 1.0 km east, then 1.0 km no:ymk hqd46zi f *xn,+0s;n de+dx)bpjrth, 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 home oy heb-usmx5gi n1ai0rn/d z 0ro-b3 5)n a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is zxauhn oy i0gbbd3-sr55r/mne0 i) 1-your hometown from school?

  A motorist travels 160 fb3)k in95l.5yx;z y8 fndfbakm at 80 km/h and 160 km at 100 km/h. What is the average speed of the.y nn zifl8 xbffya593bk d)5; motorist for this trip?

  A motorist travels for 3.0 h at 8jybr-,7 9+hm glu,op p0 km/h and 2.0 h at 100 km/h. What is her average speed for the tri p9p+- joguhr,bmy7l ,p?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250bejn.n -az*)c*)y1o z.kctix mi/h north for 750 miles. What is the average speed *kz iyc.nn1*)j c) za-txb.oefor the trip?

  In a 400-m relay race the anchorman (the person who runs the last 1 jk4dd 4bkq4; vniz45xj6 z5rf00 m) for team A can run 100 m in 9.8 s. His rival, the anchod6z djq45xj;vbr4k4 4z ifnk5 rman 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 race?

  A car decelerates uniformly and comes to a stop after 9 s. The0k ffnu nnc2mu7h5i. 1j.bf9 y2rv1iw car's average velocity during deceleration was 32 km/h. What was the car's deceleration while slowing dow 0ykwuihum fn f r2cn1f.297inbv15. jn?

  An airplane increases its speed 0bk:f4jbz j/a from 100 m/s to 160 m/s, at the average rate of /j k jbzb0:a4f$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h 4yhdt:5/9q. +y c fkk:ceomqg c4dj/daccelerates at the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerate*ylr h 168qenrs 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 t8 ce 2 dk5i:n9e6n5nhuvgec5 h4cqpb5hen speeds up with a constant acceleration5uh kbnc 55iceevqeh: 5g69 2cpd4 nn8 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 6.3 m/s experivk94: ym7nig7,./wtzh 2)o lo hogypgences a constant acceleration oipwk4:g)y m / 27ggzol 9.7 hhvoyot,nf $4.4 \; m/s^2$. What is the cart's displacement during the first 8.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed or oek w+uo3m 00v7y+bnf 269 m/s strikes a sandbag and penetrates a distane o+k03w0+rmo7vy b unce of 52.01 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. 0:50 oeuq+pkorks65uzohkyr0r7 m2 v It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Ayek5h0o r0:zqu+6kvm o7spro5 0u rk2ssuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest)f+v6mu dd d/l2ao51 d7cn 0 ahlq:fgv moves with 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 1qnnt6j pm2ts,0 m7po80 m/s in a distance of 200 m. What is its average accelerati6 tmtn10 jnp q,s7pom2on?

  An object starts from rest and undergoes uniform acceleration. During t7lpx,dg u1uv0he first second it travels 2.6 m. How far will it tr,u 7pdv01guxlavel during the third second?

  An object is moving in a straight line with constant accelerau 4a 4f.asrj7bg op4y q i)d45dyde52xtion. Initially it is traveling at 16 )ro4u bide4y 5pg. df42a45jdaqx7 sym/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniform xr,*v+f0s :g2qlr btip5 p:hvly 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 deceleraac-dyviw0 8ag9ct 7-yf 5p3uvq- gs n5te 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 l4 .g+prsua n gq*v00xeight turns green, a car that has been waiting at the intersection starts ahead with a constar pxvn0 e+.gq0gasu* 4nt 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 whtv729kg l7m ehere t7evlm7k9hg2 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 es-r/1ib.9 te)zsx 9u*;mi) sqxgp wrof planet X where the acceleration dqr1m)i. )se iss ;9t e/r g-pzxu9xw*bue 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 wi/zc0v: 6f +ia s4k g-ezitp2sith a speed of 15 m/s on the surface of planet X where the acceleration due +-gipk0a24 ez its6vc z:i sf/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 km pr52+d y13puq :na .fou-u6u(ex y6grlez( the surface of planet X where the acceleration dnp6uurxq3k dr.:2fou p+- azyly6ee1u m 5 (g(ue 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 :* ,kgykse9jzfriend holds a ruler between your 9jgsykk,* e: zfingers 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 y3c4n b rs:zo:szw 00c)snf+lof 19.6 m/s. What is its velocity after 3.0:3rcf: snl) +yo zs0c zbsnw040 s?

  A bullet shot straight up returns to its starting point in 6 s. What is xh dhcfg,98ddf7(dxpa ke r53rz ; 56ythe initial speed of h3pk86 d drzyg(xrh 5,fa e57d9xfcd; the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it851 4au :v3oem wfrzps take to rm rzv f3 85p1u:saewo4eturn to its starting point?

  A ball is thrown downward f8i xnc -p3a*wfz 2ckp4g*5dbd rom the top of a building with an initial speed of 17 m/s. It strikes *kfc5 2*8w-gpnbdd4 cpazx 3i the ground after 2.9 s. How high is the building?

  A ball is thrown straight up wi*aj)kls 1ijgxv))v/eth a speed of 30 m/s. (only fill in numerical value ivsge )/ )*vjk 1l)xjian 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 witushg )a (8a;mv-dm bv.h a speed of 40.1 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 10 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocit79k(ffg p*6msjpjl 3jy at t = 1.0 s?

  In Fig. below, what ilclg:-+6 +f- flhnz dfs the velocity at t = 2.5 s?

  In Fig. below, what is the velocity 7- gyp h5murbr4u1be*at t = 4.0 s?

  In Fig. below, what is the v/84pjwk g;u noelocity at t = 5.5 s?

  In Fig. below, what is the average veaer l;13hf)-+ khlnalyoo y 3-locity from 0 to 4.0 s?

  In Fig. below, what is the1twmk,2y ojs6 rs0.e v average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 t3+0ah 3soenu(7sgj m s?

  In Fig. below, what is the acceleration sdb k1 3rtexxk*ct0*) at 3.0 s?

  In Fig. below, what is the averagevr0)(axlm :jdva c).p acceleration from 0 to 5.0 s?

  In Fig. below, what is the averag mzvi+lzq+ wou+5nw+jwu :zc3 01 . kug9cor+ie acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement fromfbg(s/ty; 2rg 0 to 8.0 s?

Does a car speedometer measure speed, velocij*( 7xycxk -mhty? {speed|velocity}

  An object can have a varying speed ia djlcjyg37q+ o,v/ 2vf its velocity is constant.

  The velocity of an obv*w7af t0r6sc ject can be negative when its acceleration is positive.

  If one object has a greater speed than a second objecti)-se v tx:7(aa:xz egtrns.v. - wq9f, the first must have a greaterawa. tzrxg-:i-7e: t .enqfx9 vv )s(s acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a .dqcej9va5 u 9speed 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 wrne uhm6do g 2-l12-idecreases.

  A baseball player hits a foul ball strahd.j y+kf(r*c ight up into the air. It leaves the bat with a speed kfc*dyr .h(j+ 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 objilgh(p :acl+w892gwbv lk3: fect speeds up, what is happening to its acceleration, how does it change if air friction is igf:9avhk+8 32pclgll iw w:b(gnored?

  As a freely falling object z:-r6; g cmyitspeeds up, what is happening to its acceleration, how does it change if air fry:ci; t6- gmrziction CAN NOT be ignored?

  An object that is thrown vertically upward will re-cv s9;hky1+mrpj ru7 turn to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how wc9hjkrr;7 y vm1 up-+sill this result be altered?

  An object can have zero velocity and nonzero acceleration at the samf8ug740nk6f h m0m 6qst ttlfnxf4g) x)6 ,inse time.

  An object can have nonzero velo,pf.6mdis7s av1 tu 2a1de fdu02jfq9city and zero acceleration at the same time.

  An elevator moving from the second floor to the fiftr2(/2 zo26 dbhp erwkm38ifanh floor making no stops along the way has zerdi (/arh2k moe86p2b3 nr2fzw o acceleration all the time.

  A rolling ball moves from32rr/ v kcib9r $x_1=1.7 \mathrm{~cm}$ to $x_2=-5.2 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete p myyp gm8)qzm spvl6+o,c-*n/*eiu/ laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, moving 106 m awayy d:q4 k)l,uwi;d(rfp in 13.6 s. It then turns abruptly and gallops halfway back in 4.6 s. Calc kl) ;ywdr(d: ,qpu4fiulate (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 mx im72/khpu 4$10 \; m/s$ 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* dmu-1-iij5nu /o-zoqmy- jf $20 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a :xt hac* ev a8n/ka-q*speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst outwl4-l bv v7+jf of the blocks to essentially top speed aboutv-j+lbw vfl7 4 $11.3 \; m/s$ in the first 11.3 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 uniformly from a spee +g72vcuiasa6d of $17 \; m/s$ to rest in 5.38 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 lebcifi00 1/z2 ,txhq on the highway. Assuming a deceleration o0lih1f2 i bz qte/0,cxf $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going ntf c7 f.e fn+i22*yqi g*wqv4$25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m hy +jtggxb8) *run in less than 30.0 min. After exactly 27.0 min, there are sty+)hgbt* j8gxill 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$