Suppose that an object travels from one point in space to another. Make a com. 2/sl1zu7 * ts hzicdm-xiv6rparison between the displacement ar26/cst u1xl*mz dszh - v7i.ind the distance traveled.

  When is the average +wsi+jjtoiex7k+7 8dvelocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car c pjf:u6v6l o:bky2v2qan go "from zero to sixty in 8 s". 2kb6yvj6 2q:fpuol v:This is a description of

  An object moving in the +x axis experiences an acceleration oe;,r yk im fk0bxd*b8h9a;4pnf $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Ea .d) (cje6tphist (+x direction) begins to slow down as it approaches a traffic light. Make a staj t.hci6p)( detement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins tqmqk+*/nca 2b9 ;aezso slow down as it approaches a traffic light. Make a statement concc*bq/k+2q ; a9neszmaerning its acceleration.

  Suppose that an object is moving with a dh9ky ;.f+phyconstant velocity. Make a statement concerning its accd9 hpkh+;.y yfeleration.

  If the velocity of an object is zero, does it mean that the acceleration isq0;x( jp-xcqo zero? Support yopc (x-q xo0q;jur answer with an example.

  Can an object's velocity change direction when its accelerationa*t0qff5mbf 2 is constant? Support your answer with an example. *25mqbaff0tf

  Suppose that an object is moving with constant /n0woldp ab ;eb1yr62xhqv ;5acceleration. Make a statement concerning its motion with rev/ e;ownqp1 yx52b al; 0rdb6hspect to time.

  Can an object have increasing speed while its accelerati6soj31ntsxg m u34dm;on is decreasing? Support your answs6o mutdgj3 xm 341ns;er with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Make b/v.3s2orcxcidlj * 0 r i*sdb02l3x. oc/cjva statement concerning its acceleration.

  Under what condition is average velocity equal to the average of t kygle w bh9283*uzq8ahe object's initial and finayleu 28*g98 w zhq3bkal velocity?

  Objects A and B both start at rest. The*3 *mzf(l7jdfurj5oa y both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is thjaz37(fu5orlj*d*f me final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerisrxpeq-t)xkl: e p-/bc04. bate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compar4brb p/ pq ek -ex:-)tcix0l.sed to that of object B?

  When an object is released fr81+e :ohfw tvdom rest and falls in the absence of friction, which of the foll+1e wvdh8 ot:fowing is true concerning its motion?

  When an object is released from rest and falls in the abse;hop :+yf6nnd nce of friction, which of thyp;+6o d: fhnne following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the )6d whu*dd,x w u1)xvxvelocity and the ax)wx6*)d dvdu1w x,uh cceleration when the ball reaches the highest point.

  Suppose a ball is thrown straic;q obbg- 4j:j9ad g+rght up. What is its acceleration just before it reaches its highb+o ; jd9gcj: bq-4graest point?

  Suppose a ball is thrown straight up, reakw x2htz5s 9z)l om*b8ches a maximum height, then falls to its initial height. Make a statement about the direct9*z8 wz2h5bk osxm )ltion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxgt1bac1m;0w0l u 8wfbimum height, then falls to its initiaga 1fw1bwblm ct0; 08ul height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of ai,vca. xrt;c7idm:pt y-8a2 xqr resistance. Make a statementpd xx2 7y t 8,tvi:.mracqac;- concerning its acceleration.

  Suppose a skydiver jumps from ) hd zhji; hfczzfh.zt.v9 wzwsf/rn/d5,/,/ a high-flying plane. What is her acceleration when she she reaches terminw,rz.hfizh,f/.c //s9z thf/v)zzjnd ;d5w hal velocity?

  A ball is thrown vertically upward with a speed v. An identical z ie/ 1w.f(wnl96ksy0(f dtutsecond 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 higher does the second ball go than the firs1/y 6ftfksi0 tudn9wle w(.(zt ball?)

  Ball A is dropped from the top of a building. One second later, ball o8wex g hx6b,ih2s vgi 1*/n/wB is dropped from 8w ob/gi6/v*xxh ,ie w21sh ngthe same building. As time progresses, the distance between them

  Ball A is dropped from the top of a bu:1vn,0 ;i i(.d qdyxmx fznr:hilding. One second later, ball B is dropped from the same building. Axnm.:0;,df :idnhyvxrq(1 izs time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Ov g .ke(n9q.q3.f covzne is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the streekq3gz. qc (.f n9.ovvet?

  A brick is dropped from the to7f ma mmk5:ne lq4.ed)p of a building. A second brick is thrown straight down from the same building. They are released at tha )qm75 m4dnmfke l.e:e same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-ze.-ksdt4 r;onu mwo:: fro velocity in the +x axis. The position versus ti.f-4w;s onmrk :tdu:ome graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. T (5faryp ,)*;hfthh8fgkzhtv70) dn whe position versus time)akn0wyth,vh fp (*f 8g57rftz ;hh)d graph of this object is

  An object is moving with constant non-zero;e:0q q -a*ld8oy xkan velocity in the +x axis. The velocity versunx ead80:qokl;yq- *as time graph of this object is

  An object is moving with constant non-zero acceleration in the +xczi4 4-xft oa. li2n3 ,idy5ak axis. The velociio3dyf nxk2 -,4azl ai5 ci4t.ty versus time graph of this object is

  The slope of a position ver:e 8 wn6 ltq;flx*iwlv0 s pj(.5snxn.xl8(cpsus time graph gives

  The slope of a velocit:ujr::o yb oo;sz.wz 3y versus time graph gives

  The area under a curve in an acceleration versiu+w7/m8/ .cros nu d,yb/.gr* oil mdus time graph gives

  The area under a curve in a velocit6h9. 5dhpiv pyy versus time graph gives

  If the position versus time g v0-sd(-peqwu)1vc tcjq* 7b+ v/j nrcraph of an object is a horizontal line, the object iq/s-q0t*vbw7 nr p ()ujccdc- e+jvv 1s

  If the position versus time graph of an object is a vertical line, the objectx* ;tz jab2uir fycdj6my992+ isx2*2j z+u;r9ytj9b dm6iyf ca

  If the velocity versus time graph of an object is aak:0efith+rl1)g )a v horizontal line, the object )giata:h kle0r+ 1)f vis

  If the velocity versus time graph of an object is a straight lax;tew)q*m 2a:f sr y-ine making an angle s*;te)-aqr 2mx :aywfof 30 degrees with the time axis, the object is

  An object moves 15.0 m nort,uflg b-w l.ba q ) z,es:pfcdhffn66:wg*q7-h and then 11.0 m south. Find both the distance traveled and the magnitude )s-hf wwp6.nfg, gz7,*q- 6ll f:eucfq bd:a bof the displacement vector.

  A boat can move at 30 km/h in still water. How long will it8d kzu3em;m.1qgm2z rs vk2:v take to move 12 km upstream in a river flowingv kmm.gks8qz;2edu3mr2: z v1 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 160 l3 enkzf .xl.4f7vmf19 m)

  What must be your average speed in order to t5n) ne,nvyo 5qravel 350 km in 5.15 h?

  A runner ran the marathon (approximatfu .zq1x0n1jt xh4,g jely 42.0 km) in 2 hours and 57 min. What is the average speed oz ujx x0nfhqtg.1j14, f the runner in m/s?

  A car travels 90 km/h. How long vp4dk jac6;h93:erj2lh 1yhe )*bt vodoes it take for it to travel 400 km?

  A ly (light year) is the dim g; jzv2)yxt/stance that light travels in one year. The speed of light isgt/ 2 jz)xmvy; $3.00 \times 10^8 \; m/s$. 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 anzbx ,2dfkkpe-8e t3c 2zu nc9*d you look to the side for 4.0 s, 3k2xed ,2nbkzz e-9p8uc*t fc how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your a 9o9jgu/y37o dvy)ruqo,9lhlverar lhol y9gq u79uod39)jo/,vyge velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km uzz3 rn 8-+qhw;;fbg meast, 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 s3gf+;n m ;qr zbuw8h-zpeed?

  A polar bear starts a l 3/f-bi*d-m a)kcuaokn(zm8t the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 * oicu- bkm mdaln3afk/-z)8(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 for 110 miles. nop gvd*9em)f . 5ysk v3f ::zdf/cgf8It then starts to s3kg v :./) yfs5cenf g f:z8fvdpdm*o9now and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 4yj9 (9a pediykm at 80 km/h and 160 km at 100 km/h. What is the average ad4j 9e( yiyp9speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h an37ow7x9dpe 4 lbg.3qs 4ttfl3s ozk1q1a: xvcd 2.0 h at 100 km/h. What is her average speed for the tloxs4xv kb cs 9dzqg3 4a7.t1ow7pl q3te13 f:rip?

  An airplane travels at 300 mi/h south for 2.00 h o:ugn*+-ls 2cq aj;nj and then at 250 mi/h north for 750 gc:ljs nj*- uq2a; no+miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs 6 zzzp: e;u-cdthe 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 canez cpudzz-: ;6 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 13 s. The car's average vk)h62uimh: b0 -i ccptelocity during deceleration was 40 km/h. What was the car's dec) -bikc6mchh:t pu02 ieleration while slowing down?

  An airplane increases its speed frupt4 l6 5529wgqvbn kiom 100 m/s to 160 m/s, at the average rate of vn5 g6 4w biq9k2tl5up$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rat s7cu-bp/p3mj e 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 f qi,f 2(5uybcaccelerates 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 up1 96jyv3pq9u13hxnrmev 4miivnm sz*k ,63ek with a constant acceleration e1pi3vhmk e,q33rz1u 6x9vi4*9 jk sy vnnm6mof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.8 m/s experiences a f xlzev- g03(g,2f jq e)5m9ks qgmp*econstant acceleration o j3fk (qvlx, p*2qmf9e-50m zgeg) egsf $3.4 \; m/s^2$. What is the cart's displacement during the first 5.3 s of its motion?

  A bullet moving horizontally to the right (+x di0 8r,: kb9dd7ww3uqyorz8jk9) 7 kx w2sno ndbrection) with a speed of 293 m/s strikes a sandbag and penetrates a distance of 37.68 cm. Whj8n 7w028br,z9 )n dxwq7oo 9bds yukdr:kk3wat is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a o(c/3uwp. gpq 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. Assuminqup3/.g w poc(g the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration of9uop dnw4r nkdd6 - lxfd1pq7 9-dx3pw1-o -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 its average acrxv()j4(gji6f nb ik.) tznynyc6k0jtc9v/ 0cel9iy /k n n6y)r tj0gtk4.v0i(xj 6(jc)vfcnzberation?

  An object starts from rest and undergoes unif 8k:lwfmv * 8;:tnfyg8ucjv7noq *kz*orm acceleration. During the first second it travels 2vcuj8fyn*mgn f:7tq *88k o;lv*:kzw .9 m. How far will it travel during the third second?

  An object is moving in a straight line with constant accelerati(jxeyfa) q; ,xel8vl73 +atrwk w17qbon. Initially it is traveling at 16 m/s. Three secondx7 w8 (1wtq;ab),vqkl 3eja7ey f+rxls later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleratesxyg1da9kbv.x.zj b y5x9r7mnecn3 n n93m5 7h 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 tne.-) jn 2p35 w6 ltve:dyshi;akwvq( ez.)f a dry road can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light tur)vq0r qc12vrd.d; ud jns green, a car that has been waiting at the intersection starts ahead with a constant ad) vq1v.2 r;d0jrc duqcceleration 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 aq/c zia *ihs*7gj -mcd xf0;7o speed of 12 m/s on the surface of planet X where the acceleration due to grz/j*mcfh 7*d x;go7i0ia qc- savity 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 onbykm dy 9p-l 2.b gf;7*qyop5k the surface of planet X where the acceleration due to gravit25koyp.b bm7*d- l9 fyqpk;ygy is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on eun raegi 57,ko6-m2xg i/ h,bthe surface of planet X where the acceleration dg, b/ni2iee5m7go r ,xk a-u6hue 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 sur1h3qtowqqr0p( 2 )up*-uf gh mface of planet X where the acceleration due to gravity *1owgq hfmu32p )t(-huqr pq0 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 hol 9*x knoglcuy.f (gth8sxc c62n8o )w,ds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?ccs9x *ol g.k68, wfynnxg h2c)8otu (

  A ball is thrown upward at a velocity of 19.6 m/s. j zvm: e c q4umj3( vtry+fo+(6-:nqkiWhat is its velocity after 3.00 s?:n46qv mtjeo vrmf yjci(z 3(-:u+kq+

  A bullet shot straight up returns to its starting poilqbrvtk c( lisd . 0)lgtnu7 k(:o5:2wnt in 15 s. What is the initial speed of the bullet (unl:2qg.tks:l bt5crlwd i7k)( v0o?

  A ball is thrown straight yqhq 9aq91qx7vr r .wd142bnwup with a speed of 36.0 m/s. How long does it take tob vqq1x9ad4w27nq 9q.wy hrr1 return to its starting point?

  A ball is thrown downward from the tiqqy, ; a81.fz ub7llqop of a building with an initial speed of 28 m/s. It strikes the ground after 3.3 s. How high is l7zf8qlq .b,;iay 1uq the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill i;+:bf x 7bezz 9he2jbzn numerical value in the 9 bezz:7bh +z 2e;bjfxblanks)
(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 speejb:n+dzsqw. -j1 y-pvd of 37.6 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what i2u som;ui,y5q p 4a)rwg)i 9cds the velocity at t = 1.0 s?

  In Fig. below, what is the velo p w19 eydy 2fq/xwd3zo(vptw-),*sjgcity at t = 2.5 s?

  In Fig. below, what is fc t4z sc(+g4uthe velocity at t = 4.0 s?

  In Fig. below, what is te95s qype3 :r0wzzlz:6u2*zs(vz qz p0f-io whe velocity at t = 5.5 s?

  In Fig. below, what is the average vel:dvv- ajpt+wl8 7f )mvocity from 0 to 4.0 s?

  In Fig. below, what is the averaghidj(w y)l um-i i2zux2w4 )-ue velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 f:hf9-gdy 62 rrl6bvys?

  In Fig. below, what is the acceleration at oz z9gq- by5+z(r/ jcv3.0 s?

  In Fig. below, what is the average accelerz9-:spzopsmsd 37m. i+dof ;cf( hul4ation from 0 to 5.0 s?

  In Fig. below, what is thaaz j*aar4 3f:*pc e1ve average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0(/pps,n xipa qtl:z7 8 s?

Does a car speedometer measure speed, velocity? {speed|ve:y xdivhd/-2xf 41b(x. /g ok yamo4xblocity}

  An object can have a varying speed if its veloc19l b tt97bmezity is constant.

  The velocity of an object can be nc6h5 n(v: alf2t5qmz legative when its acceleration is positive.

  If one object has a greater speed than a second object, th96 )7 o8u1czinjoucale first must have a greater acceler nuc1l9c8ujo6ozi)7a ation.

  Two cars emerge side by side dtpmkjxn 2/o5 )sik-* ,njco: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 oz-j/e7nvm *xspeed as its acceleration decreases.

  A baseball player hits a foul ball straight up into n1 d 8x,*ve3mwz i9mvmthe air. It leaves the bat with a speed m 38 md,i*evx9wvz1nm 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 spe 0) nr.ajvee0 s6:vw: 5u4ye pjdy7npaeds up, what is happening to its acceleration, how does it change if air friv ne4a065wr7js:pd eavyj )p0 u:n.yection is ignored?

  As a freely falling object speeds up, whts0v l0xb2 -j gj/bvaz-ev0t lv9 nn*4at is happening to its acceleration, how does it change if air friction CAN NOT be i nvsb0l av/ n2j gzxtv4 --90letj*vb0gnored?

  An object that is throba n)b*emx f 0+ma)hb3wn vertically upward will return to its original position with the same speed as it had initially )xbnm 0+ mafh*3beab) if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velv : u1;h9 qabijfpnz18 k:4icwocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero accen3(v y7q h84sq40kx15 )k yt srkcoqqvleration at the same time.

  An elevator moving from the eb mdq;3 z5slc945l; e 8uejowsecond floor to the fifth floor making no stops along the way has zero acceleration 9 edl ouj4 ;8ecz5b ql3sew5m;all the time.

  A rolling ball moves froc;1*d sci rcm-m $x_1=3.0 \mathrm{~cm}$ to $x_2=-8.0 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. 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 $x_1=2.6 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile ki-zho-*j ek8:42hnpk vo e0a($1 \; mile = 1609 \; m$) track in a total time of 11.4 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 107 m away in 1ub e.dt.a; j*u2.1 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its average ;t *.bud.aeuj 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 x8xq a pb)u 3+;w,xjjy$13 \; m/s$ to $25 \; m/s$ in 4.1 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 5bw6/v95 fiin wymqv)$17 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacj0.wgsn1kjhx q8c r 8z)6u:h g-ydo7 ch a speed of $29 \; m/s$ 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 out of the blocks to essentially top speedf a+k4dk)c; h;cw8ew ,vz/ot7eqa e y* abouteaez q7tf a;v wcy,ke/*w o+4;8ckd)h $11.2 \; m/s$ in the first 14.3 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 univ2wwpg rh* )y:l4(onolr5 d:ymix7 p0formly from a speed of $16 \; m/s$ to rest in 4.30 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 9hs:7tiybkj. 92 m long on the highway. Assuming a decelbj9:sy. k i7theration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go-amp zqmj7v 7k ,, :reh2h+ bs3jabkl;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).    $m$

  A runner hopes to complete the 10,000-m ruj */sja. 7+wa pdpx 9sa7kbk7( hmncm/n in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate ats7 ajakcm9/ajnx s(/h .b7ppkm+ w7d* $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$