Suppose that an object travels from osqw -s+9ygx 8d7 ijuxw tq8a54ne point in space to another. Make a compar 4gd8s 57iuj yq8s 9wxatqxw+-ison between the displacement and the distance traveled.

  When is the average velocity of an ob+ l 5h9tb9- en2xgknugject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "i hv*k*jk-y )1bu9n y.dhww j61uy ,ywfrom zero to sixty in 8 s". This is a dh 6yywuh1jiv,yj.yubw)**w1 dk 9kn- escription of

  An object moving in the +x axis experiensnx d(( yei.3xces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begingtys2a4t4 zh)y r7f3us to slow down as it approaches a ha sy3g72 )fy 4u4rtzttraffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x d4msv e.5st*lspirh *s 5*fj *direction) begins to slow down as it approaches a traffic light. Make a s5 * d*5 mte **r4pvjhsissls.ftatement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a stb d.6hh6dtn .;bydyd mds );8iatement concerning i.m.b6ds ydh6h;b ;n) d8d itdyts acceleration.

  If the velocity of an object is zero, does it mean that the acceleration i t6m,9caqz wlf;2d /wos zero? Support your co6 mzw wq2t,;lfad/9answer with an example.

  Can an object's velocithnuidxj :2fz3ob/(nqeiz 8 8)y change direction when its acceleration is constant? Support your answer witu2)on bh d 3 (qinfjzez8i/8:xh an example.

  Suppose that an object is moving with constant act .an/o q75zewceleration. Make a statement co7a .wo5teq nz/ncerning its motion with respect to time.

  Can an object have increasing speed while trhl 9a 81g8kc; sfjnyvqa6,) its acceleration is decreasing? Support your answer wn6 csfat89y,grhk)va 18l j;qith an example.

  Suppose a can, after an initial kickrkzg m8 pv* wg7v+i6y1, moves up along a smooth hill of ice. Make a izg8*grw6+kp7v v my1statement concerning its acceleration.

  Under what condition is average velocity equal to the average : mz 2 gn)ene1v4ua 8lp5afj8(jvaz1g of the object's initial and final vez1lan jumajz4(v1p2a8ee5) fn 8 g: gvlocity?

  Objects A and B both star7x e;mh: c vq 3xo4v:gdou-mf0t at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. ox;4 d 7ghm:c :3v0 xu-qveomf 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 +hb uno3-1bjwxc++4 d1-7em qirxjlt same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared uh1+ditb7j wxqc+ 3j 4br1mx+e-no-lto that of object B?

  When an object is released from rest and falls in the absenl. rj j:xd..aice of friction, which of the following is true concerning its motioxj raij.: l.d.n?

  When an object is released from rest anv/yleux7jj:8eww( : ed falls in the absence of friction, which of the following is true concex8:leyveeu: 7w j/j(wrning its motion?

  Suppose a ball is thrown straight up. M,e7fm5plo+dcm b-eni6xo/ 1 92at kc xake a statement about the velocity and the acceolx 9n 7 /x2m tfdka-c61o+,emcb5p ieleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just befoilf ejo 0 :ixt,*uw6a2re it rl6ojetu i:,f2 0ax*iweaches its highest point?

  Suppose a ball is thrown straight up, rea-pineppv ft.,j ,ut89ches 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 pnu v 9 fji-t8.p,ep,tup.

  A ball is thrown stram1ni k5ljxfqv)/rblxb /3 ;l5ight up, reaches a maximum height, then falls to its initial heightl1x rnk /5ifmj3/v lbbl5); qx. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward ijqk8cb) 6z x0 2u:llipn the absence of air resistance. Make a statemex uz6 b)q0i:lljk28cpnt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wha8t43ho,viuzm y /gj)nai9gj* qvgv. 7t is her acceleration when she s * ,go9gz4i)ganv q7vjhui 8tyvm3.j/he reaches terminal velocity?

  A ball is thrown vertically upward wio su- l,uwr :/ff6hdw0d+0bx nth a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second -0swr/6wfnux 0lf :+bh,dou d 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 buiq) (l(tt ma cyk6-g o9z8.nuvflding. One second later, ball B is dropped from the same building. As time progresses, the distance between th u 86zavq(m9(tocf g-t.ky)lnem

  Ball A is dropped from the kak-t nd8 4n at,yju(x,dr+(atop of a building. One second later, ball B is dropped from the same building. As time progrekj a(8d ayt+4xnk,rt, ad(n-u sses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is k+6emac 8 )w mlr-ks4lthrown up, and the other is thrown down, both with the same initial spm6ca4l -kmklwe s)r+ 8eed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A sevwrl9 npmh2)56) mzl xcond brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare z w6np)vm )l9xhr52mlthe accelerations of the two bricks.

  An object is moving with ) f1l08 7fq jrqj5it7zbg(c fyconstant non-zero velocity in the +x axis. The position versuc f8 qqfl1 r7izyb0)jtj7(fg5 s time graph of this object is

  An object is moving with constant non-zero acceleration in,0( *w.euhv5x+rof nrnwfmb . the +x axis. The position versus time graph ofn +h, wx0frv 5u..b*eo( mwrnf this object is

  An object is moving with constant non-zero velocii0jd ka)th64k9kdyj/pae u07ty in the +x axis. The velocity versus time graph of tu6 ai/p 0d)ka 74kteh0jd 9kyjhis object is

  An object is moving with constant non-zero acceleration in (wya08pttfe ,e li: 5rthe +x axis. The velocity versus tiae(wf5:e 8i,t0 tlpryme graph of this object is

  The slope of a position versus time graph vqskuq5 kol - v,b6(cdc:pk2(gives

  The slope of a velocity vers8 8b3xns-,evg auii. wus time graph gives

  The area under a curve in anw79f- 8eu b70iwm-*ebbz5v)xql t -xto5ppmv acceleration versus time graph gives

  The area under a curve in a velocity versus timeirw* 1 r skei d;ypu/y5qri3,+ graph gives

  If the position versv,6gbswn+ qu9c1f d3dt+ )y(n f2 fpxaus time graph of an object is a horizontal line, the object ic6,axffvnwgn1b9 2q pt)3 s+(+d udy fs

  If the position versn n-5ynk78ehj p(t0pjus time graph of an object is a vertical line, the object ispphy-je 78nkn 5t0 jn(

  If the velocity versus time graph of an object is a horizonzld7a5y23cy; a/ f0j6ddyvo, am(weltal line, the object i/j ay0a 6(mec3w v5a fzdloy;7,dydl 2s

  If the velocity versus time graph of an object is a straight l:cqt.eviy55rl tu6 m- ine making an angle of 30 degrees with thu e6t q-5lvict5yr: m.e time axis, the object is

  An object moves 15.0 m north and then 11.0 m sih g6qnb2 o/our9y+e/outh. Find both the distance traveled e/ n g+26 /qh9yrbuoioand the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long 0b ) bej hx4xfv9e*a9jwill it take to move 12 km upstream ixb*x9ve j4j ae)09fbhn a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = e6 g4n+qeob8 ky5w7fkkw0u.t0) dauc ossp* 1 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 h?e-v9gd 2 zauj4pm6 77zngyk w;

  A runner ran the marathon (approx: ,hc5zd/q(1ud+c;wjblanun imately 42.0 km) in 2 hours and 57 min. What is twjl n/uacun+cd5dqb ( ;z 1:h,he average speed of the runner in m/s?

  A car travels 90 km/h. How long does ivyhy8 dgo5 :7 w:qplk-4uu or1t take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one3 d fjkwn fk601hw sae*)/x7ps year. The speed of liwk)* axs3 f1pk076fsdj/ewnh ght 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 afm*.o n2 p;h3qr*,bp sbea3lilong a straight road and you look to the side for 4.0 s, how far do you travel during tb** nmo,flp3ea qsibhr . 3p;2his inattentive period?

  If you run a complete loop around an outdoor track (400 m)ql *. hnl)1 ypkp/3qmk, in 100 s, your averan)1* mlk.hqk3qp lpy/ge velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1z-m2;zg,f hqghchq ,de7 bmnx; *bw15.0 km east, then 1.0 km north, then 1.0 q2 *h fzghwz b,7m ;;1n,dmb-ech5gxq km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. a*u k((rth fl+3 7hhydIt 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 r7u*y+hah3d(lh( fkt average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It thmr(lgal 2b13th:i+ i hen starts to snow and you slow to 35 mi/h. You arrive b i+i(321llhm gtrh:ahome 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 ne+ x2-6a ufz7evju4 uat 100 km/h. What is the average speed of the motorist for this t2-zaue jnu +f 7ve6xu4rip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km-ww6seil 6b,ta1dxd (gsj8e*/h. What is her average speed for the triw 6ed l xasbe(6istj*wd,-g18p?

  An airplane travels at 300 mi/t p if.rbjg: s 6w/c6esjt-c m0i+.8jph south for 2.00 h and then at 250 mi/h north for 750 miles. What +j bt i cwj0r/mjs6:.sp ic6pt8g.-feis the average speed for the trip?

  In a 400-m relay race the anchorman (the person who4ll2l7j; cd xh 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 large ;j7 24llclxdhst 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 t xrc; yk3zr sza+ ))u7a-qy4xafter 9 s. The car's average velocity during deceleration was 78 km/h. What wa sxczakra+)y)x4yur7tq 3 ; -zs the car's deceleration while slowing down?

  An airplane increases its sy5 py2n)+ razkpeed from 100 m/s to 160 m/s, at the average rate of yry 2z 5n+k)ap$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of arp14wn8+rf2 cr;ml w$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and acceleh , f5fgu c4*-ola9lf6rumf;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 constant accelerf*p:u((t6f8fcw l2,ups5pvx kdhw1 k ation of l6k8xsv c,wudufpp kh :wf52( 1f(*tp$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial v qp -*(n6wirsic u2lq4elocity of 5.1 m/s experiences a constant acceleration of nuq p-q l*6rw4ci2s( i$4.5 \; m/s^2$. What is the cart's displacement during the first 4.6 s of its motion?

  A bullet moving horizontally to5iav5jch:wvm7uq*qsqk 2 (f5 the right (+x direction) with a speed of 303 m/s strikes a sandbag and penetrates a vk75(shj mfaqw* 5 icq5:quv 2distance of 37.29 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on aukh)x 9w 65jz8yfht m;4opxe/ n aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, andftw6ejuz x; m/)9pko8 hxh45y 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 accelera4vbfp ,jj;wy0my i*,k1el z ,xaze6, etion 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 dis gzm;2tx6qure2 97bd ptance of 200 m. What is its average accelerap9db262mtqr z7gxu; etion?

  An object starts from rest and undergoes uniform acceleration. During t ege4)bu3s6m dhe first s m4u3 )edge6sbecond it travels 9.9 m. How far will it travel during the third second?

  An object is moving in a stra9ewn+ pvn nar6 -nofgeca tl4)42iu/+ight line with constant acceleration. Initially it is traveling at 16 m/s. 6n-p l2+vr4i4c/nta)wee gu9a nofn + 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 uniformly at unm(lxw * 6(qn$3.0 \; m/s^2$. 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;eb3g 8r eqkeq -(/wf/e xspa4 on 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 turns green, a car that has been waiting at t;j-mp(xi7)hjrj)bz o he intersection starts ahead with a ;jo p7 zjr)h-b xj)(miconstant 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 w 7./n,3ujzhrb+z fwp4icy5 cof 12 m/s on the surface of planet X where the acceleration du/. wibhcfn,4+ w 5jzzr7p3 yuce to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a spee5bmx eo m1dxrwu +uy3;y33 l*md of 12 m/s on the surface of planet X where the acceleration due to gravity is yw*r5xe ob33; d1mmu +l3uxy m$1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/mmy diou,gq2/wh *e p v,h5:9b+rtbz *s on the surface of planet X where the ae*h,2 +md byhptuzw/ rib m95 *:,vqogcceleration 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 1ytyha,w9.s0ni( 2c i61 wmafi 4 m/s on the surface of planet X where the acceleration due to gi n0 ,ahcm1s6(wyf2i ity. 9awravity 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 3 d inj3(kldvszu ry8.nfyh34txq3 +;s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expeq+j83lf33xytd(ds r3viu k.yz;hnn4 ct the ruler to fall before you catch it?

  A ball is thrown upwa(4n jnx7iz*r y li9mo5rd at a velocity of 19.6 m/s. What is its velocity after 3.00 s?mx(r 54liozyn7 ij 9*n

  A bullet shot straight up returns to its starting point in 16 s. Wwy z8 s43gbydxy (gg93hat is the initial speed of the bulletyg 33(8 94bxgdzysw yg?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take ttus6+;0 nqgpjuoqq9 / o return to its sj 0t 6/qusnqg;pu+9o qtarting point?

  A ball is thrown downward from the top of a building with an ,l+xal+z oudwr01n0s initial speed of 17 m/s. It strikes the ground after 2.3 s. How high u 0lz dl+n1xwras0o+,is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in num kjy.p w+v84ar gnctman3* t85erical value in the blanks)*8ga 5k3.rwatmytj v+npn c84
(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 withlygz) lk ij 4.7;xyn;c a speed of 49.0 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 .iw-axlrqeg/zqe sfwn43 6+,the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = abze52(f0tq8bkrc: n2.5 s?

  In Fig. below, what is tw2b xhg8+ ,qythe velocity at t = 4.0 s?

  In Fig. below, what is the velocity azoqci9d :kn7c 1-a9d ,qs:fv+q xx5r ot t = 5.5 s?

  In Fig. below, what is the average velocity from 0 d 8vq if.4*zsdj1l2xnto 4.0 s?

  In Fig. below, what is the averz2 dt0q.tta41gis2awfi(3rbe;pwgx7l5c ( x age velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at q o,v -tcb:fb(63yrjyop 6n 1g1.0 s?

  In Fig. below, what is the acceleration at 3.0 s?ms le1dxn)2j.7 * qzy+8fv kat

  In Fig. below, what is the average acceleration from 0 to 5.0 r(p7 rx)g/gwo s?

  In Fig. below, what is thnjfv3gg g)u.bevsb8a5r50 0p e average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displa ,qol2 2i5xv x4t/iuxqcement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {sphd)r,;ai )nm eeed|velocity}

  An object can have a varying speed if its velocity is constantvhhreb*l0s 7+ .

  The velocity of an object can be negative when i 7i5 gt:q4ajjjts acceleration is positive.

  If one object has a greater speed than a second object, the first must have ff*2 h4qhxoalc )ji1* a greater acceleratiocl2 j*f14f)hai*x qhon.

  Two cars emerge side by sidskw(.jj 9v1/ub o st02crx.h ke 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 lb ysij,52i2y )pb r.ng4nvp+ decreases.

  A baseball player hits a foul ball straight r 12f ln6v6tfoup into the air. It leaves the bat wi16 tf2lronv 6fth a speed 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 happeg6yj 3i4qiffm8 i0.gjning to its acceleration, how does it changeyim3 4gigj6j8 i0.f qf if air friction is ignored?

  As a freely falling object speeds up, what is hd,c4g xfx :( (wxafs4happening to its acceleration, how does it change iafx4(x(gcwx,dhs :f 4f air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positr/5cvk;nc4m-o vqf7, i*m0vs lsb 0abion with the same speed as it had initially if o,/l4i;fvmsck0*srqb-v5m av70nb c air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero veloci .nnjcgt*fv1+u*z r az*9apj1ty and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero accelkhy ry,pfs,x*4dy3*s3 5figy eration at the same time.

  An elevator moving from the second floor to the fifth floor mad bdoclrx: +m:l;h0c+ king no stops along :c+mdo x:cb hr 0d+;llthe way has zero acceleration all the time.

  A rolling ball moves from gzs *k)d9auv+0y/k t-+toe ,uyc +nzh $x_1=3.0 \mathrm{~cm}$ to $x_2=-7.3 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile+ezc)ef n,kx4yd1 dn3 ($1 \; mile = 1609 \; m$) track in a total time of 7.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its . u 0f.vfvpcxcs4lw15trainer in a straight line, moving 90 m away in 9.6 s. It then turns abruptly and gallops halfway bacf.c54plu1 vf0cs wx. vk 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 fro.v,kv .q1ib0 dp8ma gpm $11 \; m/s$ to $23 \; m/s$ in 4.0 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(11f voqjd 6ro36+hzbgnlw t 9 $15 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must r(+j kmb,ns)cpss v6: cp /g;ndz*we+g each a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can *2xtd.a q9 vbbo6r er kk4;(th+a esj8burst out of the blocks to essentially top speed about o(ek. 46xk9 jbq2ta bv*r8s+h ;rdeat$11.3 \; m/s$ in the first 10.4 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 b0xy)d 8f2rg5xbs 2ks speed of $18 \; m/s$ to rest in 5.52 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves sk- u ezy8m+o.v;i yw0rrid marks 92 m long on the highway. Assuming a deceleration+myuo.v e;rzyr8 -w0i of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going xs bb1,kh .t4z$25 \; m/s$ 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 cogjsyyzn8 27kjt :ts g:51bjb+ mplete the 10,000-m run in less than 30.0 min. After exactly +byj k8nj ygsb7ztg2 1s j5t::27.0 min, there are still 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?    $s$