Suppose that an object travels from one point in1. rapd23ehba space to another. Make a comparisa1dp23 br.aeh on between the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantand7g3wn wha w2.eous velocity?

  A new car manufacturer advertises that their m(+ iiwtpw gpcdr)a-*1b 2y-ncar can go "from zero to sixty in 8 s". This is a description1g-dpicayrwm-t+ )w( pbn*i2 of

  An object moving in the +x axis experiences an a )jx;b 3+kcdt0+hase kcceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow dootcu*h be3 qe4e4qz hxc473;kwn as it approaches 3bzthqe4uek4 c;4x*7 qo ech3a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-ibm/u4 ,nahy5 cfaz/2x direction) begins to slow down as it approaches a traffic light. a a/,/nc 5ubi4fmzh2 yMake a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement 4.69fmrjht*u0rjf r m concerning its acceleration. tjmr0 9.jfh*fmu46 rr

  If the velocity of an object is zero, does it mean that the acceleration is zjcp*;k2nf)olc:(g. tt -a qqaan, 8r kero? Support ,):8cpqcl akk;*(gna nf- qta.2rjot your answer with an example.

  Can an object's velocity change d a;iu)gdy.g i:1b+ uzame-5t qirection when its acceleration is constant? Support your answer ui)ugg. myq-a5iz: a et1b+ ;dwith an example.

  Suppose that an object is moving with constant al.cmz9yiu0y+ wj);j v cceleration. Make a statement concerning its mc0 l9)i;v ujywm+j.zyotion with respect to time.

  Can an object have increasing speed while its accele)baax :vo)1weration is decreasing? Support ya:) ewb xa1)ovour answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill srv35 ( xezxo4y;e0bnof ice. Make a statem5o043 y(s;eezxbnv r xent concerning its acceleration.

  Under what condition is average velocity equal to the average of v110n9gqqacv82 rmig p4-hlythe object's initial any 8-hvqqcvmn 01i9p lrg2g a41d final velocity?

  Objects A and B both start at rest. They both accelerate at theew50b l,ajq v2 same rate. However, object A accelerates for twice the time as object B. What is the final speed 5 20wlvb aj,eqof object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate.(6y z7a9b qnag However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that ofa yqbgan6(z79 object B?

  When an object is released from rest and falls in the absence of friction, whichx8th6 pvek)8mpv k1r / of the following is true concernink8 xv8 pr mv/)6phtek1g its motion?

  When an object is released from rest and falls in the absence of friction,3sa*r k v1tyl *r9m)nw which of the following is true concerning its moti* vkm9)*ly s3wt1nrra on?

  Suppose a ball is thrown -1bxfdpm 7p. istraight up. Make a statement about the velocity and the acceleration when the ball reaches dmb1pi-.xf p7the highest point.

  Suppose a ball is thrown straight up. What is its acceleration ju3 uqwr7eo)e. gst before it reaches its hewq7e.ru3g ) oighest point?

  Suppose a ball is thrown straight up, reaches aji +2cs- zmbe7x/y vk*bdkw8x 6m je() maximum height, then falls to its in dk c+iwmm )e/ 6j*xzbe2(ybj- xsvk78itial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height o 9y3n;gmpxb.;jv uv7, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming dop 3mnyxo;v; 9v7jgu b.wn.

  Suppose a ball is thrown downward in the absence of0bbj any 1.v1 3tcmfw3 air resistance. Make a statement concernin0mn1 yvc1.jtba3w3 fbg its acceleration.

  Suppose a skydiver jumps from a hpr*sx:c lux0,p8b b7s2z yqs 1igh-flying plane. What is her acceleration when she she reaches terminal vel82qc sss*yu7rx,:b ppxb1z0 locity?

  A ball is thrown vertically upward with a speed v. An identical second b1hzz1 pk 0 vf k6hthobiqj;-6 +xgdt9;all 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-+ hv x 1d;j9zg;b6pz6qo t1hkifk0h t ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped fr4c owrjc j+kx2imq -.)om the top of a building. One second later, ball B is dropped from the same building. As time progresses, the dij.q km- ir4 )w+xc2jocstance between them

  Ball A is dropped from the top of a building. One second later, ball B is 7- 8r au tyj*69, be dm6lyy/mc0boqbpdropped from tljy7m8m6ru /q*,tbabdp-o6b0 c9e y yhe same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buwe wxqy78tgy;)0n .p milding. One is thrown up, and th; x tng.q7wempw)y08 ye other is thrown down, both with 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 brick is throx3j -kmm4b*ee d pjvlh pu(4)n4nk3k/qr3 q n8wn straight down from the same building. They are (nqnm3-u 8 nk3klrbjejv4pq /4 h3kpm*dx 4e )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. Thessb-bbbc8d1hcx55jdqryq( l; .7o l3 position versus time graph of this object sx5; hb s b 58yqj3l-7q(dol1 .bbrdccis

  An object is moving with constant non-zero accelerjwc 7gkkxy3q*: a,4zoation in the +x axis. The position verszocyk*kjga4 7q3, :wx us time graph of this object is

  An object is moving with constant non-zeeaa:n,i ; n (-zojkdn3ro velocity in the +x axis. The velocity versus time graph of this objecna3(anzk ,:-n;jeo di t is

  An object is moving with constant /i fkv91yr nnwn+ +7fqnon-zero acceleration in the +x axis. The velocity versusf7i9+1 wqrv+ kf/ynnn time graph of this object is

  The slope of a position versus time gp. r-au4y0pjjfaxz di8 4h;)o raph gives

  The slope of a velocity ver*jkkat mv; 17lsus time graph gives

  The area under a curve in an acceleration versus time graph w(xg k2od 6r*xoy;9w:pow:jn gives

  The area under a curve in a vely6k y5ttb7nb82 onrc)ox y4n-c9ng 6w ocity versus time graph gives

  If the position versus time graph of an object is a horizontal linvw /db21ya/ ote, the object bw/dy2av t/1o is

  If the position versus time graph of an object is a vertical line, the objey 6m pqrjw: -j5l/z/zsct is 5jz z/mwp- ljs6ry/q:

  If the velocity versus time graph of an object is ;.;o;wt a man)m(khne m(tr3ba horizontal line, the object i;.( ()mahrwetnm natm ob3 ;;ks

  If the velocity versus time graph of an object is a straight line making an anf m6 vb-l:*)cdlkx rz8s k+8m mdo23gvgle of 30 degr-* dld23sz r+om:6kvg bf88 xm)mklcvees with the time axis, the object is

  An object moves 15.0 m north and thens,,(dafrim k;tg3jb wdg.; t( 11.0 m south. Find both the distance traveled and the magnitude of the displacemen tj;; asfg(.wgbidkr ,3tm(d ,t vector.

  A boat can move at 30 km/h in still wa t*a -.; 0,lcbnmhzz 8rljq7fcter. How long will it take to move 12 km upstreamtlcf c0;j l*,nbra8zm 7qz.-h in a river flowing 6.0 km/h?

  55 mi/h is how many m/y:-;)ivtsh rhdxty n-s05- whs? (1 mi = 1609 m)

  What must be your average 6c.*8jd6y o;lwf ifotspeed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hg*-g; 3qqtvuaours and 57 min. What is the averaa qg*vu 3-;tqgge speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tflg34/kcfh ev1+hcnb98q x k+ ravel 400 km?

  A ly (light year) is the distanc+w b+0e:skobly+q * pze that light travels in one year. The speed of li s ykz:0pl*b+ wbe+o+qght is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road amob 07ttnue1*f w3dr(xiu 19gnd you look to the side for 4.0 s, how far do you travel during this inattentmfg (1 17x90uu3*bod nitwertive period?

  If you run a complete loop around an outdoor track (400 m)fdt4 a8yfbj; 5ah m,0z, in 100 s, your average velocity i;m 5t0by a,4 jda8zffhs

  A polar bear starts at the North Pfr6 qub ne gia3*.qvi )mc*m+,8mp-gqole. 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 aver6*mm3 nib, r m*qv8eq.)ca-pgugi+ f qage speed?

  A polar bear starts at the North Pole. It travels 16z *almq bc9m.0fmcsqt+7g)n.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 averagetnafbm 0qgs)cc.+6m9q ml 7 z* velocity?

  You are driving home onk.:es w n:u5az8i pqh/ 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 isn: w5ih/qku:az e.s8 p your hometown from school?

  A motorist travels 160 km at 89tkpzoao: 6m 00 km/h and 160 km at 100 km/h. What is the average speed of the motorist for tt: 0po z96akmohis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whatelgqhqs: 3bw01p8 1fz is her avera3gl8q1fsz 0p h :1bewqge speed for the trip?

  An airplane travels at 300 m,mnc6,/-f iiq* ezww fi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the6fm- / i,ze,qcnwif*w trip?

  In a 400-m relay race thesmq b8qbp,(o.ea-c 5 n.4nxun 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 team A runner starts the final leg of the race, in order that the team A runnn oxq(n qsmb u-ecp4.8,b .a5ner not lose the race?

  A car decelerates uniformly and4e2 ismtin58-yfgn.v/ udd2o comes to a stop after 12 s. The car's average velocity during deceleratit.5d22 -sngyofi u8/4e nimdvon was 58 km/h. What was the car's deceleration while slowing down?

  An airplane increases its af.2sb*pz v hv ox,m-;lqc5y5 speed from 100 m/s to 160 m/s, at the average rate of -5 . ,*h5xpby 2czsmaqlo;v vf$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate x ot: 9h;b+9iedsuhb+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 accelerv6nkkat)lrm) +b hq,zb tc. 74ates 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 mh6vi3rlvtoj*7 zgb 7.f8 tu z3/s for 10 s. It then speeds up with a constant accelerationlr3b6 ouz7*37v.g ijtzt 8fhv 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 6.2 m/s/ffr.fbg)e j2v jm7:f experiences a constant acceleration o. /)fjefrv2gfb7mfj: f $3.7 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) wil cy h7 7ej3ug,ocpk(3th a speed of 322 m/s strikes a sandbag and penetrates a distah7cy3g(u7 cepo,j3l knce of 61.40 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on 5u7o h dbuag+hkd4nak32.np )an aircraft carrier. It reaches a speed of 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 ch4a u2daupo3ghn. 5k)7bdnk+atapult?

  A car starting from rest mp4 f0s*dur wlne*yzuwa 8r*04 oves 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 8 l;2n+0 r,w rqst4sxlk0 m/s in a distance of 200 m. What is its average accele2 qn0ts;l+ ,lw4k xsrrration?

  An object starts from rest and undergoes uniform acceleration. Duj, oba/sktss-* 4dv n5 lr ;ff1 dq+grhtm5b;1ring the first second it travels 9.1 m. How far will it travel during the third seco nvs/ 5-jfgss;1b bo,+1lr5;hk dr d*tt4maqfnd?

  An object is moving in a straight line with constant accelew2 -df zlc y6k,5dtm5nration. Initially it is traveling ,ztw5md6k2c -fnd5 lyat 16 m/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 accele)*u - pnvwbu6frates 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 aby0k( u .5dpwbkout $5.0 \; m/s^2$ 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 ngeb55w uj/r l)+nko5i e -q4ythat has been waiting at the interkqrubwie/-l+55 ngy j)e4no5section 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 with a sge, hvr h:c8np/(chycj(, ; dhpeed of 12 m/s on the surface of planet X where the acc((vpe /nghhh, r:y8jcc;d c ,heleration 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 of planet X w)l j3y4lwb m/9dhln- pw(uxel( 1z- pyhere thew le 14p d(-m9yhbu/y-(lxl)p n3zlwj acceleration 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 jjik4v;z( 0rdi+z 38)se osqmof 15 m/s on the surface of planet X where the accelerati id+ 8zmk4;) r3ssj(qe 0iojzvon 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 sxypvpkpi+t. l(3 b wcv vv/29qn)r:vb ttr +/;urface of planet X where the ab+9pp2wt.i b(; q)v3v :vr/clrtnvt yxk p+/vcceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If you;rrh6kwa x3g, r friend holds a ruler between your fingers and releases it without warning, how far can yx;wha,3 grr6 kou expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity o;oh no4a 5*job85 c cw8lm w5 ybu14tkv*,kbnvf 19.6 m/s. What is its velocity after 3.0bjnk44vbklct n1u5 5 vb8w;o * y *,omohw5a8c0 s?

  A bullet shot straight up returns to its starting point in 16 s. What is the i7bg or opmp1 ,*/ayl-knitial spyb oporm-k7 /l1,pga*eed of the bullet?

  A ball is thrown straigtwe zzv+ y6d-1b;(v mc), fn7o-cafowht up with a speed of 36.0 m/s. How long does it take to re)- oza o-7f(d6zbew1,m yvnc wftc ;+vturn to its starting point?

  A ball is thrown downward from the top of a builk2)j7dy fd 0apding with an initial speed of 21 m/s. It strikes the ground after 5.4 s. How high is the bd)7a 0dpkjy2fuilding?

  A ball is thrown straigoa7 bnism0z7/)1me fcwine474;1pugu rqm-d ht up with a speed of 30 m/s. (only fill in numerical value in the bln4u77/msm imgr ;oep0n1 7iq1)4wf dbz ae-cuanks)
(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 40.7 ml.n/4(qkdb, xn 3htph/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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what isvd*v:xmc t ks ul-jga28pl;0/ the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 s?psu w k 5+ig(sa5z*-+bfb5ydi

  In Fig. below, what is the velocity a a/k hh,s7pgt xg04:udt t = 4.0 s?

  In Fig. below, what is the vi wf99igr, ys8 gkws2)elocity at t = 5.5 s?

  In Fig. below, what is t qhy01xzm6yrz 8:ffg 5qzac;,he average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.y (2-umdzb*hmxg6l7j6a ;xvq0 s?

  In Fig. below, what is the acceleration at 1.0 w 9so sw+i0rvkvr *o0+s?

  In Fig. below, what is the - uiqgg 909 .j bkkmdhf.9qo/macceleration at 3.0 s?

  In Fig. below, what is the average acceleration o/um vi1f1+ i-9wxbrafrom 0 to 5.0 s?

  In Fig. below, what is the average accelerati;: (7t5 rl4bah2o:o: ux :eoesew6vfhvalh+ con from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 xgmok/efqf/jdc 8nv5h,q i-,t3t 3 ,j s?

Does a car speedometer measure speed, velocitgg(sll2l+c f0 z+ ,vwvy? {speed|velocity}

  An object can have a varying speed il;+al;b2o,bu f*xse u f its velocity is constant.

  The velocity of an objel* apn9t 0+ff0o,ks nnct can be negative when its acceleration is positive.

  If one object has a greater speed than a secoww 49 igrgi6vzu/ 2f4vnd object, the first must have a greater acceleration2f6i 49gvzwg u/ ivw4r.

  Two cars emerge side by side from i 3fbdbh:01m-ohp ; lma 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 accelerair7k,t2+ii2lmfem .ution decreases.

  A baseball player hits a foul ball straight up into the ai951c9iy/ 4xqbo z syizr. It leaves the bat with a speed 15yo94/i 9s xzqbzicyof $120 \; km/h$. 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 hap q)iym9l nsa5v ek0 4+hu(jt6npening to its acceleration, how does it change +9)ivne06ahm(t4 njul k s yq5if air friction is ignored?

  As a freely falling object speeds up, whatpn x7mag*ra 28t*gva 4 is happening to its acceleration, how does it change 72a8tgr m*nagpa4 *xvif air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original po h21(/yxep qab ro)yy3 *3kz7r4vehmf sition with the same spk3ov )4pymr3efx/*2hhry y eq1az7 ( beed as it had initially 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 a lmh.e7eo 4i9 wlkk g/3y2c7iat the same time.

  An object can have nonzero velocity and zero acces;(n0d8e hpz9inx tr)leration at the same time.

  An elevator moving from the second floor tpk0c qu;ss6g+o the fifth floor making no stops along the way has zero;s 0+pq6s ugkc acceleration all the time.

  A rolling ball moves f7dgul36;rh1b9hck,d6 gwp2ki f 1dtl rom $x_1=1.8 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.7 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qia * j04n-/ut wso3l92xm 7vh:ofmvdw uarter-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 it:j)9vbs.c0ufx y xty-s trainer in a straight line, moving 102 m away in 9.8 s. It then turns abruptly and gallops halfway back in 4.8 s. Calc- sxtvy:c0.fy9jb) x uulate (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 fromg)h0m:q8 f 9lgsb6o dxg i)2gb $11 \; m/s$ to $22 \; m/s$ in 5.4 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 .on7fe2 gpy5+5yjnq0erfcx 8 $19 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speep b5zq/h1cgv(hcf27 vd of $30 \; m/s$ 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 speed abqdwf19dqu 7-m4r aq1 bb+ek(kout wku7 k qrb+fem94bd1q-1a (dq$10.0 \; m/s$ in the first 11.9 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 fro5y hvd3 tia3np)5:ct8 aos o1bm a speed of $19 \; m/s$ to rest in 5.54 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavei.g , 2i.shejdj gt7kr 0l,c8i k1jl8js skid marks 92 m long on the highway. Assuming a deke1jlgj irgc.,i,j.l 8id 8k 7s2htj0celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr fbp -c/-zg oap.*i-)x fzr)rguck going $25 \; m/s$ 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).    $m$