Suppose that an object travels from one poid/k 5j)x5;irbwhntd :-n*lzqnt in space to another. Make a comparison between the displacement and the distancl)d5ndjw q :bk-inxt;h*r /5ze traveled.

  When is the average velocity of an object equal to h* ;x5gj*wgd7 s2f(f g,h5n ch1xtsyathe instantaneous velocity?

  A new car manufacture0; d /f;x6fyn8-qtx ) bdjsifer advertises that their car can go "from zero to sixty in 8 s". This is a description of)df 068fyf ed-j it/q;x ;bsxn

  An object moving in the +x axis experiences awy1zy4ld) ib ve/ x.m6n acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Easty9 7q ;;3voceep3 8ryu :gt8q4rwdyqy (+x direction) begins to slow down as it approaches a traffic light. Make a statement ;y 9qc;twreyo7yu y v:3qe d88g3qpr4concerning its acceleration.

  Suppose that a car traveling to kq/ie cnj 6g3j54kddqrhy0+ ss0:z 6ithe West (-x direction) begins to slow down as it approaches a traffic light. Make a 6:sndyqgjkhrz+05ek4/3 0j di6qis cstatement concerning its acceleration.

  Suppose that an object is moswvyrh5:w mlj1 /v :ajvkw:1- ving with a constant velocity. Make a statement concerning:wh:1vasmw 5 vyjj1l/r : w-vk its acceleration.

  If the velocity of an object is zero, does it mean thav)k3zc6: lufov+y5 d0osq 3 :ves /vxql s-r:st the acceleration is zero? Support your answ:f/y 5 z 3lc e s0:lr+odvo)u:-kvxvqs vsq6s3er with an example.

  Can an object's velocity change direction when itsy0f,g i s1-t5fla7s qz qag:.p acceleration is constant? Support your answer with an exampl,pfqa1:sgy l5f 0s .gt-i7azqe.

  Suppose that an object is moving with constant+7zl*oc qih-d acceleration. Make a statement concerning icq*ldoi z-+7h ts motion with respect to time.

  Can an object have increasing speed k+f (,*gjmcr iv5z kr;8nr(qzwhile its acceleration is decreasing? Support your answer wit c5j+gmk ;v,kr(8 fqzr*(ri nzh an example.

  Suppose a can, after an i xv7 4);aat(zfa6t84b* pz bt mqi:befnitial kick, moves up along a smooth hill of ice. Make a statement concerning its acceleration.za;b 4*a: (bx ibfz76 8t)ptmte afq4v

  Under what condition is average vel6wdl0jvmq-)e4s/ bj sdx d q-1ocity equal to the average of the object's initial and final veloc)l4 q6 jd0q d-jswbs ve1/x-mdity?

  Objects A and B both start at rest. They both accelerate at the same rate. l: n g d+lyy-telat:)qyb;(l-However, object A accelerates yn -qlya::telyl)gl(+; bt-d for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both stao j6f zx0*bf,o/ spdl 3lpji81rt from rest. They both accelerate at the same rate. However, object A accelerates for twice0*,/xofs zl pj jilobd 8f613p the 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 6 t8iq;*pm 91,ikkmzx/z oqzyand falls in the absence of friction, which of the 9i8,;zmk z6t/q *yqkzp m1ixo following is true concerning its motion?

  When an object is released from rest and falls in thk +qsb/o8te m2e absence of friction, which of+o8b qm/2 tsek the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about th.8xdrv v;y2 vd,(l7r(dx plkqe velocity and the acceleration when the ball reaches the highest point. vvdr7.8;vq2 k(( l,yddplxx r

  Suppose a ball is th(f6 +c:w e*e hnhtc11x9 tbeamrown straight up. What is its acceleration just before it reaches its highest hmwxfc+a c:bn e9*et1(ht1e 6 point?

  Suppose a ball is thrown straight up, reaches a maximum heigwb3 fy(xe-mp j/ 63sbtht, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is gobsp- t bejx (y63w/3fming up.

  A ball is thrown straight up, reaches a maximum height, then faliafjq*(3+krwmbb4 o 0ls to its initial height. Make a statement abo4fb0bw+qi3jmao * k(rut the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence oz b6rt.3wyf5-fexr gf+o pi+46jh9xkf air resistance. Make a statement concerni69ikh of.+3wgxtz 46bf-pferxjy+r5ng its acceleration.

  Suppose a skydiver jumps from a high-flying plang59- 0ygmteope. What is her acceleration when she shee0y9 gt-gpmo5 reaches terminal velocity?

  A ball is thrown vertically upward with aar5c (3d v/ wnv.jgec- 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 ball to thgn wv-cvd( . 5aer/cj3at 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 building. One a .vm3,rse*1i20qnpsc jvua 0second later, ball B is dropped from the samn3s qrse,01v maip2 v0j*.auce building. As time progresses, the distance between them

  Ball A is dropped from the top of a bbq87iysc otwhg35 6v -tq)/bp3+m /sqyy:m axuilding. One second later, ball B is dropped from the same building. As time progresses, the difference in their spqsg3+ti byma 3-vyoc8)pq6 b/ 5:7xhtqy w/sm eeds

  Two objects are thrown from the top of a tall building. One is thrown up, and tyef hm 5qx6:q7he other is thrown down, both with the same initia6h fqmxy:5 qe7l speed. What are their speeds when they hit the street?

  A brick is dropped from 9fp bb kfdkq 5e)ts5v6yf,+5qthe top of a building. A second brick is thrown straight dotydpvb q5 b +6fkesk q9f55f,)wn 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.6dst w8 6-z -ic.z, sodxe9idv The position versus time gra8-w,t9 v6oes-xi.dcz iz 6sddph of this object is

  An object is moving with constant non-zero acceleration in the +x axv l)p9*w5ichuis. The position versus time graph of this obju *i95v)w clphect is

  An object is moving with constant non-zero velocity in the +x axis. The velocil;bax0/okd8q+v yeh t ,u4 a1aty versus time graph of this object i u0/k;vy18t4,qaa ox l hd+beas

  An object is moving with constant non-zero acceleration h6s(hw*v1c jnas+ 3yxzx rq::xzu1)rxx9a-nin the +x axis. The velocity vers-z xyx3n19x h * u1qh6x ()a::vrj+snacxwzrsus time graph of this object is

  The slope of a position versus time gr051 ni;yyj4 orp6w ihiaph gives

  The slope of a velocity versus an0pr*4 (9qiq tk (w68fwvvzztime graph gives

  The area under a curve in an acceleration versuwpapo+gk 1 w*7s time graph gives

  The area under a curve in 8) abxeqp5 bc::2yelj a velocity versus time graph gives

  If the position versus time graph ;memfzo/k0j , of an object is a horizontal line, the object mm/, fo;ekz0 jis

  If the position versus time graph of an obl)qm 2;q;-yvh ylr ,dxject is a vertical line, the object is2my,;qr llh; dxq) v-y

  If the velocity versus time graph of an8 mke r/f-(dq j:afry3 object is a horizontal line, the object is 8(3fdkqmrf /:-yea jr

  If the velocity versus time graph of an object is pxune:w z* fcm98*eg vf6qb aik 559oi2)t fc3a straight line making an angle of 30 degrees with thev65i3k *f2*cm85quxf cetne)a9of z wg bp9i: time axis, the object is

  An object moves 15.0 m north and t.-v3cth: xrjh hen 11.0 m south. Find both the distance traveled and the magnitude of the displhc.xvh 3t:rj -acement vector.

  A boat can move at 30 km/h iyjwn(c sa*j6t. fot8/,o y3snn still water. How long will it take to move 12 km upstream in/jj 6w. c,( 3n*tao foytyn8ss a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = )a9q/ vvgaqea)fs+ * a1609 m)

  What must be your average speed in order to travel 350 km inmndf4fja0tu2 in8t *6v;g * /a4ktcxw 5.15 h?

  A runner ran the marathon (approximately 42.0 km)f)9vk .w jwnsr-ebrhy7i,bom 3hr .2. in 2 hours and 57 min. What is the average speed of the runner in mh7 je -wnryr sbf.,.wibm2ovk.3hr)9/s?

  A car travels 90 km/h. How m:fbi8v-w aj 7long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. T/ij x5mxvk50bhe speed of light is5bx k 5xvi/m0j $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you look to the side for 4.+ aqw:7 :2(sgwqx6t9he*g-on pstfry0 s, how far doq 92:yg+spw- a:xgnr (oq*7efswtt h6 you travel during this inattentive period?

  If you run a complete loop around an outdocppr3g: o-zxg;dr/ m7or track (400 m), in 100 s, your average velocity isg o3:zrpxp/d;7-r mg c

  A polar bear starts at the North Pole. It travels 1.0 km south, thenzs6 y 0re *bdbtbb+ t:t5:sav; 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takabd b5btt0+:e v ys:sbr6z;*tes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It gmc48eudd i(z ,ki p)+/ pm)mttravels 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 mipicet,d+gm)u m 8)zmkpi4( d /n. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It t9;c bo slh,xy7hen starts to snow and you slow to 35 mi/x;c,79ho bly sh. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km i0ld )us2pkp0xr / 4xbat 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for thd24xuxs)p kri l0pb0/is trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at mco- 7u zi:,m jh8rb) lq9q-lm100 km/h. What is her average speed for th m9 -molqzmq)i7r8c:,jlu- b he trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/km 330esu 4v4 vorwmpbdi7ea b.m)r74h north for 750 miles. What is thv3 beo44u7p4i) 3vsamk. d 0w7bmremre average speed for the trip?

  In a 400-m relay race the anchorman (the person who u k5sw-3ylcf; 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 stakclfy5ws u; 3-rts 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 xq tlzi1 l-1-w1 rxrv8stop after 9 s. The car's average velocity during deceleration was 67 km/h. What was the car's de lv 1-irxqt -zrxwl811celeration while slowing down?

  An airplane increases its spe j8 hcaw3*12 d6 kddvd8zb8hx8bwb8da ed from 100 m/s to 160 m/s, at the average rate of db38x w8jbawdch8k1zd2*h68 8 a db dv$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atedkql t1 yg8;, 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 accelerates-l:zzm u pkxd) il+4d. 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 constank)hu j+v)/or: tyiqm:t acceleratio v)ojthr+k:imyq) :/u n 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 bixex v8-7seh9 j-- k0gxxco,of 5.7 m/s experiences a constant acceleration o 7k ge hsjbx--x ,9e0-vcx8xoif $2.3 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) w+qsr(bi: t ,z j (fc n(rjka3xmij119oith a speed of 311 m/s strikes a sandbag and penetrates a distance of 96.41 cm. What is the avok:9((jq3 ciztsfi b+jram,rnx11 j (erage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carri kepa bm3)68-+ka gukf8;u my8rqvac 4er. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming t 8amu rcm+;ykak 3b4pu)ea8 vq-kg86fhe acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accel 1t9tl4*59 ci xu01petg cpbaneration 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 2 hv+kr368m3j fmjkt4n 00 m. What is its average accelerati43m6f8khjm v3 +knjrt on?

  An object starts from rest and undergoes uniform acceleration. Durin7w9 bpjuamgn7s5a,d:g the first second it travels 8.0 m. How far will it travang9j:sa7, wb7p d5u mel during the third second?

  An object is moving in a straight line with constant acclrn b y,21ldyb(;a3c meleration. Initially it is traveling at 16 m/s. Three seconds later ir lld3b;c21y ( bm,yant is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest anbr+g 1w3aankn) iv-z)pu ;yp.d accelerates 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//ue ;xp86l2k sf jazp 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 waitingl2bpa0httr 9l;4 sx rln69zzzt+bh2: at the intersection starts ahead with a constant zanrl90;tbbz l24rs t6 2t+ h9hpl:z xacceleration 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 sutrudmz k/0:f-g +pda v6rwl np-tm9) :rface of planet X where the )9- z : mpmt:w/vn tgd+-kuf6plarr 0dacceleration 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 surf qo4 zcygrl+gy) 136eeace of planet X wher 3)g+ eyzyc eor16g4qle the 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 of 15 m/s on the surfa9oj/u ) c+cugfce of planet X where thf/g9 ocjc+ uu)e acceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the surface of planet X eq / ;lmwysx75where the acceleration due to gravityl 5;s7/qwme yx is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater nt 1zwuhc09,j7r. c ym6t9qddthan 0.10 s. If your friend holds a ruler between your fing1tyjm9 ,7d q9zcw dcu06r.hnters and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19. +zxzj.5cz zq77qs ;yl6 m/s. What is its velocity after 3.05 ;zzcql+7z.7xzsyqj0 s?

  A bullet shot straight up r5xuj -l .r6suudf4 sune1- n2feturns to its starting point in 15 s. What is the initial speed of the bulle-f6ednn uxs 2js4r5fu-u1ul. t?

  A ball is thrown straight up with a speed of 36.0 m/s. How 8s*v0d.,cev ol.mu v9c vqds l4w 1i/slong does it take to return l w4q.mv ssc9/0osludvc d ei,vv18* .to its starting point?

  A ball is thrown dow i2tw0socy;nt 8x8/bl nward from the top of a building with an initial speed of 5 m/s. It strikebci;yto20tl 8 x /8nwss the ground after 1.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fillvuu a, q*xu4b,b5 x5zg2ry3zn in numerical value in the blanks)n2g4xvuu*5,zy x b ub3 azr,q5
(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 wie:kswh)x,8 8 w3;aym l/,clcy n3 d8cr kydch8th a speed of 39.1 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is qj db, k4x +7oecck)/ethe velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t ;dvz z +zh0zf7= 2.5 s?

  In Fig. below, what is the velocity atq 19 rna lyoi2p8ab0d8 t = 4.0 s?

  In Fig. below, what is the velocity at t0zc 0ebtdb z4/ = 5.5 s?

  In Fig. below, what is the averaghfoi s73cr5 : *1(ju xrvhxt:h 7iyr4xpy yn.7e velocity from 0 to 4.0 s?

  In Fig. below, what is the average dxxbt;c 2o)ar.m9worma19wzu:*h f0 velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration un - w1bg60crdat 1.0 s?

  In Fig. below, what is the acceleratio1ac) inccq8)c ,(xpi dn at 3.0 s?

  In Fig. below, what 0e3)ga)l) iac jgokx6 is the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acce+a * y67vnmw/xus :n nsguw6p0leration from 0 to 8.0 s?

  In Fig. below, what is the displacemenp,1 u(t k6toer3zy ay*t from 0 to 8.0 s?

Does a car speedometeotbe)7sq5l(m ty36rm r measure speed, velocity? {speed|velocity}

  An object can have a varyinie.am5 ts; .ahg speed if its velocity is constant.

  The velocity of an object y 7rd(am x2;xryz,mc +can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the.mow9c k 8;lpbzi2-i 69 eersh first must have a gr;ebzlrm. wpshc 2-ie9ki 968oeater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed o.x.c-ercc3k2 fdn(mrcz/ trwh 1c j5+tf cu)2f $60 \; km/h$ 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 accel9sn7 7ee w:nivswlc6vj(;se x2 l:+paeration decreases.

  A baseball player hitin k2jb6j 36hns a foul ball straight up into the air. It leaves the bat with a speedji3n6khj62 bn 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 ha0 ck68sgx rydj3z5 bt8ppening to its acceleration, how does it change gz56sjrbdk8308 t cxyif air friction is ignored?

  As a freely falling obuq/nojgh z -;x4n2a .uject speeds up, what is happening to its acceleration, how does it change if air 4q;ox. gu/- j znauhn2friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origin9jx5 nu-t;e iz 9ws.qtiwd(0wal position e w(iwt5uiqjd99 s;xnw-z0.twith the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zeruqty6t v4g:(ctbi6u. o velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleratio; 0pmp(- pdqim9 kdi2an at the same time.

  An elevator moving from the second floor to the fifth floor making no spc7tod.y (pfrs 3-6 vytops along the way has zero acceleratioyrfsocdy6p( pt7 3-.v n all the time.

  A rolling ball moves frova3f) x-lbk1fm $x_1=3.0 \mathrm{~cm}$ to $x_2=-7.1 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comx 5t:s qmii dw*;oz4p9plete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away m- t5v5 w d)k-i+omovgfrom its trainer in a straight line, moving 113 m away in 10.3 s. It then td)o5+vmowmi-t k v-g 5urns abruptly and gallops halfway back 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 frzzq 0pg2suq7 m1)7h ug jl(tv+om $11 \; m/s$ to $23 \; m/s$ in 5.1 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 fro -ro 5,v4; hukig7zemim $21 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach aujdn p/ 5g5n :fk2ia8z speed of $33 \; m/s$ 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 burst out of the blocks to essentially top speed aboujva4 bse,ryods6/va *2jm8 )l by8a,4j/vlj m)2s*ve6r aos dt $10.1 \; m/s$ in the first 10.2 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 ae f-87ttse ;ma speed of $17 \; m/s$ to rest in 4.90 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 -nony1x good3 b5e:9d on the highway. Assuming a deceleratioo od3:y- xedo9b5gn n1n of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck 2vub6 flwd* :b9fymm87 dxjrm1i5 s5bgoing $25 \; m/s$ 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 th -kl bh18ci3spe 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runnebp8 1h-iskl3c r must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$