Suppose that an object travels from one point in space to ady tye -f:7 j*v(8c.eij ytrf,nother. Make a comparison between the displacement and the distance trave( ej ijvdr8c -yfy,y.e7t ft*:led.

  When is the average velocity of an object equal to the instantaneous veloci.pay60 ( jbve ,ebn+apty?

  A new car manufacturer advertises that their car can go "from zerowkx 3i-(aly;lwuw 2)w to sixty in 8 s". This is a descriptionwax);-wy2(wki 3 lw lu of

  An object moving in the +b8 u/zm7ihig.m;2q va x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow dos .lfo:j xo9re y2yiq g*iosta+7 :/l.wn as it approasfyoixia:+ylq2orjge. /*9 .l 7:ts oches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car travc5z-1lz ap55fm of6z;0cpz gceling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning icpg-o;mcp0z15f 6clz5zz 5af ts acceleration.

  Suppose that an objeo9r lnu 36ri7bct is moving with a constant velocity. Make a statement concerning it n r7lruboi396s acceleration.

  If the velocity of an object is zero.dmfp) kp3 :wv zxe9m*, does it mean that the acceleration is zero? Support your answer with an examp m3v.*k)dxf9:epm wpz le.

  Can an object's velocity change direction whe kd4j6d-9.q f,v r+jql; bssmnbej9j 7n its acceleration is constant? Support your answer withbd -9rjmeq74.s ljvk+qj,b 6 nsdf9; j an example.

  Suppose that an object is moving with constant acceleration. Make a statement5a * d:c olx5oh;-ygqg concerning its motion with respect to t5 x:a*;g dc5ygqlho-oime.

  Can an object have increasing sp,ayqovv 1f d 5s6ien2;eed while its acceleration is decreasing? Support your a yvs1,;6faivq5eo 2 ndnswer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of 09je dlv7tn -+kec9pa ice. Make a statement concerning its acceleration.np+ev cl d k7e9t9-ja0

  Under what condition is average velocity equal to the ave7iy9in2 a)p(,dci6cuyae wznxn2 u( re,nd7/rage of the object's ini(rnyu2ida6,px9d (nnec7ia72 /zei u yc ),wntial and final velocity?

  Objects A and B both start at rest. They both accel)n ) drun u(r6cfc3yg.erate at the same rate. However, object A accelerates for twice the n6fc )yc).u3ur rdg(n time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from e(tz4tk 5/pgpu v3 -zwrest. They both accelerate at the same rate. However, object A azg ept4 zpk/3-(v ut5wccelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is releaseo f8z8gxh2 4csd from rest and falls in the absence of friction, which of the following is ho8x 4szf2g8ctrue concerning its motion?

  When an object is released from rest and falls in the absence of friction, wh )-xfl2sk.ilte 5fi+u ich of the followi ustl)5 l.2ki xi+e-ffng is true concerning its motion?

  Suppose a ball is thrown straight up. Make a s6siadq b7hb: hq8c3n1 tatement about the velocity and the acceleration when the ball reaches the highesha8 3chb:iqd7 b1s6n qt point.

  Suppose a ball is thrown straight up. What is its acceleration just before i9oeqe y)8pu m7xl)gs +t ro )9ysgpe8 lq)uem +x7eaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to n4 edjxt8bg)2its initial height. Make a statement about the direction of the velocity and acceleration as 8)bdt4gxen2j the ball is going up.

  A ball is thrown straight up, reaches a maximum heig/:jbq /nq9 m 8byuz/e gp;ff.tht, then falls to its initial height. Make a statement about the direction of the velocity and accelebq9em tyf jp;n/zq b./:f ug/8ration as the ball is coming down.

  Suppose a ball is thrown downward in the abs6;blwk7mq)nrpu g 6+jt ))7 iug.mkosence of air resistance. Make a statement concerning its acm)ggm+;u).ubtl6krn)ji7 q7 wpo6k s celeration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratp3 uh0n +5y0ptg gd :la10ainkion when she she reaches terminal ve pt5dak 3u0: na0g10ln+pi gyhlocity?

  A ball is thrown vertfutcc9a(c5o 5ically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fo5 5 9c(acutcfast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball Bsk/p dib)v-5eksibm k7n+98 v is dropped from the same building. Ad i 97mkvbb5i-kpv es8/nk+s)s time progresses, the distance between them

  Ball A is dropped from the top of a building. One seco :ausfue7 :thv2ye :5knd later, ball B is dropped from the same building. As time progresses, ths2kuvua:e::f 7t5 yhee difference in their speeds

  Two objects are thro :5sq2xvk ;k ow0o8dyuwn from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initi0 q 8:kouysvkx2;owd 5al speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A smtwm(1 p: uck.econd brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of t.:c1wtkmm(p u he two bricks.

  An object is moving with constant non-zero velocity in the +x7wchc/x9w9apsnwb 16 axis. The position versus time grap/679p9caswnb1wwchx h of this object is

  An object is moving with constant nos06uj/ p qh gch)/:evmjg +ad;n-zero acceleration in the +x axis. The position versus tims/mh d:uc; aj0ge)q+/6 p vhjge graph of this object is

  An object is moving with constant non-zero velocity in the + 8zwa) v,nz-yux axis. The velocity versus time graph of this objen u) -w,v8zyazct is

  An object is moving with constant non-zero acceleration ij7cre egm+35 in the +x axis. The velocity versus time grap5gjm +7ce ie3rh of this object is

  The slope of a position versus time graph giv.( rqnej -*jf3ezr zc:es

  The slope of a velocity versus time gr)ag :tg,5dl t4 rd2kooaph gives

  The area under a curve in an acceleration verx a pj(y t-*vnd9b9m6usus time graph gives

  The area under a curve in a veloc/o zs/qc7i t4hity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the o*6eo itgyojv:j2- *j6 rsj*bh bject isij se* j:* 6ot6yro2g-bhvjj*

  If the position versus time graph of an object is a vertical line, the objecz:c q5d po)d9r3- bamnr)4y4r gv:xazt isv4xg)-9 ):rza: yd5 rrpz3mqcnba o d4

  If the velocity versus time graph of an object is a horizontal line, th9f,:n09-gk mx bdkmb ue object i m df0,:kxn9b-u m9bgks

  If the velocity versus time graph of an object is a)r.3*eb90 kotulhbsgw 9 4ukp straight line making an angle of 30 degrees with the time axis 39rpub t94ou .ebs)l0kwh*gk, the object is

  An object moves 15.0 m north als bb9 6z8p9be t5ep/xnd then 11.0 m south. Find both the distance traveled and the magnitude of the di59 pbb/zbse 98xptl e6splacement vector.

  A boat can move at 30 km/h in still water. 0rr(ths bhwz,qd+ :a g92+lhr How long will it take to move 12 km upstream in a river flrbhs+ (q:t2+gr zrh wd,90halowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16(zvc*tig my8g+7y 8narse2 )q 09 m)

  What must be your average*imwdd 0i. r2rxt,f *h speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approxim qsxfyic v-c*7 s79o.eb 0nq;zately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/xy0 9-socq ;.fne* 7ibs7vzqcs?

  A car travels 90 km/h. How long does i c/-+yln cnltr-ma)ds( f,.tg t take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. Thk58c+xsy z l:u8w9d4y4f darm e speed of lightkcfy8s49wr8zd: d+lx45u amy 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 and you look to the sidamjnp q11s3*y(mcl+c gk/q c 2e for 4.0 s, how far do you travel durikc cjlcp2q *1(1+ny/ qsamm3gng this inattentive period?

  If you run a complete loop around an outdoor track (400 m), i)p9niyo;a c.y 4 m,j7uoik qf2pqb +7in 100 s, your average velocity )ii,uy2obc+ ;p qi7aj7pn9m.fkyoq4 is

  A polar bear starts at the North Pol5xe:mek2 yu9 6 ai;stpe. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, : ey6 utex sim2a59;kpthen 1.0 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. Ia4 nywab8 /lj1k1giy 8t 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 avway81 ajn1kby 4 /gil8erage velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It thez: u yf94a6kxin starts to snow and you slow to 35 mi/h. You arrive home after da:ku y x6f9i4zriving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What d*.33*sv-icr3z4djr tvton iis the average speed of the motorist for this tr-t*scn3 jri d33v.* dozv4tirip?

  A motorist travels for8uvdt 6mz-rb hd1/o l5 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the d1m-/zv 8r udt o65blhtrip?

  An airplane travels at 30(bw e 1dlmv3r9ya*zkzf (k ns w4,9.ob0 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the av be*lfo wwnzdk3z(( ak9s4 yr19.m,vberage speed for the trip?

  In a 400-m relay race the anchorman (thgq a z.40lcee:e person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman el gqc e.04z:afor team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes.0-v nx r6avb 5o,1esoj*fje fvd,v7k to a stop after 9 s. The car's average velocity during deceleration was 69 km/h. Whate6vfje,o1r x- vo nv75ksdf*ja0vb, . was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160ra6vx1 .d8 8w4ebbim f m/s, at the average rate of i1eb4wvbx6.rd8 a m f8$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atskh)xnklz s n6j+e7 kq:g* 30n 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 t ep9 i;7nlhs4at $4.0 \; m/s^2$ 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 acz/8t q7kyk;h l4t3 if5vrx*fcceleratio8x54*fzftr c;73i/ vhykt qkln of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initiallz.-8+ c(bshursaq l. velocity of 4.9 m/s experiences a constant acceleration of l.8 b+l(as qr.-hcusz $1.7 \; m/s^2$. What is the cart's displacement during the first 9.6 s of its motion?

  A bullet moving horizont4mf81x bnwues v4mi+99mrxgv)zp 5n-jt 5l.bally to the right (+x direction) with a speed of 355 m/s strikes a sandbag and penetrates a distancesv4 j 9pl4b58x.etz)wmmni5gn mv -r9 1bfu+x of 75.01 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launchc(frlslb.x ae j-cp vt-. j f/twu3)y(b2j/ g1ed from a catapult on an aircraft carrier. It reachvfg2x-j. e/lpblc)3 tuw ab.s-rc /fjy( 1t (jes 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 catapult?

  A car starting from rest moves with conszcvb( . ja5odh 55j5cq5 ctsp6tant 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 80 m/sl dv 9k7y*jom.95 cuho in a distance of 200 m. What is its average accev k. m5*cl9oodh9yj 7uleration?

  An object starts from rest and undergoes uniformqc,0iyk b0 qki9*)kbrgc;;mo, 5bmjd acceleration. During the first second it travels 2.6 m. How far will it trav 0jibc;9 0k,k;,giqdb5) rqbm myoc*kel during the third second?

  An object is moving in a strn)62kcqt wmtg85i gnw mo,7e+ w hf-w(aight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. H-tqfnn ok2wew hgt+ c875w)mi(,wmg6 ow far does it move during this time?

  A car starts from rest and accelerates un7ef/ycjidx3h .t2 /8n qy;st-jigc1 piformly 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 q7(vy uei sb7,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 traffidl*(amaox.x ;b3 lzy6c light turns green, a car that has been waiting at the intersection starts ahead with a c*a lxbm .y;lz63(dax oonstant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s on the surface of planet X whe303ucsgsp x (yre the acceleration due to gravixpu s3sy(30c gty 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 tw/o5i m 6sy6;l.6vfp hvi4doc he surface of planet X where the accwipo / .fi v 66d6svc;y5mho4leleration 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 upw:oq b6wfn,ta03e :wooard with a speed of 15 m/s on the surface of planet X where the acceleration due to gr:e: aw,o6ofbn03 oq wtavity 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 wyw tnkf :tb/86egsk)v;np5wz y01myic,z m4; ith a speed of 14 m/s on the surface of planet X where the accelev etnk,8 t5:z;nkp4y; ym 6iwfbg0)yw/1 smzcration 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 your fripfn i1*fipylg4nio,ah n* 59w h853y fend holds a ruler between your fingers and releases it without warning, how far can you expect the ruw*yipo nhg f59 f, 3n1yan*pi84flh5iler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/szvrf ql8 gk*fx.wa- 5tlib;0 2. What is its velocity after 3.0i *xf0 wgzrkl;l .f5av-2tb q80 s?

  A bullet shot straight up returns to its staocm7f,9ni 0 xbrting point in 4 s. What is the initial spfb09 coi mn7,xeed of the bullet?

  A ball is thrown straight up with a speed of yohbm9o.p/* w36.0 m/s. How long does it take to r mb*w h9oyp/.oeturn to its starting point?

  A ball is thrown downward from the top of a building with an initial spw-sek)imdw xbcj.l (35 ksxj+h9zxe*1-m f-peed of 7 m/s. It str.bwmjm( x+3sfl 9xw i*j1 -pxkce)5 hds e--zkikes 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 fill in numeri2cs+dht vm-.1*o ko n0hd71qo f6p dorcal value t0f+do6d 1hk rcn oovs do*12phq.7m -in the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up into the air with a speed5c h+oqi6: fnw of 21.4 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 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 is the velocityo)ecvv 4ez.ea05t(4.cn q r hc at t = 1.0 s?

  In Fig. below, what is(x 9iaug 87 c1und1..a .vdmjk u9gh 5rm1ozjx the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.-xz0w0zd.o8 y3r- d/uh hgq kt0 s?

  In Fig. below, what is the velocity at tus32xv5c j:wjyro 72 b = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?8 t0vs35a )/(k nbnfaa0 iadli

  In Fig. below, what is the average vev2 8g8yncn/vulocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 so hho47v:e,8 trs q0cw?

  In Fig. below, what is the accelerat ae5p3sz xl ksrvddy2*)ekd+p m)97b)ion at 3.0 s?

  In Fig. below, what is +e ly5dmho9)b eg 7w*5 ue9vlbthe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration j+yv t;0y,xpyc,- nnmfrom 0 to 8.0 s?

  In Fig. below, what is the displacem uh ;yj/nf,enl9i)7kcent from 0 to 8.0 s?

Does a car speedometer measure speed, velw g:as4:8rma1yxnr x;ocity? {speed|velocity}

  An object can have a varying spe69c9 kh( esjrpc0r1 oiu:whj1r o yn9+ed if its velocity is constant.

  The velocity of an object can be ne twt-y1d,cgn)bc5kfgr;n6 tf .g6 5xcgative when its acceleration is positive.

  If one object has a greater speedws1+ ls: ps,0ym x)irvo;j9io than a second object, the first must have a greater acceler o)s r1+i0i wj; 9ylmopxv:ss,ation.

  Two cars emerge side by sijg f8y(l(;th kddej1*de 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 dfzt8gh x o8s8k:)m w2dwu +c/speed as its acceleration decreases.

  A baseball player hits a foul ball straiga ikn 1iwv/.n :ti4jpx:ip s+7ht up into the air. It leaves the bat wi4+: a/kiwpv1t 7 in nixisj:.pth 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 happening to its ac/ zsoe.mq0,h m-fo8 kgceleration, how does it change if air friction isozh.km o,q/me-g8s0 f ignored?

  As a freely falling object speeds up, what is happening to its acceleration, ,mumj4xinox,.n*li ; how does it u i;m,lj4i*,m.onxxn change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originhwq 8b498 t zh-1xb:r/ aihzcxal position with the samhabhx9:ibwzt rh8x 1/zc8 -4qe 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 zero veloci )sx2. g+btxpn2.ni3wabx - tjty and nonzero acceleration at the same time.

  An object can have nuzu1l:frh/ytj7 r s;pwm2 (* conzero velocity and zero acceleration at the same time.

  An elevator moving from tj+oiec /g rw.,lem; -mhe second floor to the fifth floor making no stops along the way has zero accelerc gm, -me wo;lre.ji/+ation all the time.

  A rolling ball moves fra od 1br-a.6u0cugbw mivy2e. ot.f54om $x_1=3.2 \mathrm{~cm}$ to $x_2=-8.1 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ 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 $t_1=-3.3 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around ics ax6.v bneg6*9d7ha quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from+8403dgtws cvov6 g yu its trainer in a straight line, moving 98 m away in 12.1 s. It then turns abrut+ sg6 ug8vyvowc3d40ptly 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 frt(g lkv boxa1864: 4ce/ oxgrqom $11 \; m/s$ to $22 \; m/s$ in 5.5 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down fro3gz4l :s9p3hibl q *qzm $22 \; m/s$ to rest in a distance of 57 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ou7s vqjv.e nlv884e8cf $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blog:z b/g*( 97:bx5wj ef aaghlscks to essentially top speed aboufh e jgx5z*:(a/: lbga7 b9gswt $11.4 \; m/s$ in the first 13.2 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 uniformlyu +h-ir3ct g:l*s qki* from a speed of $16 \; m/s$ to rest in 5.15 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a ca -52uj-zmxnrc.+ evg 9e w (e/yogwov/r leaves skid marks 92 m long on the highway. Assuming a dece2e // e9w jurgv.zmg oxnwo+v ce5--(yleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go51x*q,q0vf b ys9+vx* ipbed zing $25 \; m/s$ 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 comgd1l7l 0s e1pgplete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are 1gpl 0se7lg1dstill 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?    $s$