Suppose that an object travels from one point in space to anothi2zs3sdc5ayz . evkg ica, (*em;h* +der. Make a comparison between the displacement and the diyv s2*z.c, h;cie3akz*ea (g5dms+id stance traveled.

  When is the average velocity of an object equal to the in r2f v.x-q 7;khffhhc6stantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero ( zep+:xl pw9zpnv 2f9to sixty in 8 s". This is a description 2+p9wzxl:9 zfp nv(epof

  An object moving in the +x axis experiences an accelerationmqpanzz1v5 6, of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Easth) z; zml0-deb (+x direction) begins to slow down as it approaches a traffic ligzl0d ;me b-)zhht. Make a statement concerning its acceleration.

  Suppose that a car traveling to the Weswhdrhyf1 +b)b e 7 e:f.pl-2lqt (-x direction) begins to slow down as iterldw)-h: .f pb2+q 7ehb1ylf approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant veloca5g bf35rv,dx0 j cz+lity. Make a statement concerning its accele35fz+vg,lxrj c0 bda5 ration.

  If the velocity of an object i2,j*mb+4qca1ndli a /y)zkiq9vd ou 1 s zero, does it mean that the acceleration is zero? Support your answeid,k 29cavayq io*u n 1b j1d/+q)4lmzr with an example.

  Can an object's velocity change direction when its acceleration is cons n;.( 7jxdrgci9xg 47q )otieutant? Support your answer with an example.4gcux ( iig7 jxe9odrn qt.);7

  Suppose that an object is moving withc/yq, x3 jxbau /1lu3i constant acceleration. Make a statement concerning its motion with respecq3ai3 jcbu ,x/xy/l u1t to time.

  Can an object have increasing speed while its acceleration is decreas4jjn.aklsp3 w-s r0c *ing? Support your*jpl.c k0 rn3js-aws4 answer with an example.

  Suppose a can, after an initial kick,4usiid 1jj ,t1 moves up along a smooth hill of ice. Make a statemd 1,4u1j istijent concerning its acceleration.

  Under what condition is average velocity equal to the average of the 99wmkfujg3 9k object's initiag ju39 f9kmw9kl and final velocity?

  Objects A and B both start at rest. x1 47;k8se so5vofjh 5d/hc mmThey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of obj8osdhe f4m 7x/1j;hv sk5m5c oect A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the sar33 s fes6ctm/i 48vlwme rate. H384ve 6w sf3li/t csrmowever, object A accelerates 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 relea192 ij+ag *,9bbkt rknf7ssej/eq/usu q5m9c sed from rest and falls in the absence of friction, which of the following is tkfiur5be *j9uqgsb1s + t jc/em/9s an29 qk7,rue concerning its motion?

  When an object is released frodv uqb5 i*o mefg2h8/ims ,4))wfz/dfm rest and falls in the absence of friction, which of the following is true concmw/)ehi dvzgff)2o4 ,mq/5sdu* 8i b ferning its motion?

  Suppose a ball is thrown straight up. Make a statement9 p 4im8.yypfe about the velocity and the acceleration when the ball reacmie4 fpp.y y98hes the highest point.

  Suppose a ball is thrown straight up. What is its accjra1:;q d6 tn:p7-dgxh 73ndgout )nneleration just before it reaches its hi tan ntdg1;nu: qxp jon:3-d7)7d6rg hghest point?

  Suppose a ball is thrown straight up, reaches a maximum height, tz557pm mszx 3ehen falls to its initial height. Make a statement about the direction of the velocity e 55mpmzzx3s 7and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum hei (oamesmb;1m/ ght, then falls to its initial mme(1a mbs/ ;oheight. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrownr);k q4o uytu;y/p ez0 downward in the absence of air resistance. Make a statement concerning its acceleryk/u4;zr0o q)t yu; peation.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whu069klpama q* w8vce1 enc u8 aw0mp6e*kqla1v9 she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secok30vr q6yi(njnd ball is thrown upward with a speed 2v (q(ivj0kn r3y6 twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, baiua-f qc4 sw3tg+.z gakzy: 60ll B is dropped from the same building. As time 0+a aifq3gwzt6:y4g z- ck.usprogresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is ky 0m;.j.mqlhdropped k ;hyl0q.m.mjfrom the same building. As time progresses, the difference in their speeds

  Two objects are thrown frombi bi/ms2a86lft3wv 5 the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial spee f8vmbs5i2wi 6/bal3t d. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straiu,im, 1 z 0haye5cug0qght down from the same building. Tcg, e1h05 y,uiqmu0z ahey are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero veloclg8yf r6l.fjl: .8s 3gdw,yrtity in the +x axis. The position versus time graph of thijr llgw,.r:f8s8 gft d 3yyl6.s object is

  An object is moving with constant non-l:m0kjz/2 x cnzero acceleration in the +x axis. The position versux/ lj:zkc0n m2s time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocif2ptm7xj +ns sj7; 2tdty versus time graph of this objp+f72m7xstj nt 2 jds;ect is

  An object is moving with constant non-zero oj84 x+fl)i*oop)b mkbl)v6u acceleration in the +x axis. The velocity versus time graph of this object 6f)j)+l*bvo4lxu oo bi )p8km is

  The slope of a position vn7q06wqf n.aj ersus time graph gives

  The slope of a velocityck7gbf5wgi+3 1xq.demexh)do 2/qu ; versus time graph gives

  The area under a curve in an acceleration verpb;dr8(8ek )gdvkhzd:g 9 ;ni sus time graph gives

  The area under a curve in a velocityb)im e +r5n0kz versus time graph gives

  If the position versus time graph of an object is a horizontal line,0( 6 j2o0hivtqwlw n2u the object whl2o2w( jn u06 v0qtiis

  If the position versus time graph of an object is a vertical line, the 6/sa6)i bdk yp0e1/2m3gdz1w fnm rkvobject isp3 61)0v skdfd1m g6ka m//w 2yrniebz

  If the velocity versus time graph of an objecjz.2eo-hus d,.uh iq*t is a horizontal line, the object is2*j. q oeh sd,h.uiuz-

  If the velocity versus time graph of an object hg ,.ij1vwtf 2is a straight line making an angle of 30 degreesvh.2g1j itfw, with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m soua e*my3*n+yi 5m ,u0shfsiz 4oth. Find both the distance traveled and the magnitude of the displaceme4hfyn5zu3*ii,0 y*am+ e omssnt vector.

  A boat can move at 30 km/h in s8s8 ,,g c r wtaa-2nqb/px9hgatill water. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?wsnbca gr-8 2xaa ,t/g9qp8,h

  55 mi/h is how many m/s?n6;0powqn t 8k (1 mi = 1609 m)

  What must be your average speed in orderp +08ne s9glss8zh. jb to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. r+ybqle b. ,vf5 3nwi:5mgg1n What is the average speed of the n:m3y.,l gvgbqn5w e bif 5r+1runner in m/s?

  A car travels 90 km/h. How long does it . bwz zr5 ji4fq;adc50take for it to travel 400 km?

  A ly (light year) is the distance tz q 4*dv3p vm3a.;9bxhv*q. o+j pkjakj)/x qmhat light travels in one year. The speed of light is aqpj9*jq3+.v);kjh m3/xvomd4 bq .pvazkx* $3.00 \times 10^8 \; m/s$. 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 asgh a;2-u tpkiw4 5zj;nd you look to the side for 4.0 s, how far do you travel during this inattentive period;5-z ih2tw gsp4 j;uak?

  If you run a complete loop around an d 8hd f4r3 yc1h)lxur-outdoor track (400 m), in 100 s, your averaghd xfhr c)y1u4r38d- le velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km easvw2yxv6;w6)xl v iz.yt, then 1.0 km north, then 1.0 km west to return to its starting point. This tri6 y lxvv 2x;vw.zwyi6)p takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south,r;sf;w ggm8us)+ il4t then 1.0 km east, then 1.0 km nor+wmis)tggl4;s8ru ; fth, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at n r2blul25+k q55 mi/h for 110 miles. It then starts to snow and you slow to 35 nbr llu5k 2+q2mi/h. You arrive home 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 at 100 1k7vldzfe-uc 9m 8i6bkm/h. What is the average speed of the motorist for t 1di v7lc8fm -z9keu6bhis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h.v/ v.s o bs;mvep+f g,d+hvgd s5m4v5. What is her averag+op .5mv5she/svdvbvv;,dfs .4+g gme speed for the trip?

  An airplane travels ad6yrb0yk eo(9+9/uht6 fkf f dt 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What isk9/( o+9ytubhefk0dy66r f fd the average speed for the trip?

  In a 400-m relay race the de n9gwzkl(jx-.3b- wu+4g+oln ykh+ 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 than wyj-3+g9gkk-eb4nz +l(ud l+w. h oxt the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 9 s.,a.ide phd3n / The car's average velocity during deceleration was 80 km/h. What was t/n id,h3pd.ae he car's deceleration while slowing down?

  An airplane increases its sqk0b -5uyjmqr1s* m:f0ol v,gpeed from 100 m/s to 160 m/s, at the average rate of b0ouq v, :-f5kj r0gymslq* m1$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kb8z 4b6 2d df/6hxhpagm/h accelerates at 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 accel+)w4 s.j-py(qsdzsb oerates 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;mnfrjhsy 3 y8t6)uvx3p+hyt1 77wto 10 s. It then speeds up with a constant acceleration of68u ty7 7;tx1+jhvnyhpy3w3)ts f omr $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.8 m/s experiences a constant acceleratihuwz)(p m9wo6 on o( upo)z9m wwh6f $2.4 \; m/s^2$. What is the cart's displacement during the first 5.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with wnikqbt pt5jhy p, s0vw:6r4ud1 /h,sw*hg2 ;a speed of 401 m/s strikes a sandbag and p,uwsr,/0yj kt;2in :vw6p bp*hh4 hd1wsqtg 5 enetrates a distance of 16.32 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a mh2at b (0r9gglt g+frdd5499zu: lgccatapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapg+05l9mtu za4f hg:br 9dgtd( r29lcgult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest mgk* b:z2-zcwaoves 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 80 m/s i5p-apl:h,x8yb hm79 tf:yju r dah3v:n a distance of 200 m. What is its average acdyj,::y pax rhh8u:7v5 fl93hpma- btceleration?

  An object starts from rest and undergoes uniform acceleration. Dur ibdbb;,u n; i,ezor3/v cf;e+ing the first second it travels 1.8 m. How far will /; eci+urb bnvfdiz;,;o,eb 3it travel during the third second?

  An object is moving in a straight line with constant acceleratio-qf zgd6*ai7/4v c wmjn. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during t*gzcjq6mwav-i 4 d7f/ his time?

  A car starts from rest and accelerates unifyd,: yz;by c17ju6 qw1 ks-skformly 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 ca;j 6vr ;efg8cjn 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 z 1ud)xnp92x 0u5 deqy7tn5fwbeen waiting at the intersxxwyt5dzp7qn 0fn u 9) d21u5eection 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 speedtkd/m w6,fy7 ndrd855lins o(. :e uao of 12 m/s on the surface of planet X where the acceleral5(teu85od7/: ys d,.oamf6iwnn kdrtion 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 1bgz:txl .39 ut j,*7tkz eh5ny2 m/s on the surface of planet X where gt9l* 5 et7b3y:nz,zkxjh .ut 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 tw+i5z,yenms ,ya:8mom+v- oa speed of 15 m/s on the surface of planet X where the acceleration due tov- me m +5o+m,y 8nsotz,aiyw: 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 upeqjt7o544xhk lq3uz2ward with a speed of 14 m/s on the surface of planet X where the accelerat5u4qljo ht e2qz34x 7kion 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 fr d tutuhjtidthg15.c - u+d**;iend holds a ruler between your fingers and release;tt+udi**t-h ugc.5 hdudj1 ts 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 19.6 9l3.eu,ul r+xld -3kx0jkd mjm/s. What is its velocity after 3.-dxk ,+ujl l. lxrm3d9ujk30 e00 s?

  A bullet shot straight up returns to its startj75u 0vz gop-2g edi6qing point in 15 s. What is the initiap vq7dg5uoj ie-62zg0 l speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it takb6 mu71r- )t0gxpv,)lc kfgon e to rcr)-gpn7mot gkv bux ) 16,lf0eturn to its starting point?

  A ball is thrown downward from 2vznx)ifx5:y -w l)6 jdy0lwpthe top of a building with an initial speed of 20 m/s. It strikes the ground after 7.2 s. l jx w -n)flpyivd)yw6 205zx: How high is the building?

  A ball is thrown straikx:czrw/: v nb:y1d2 ight up with a speed of 30 m/s. (only fill in numerical value in thevyr :2c: xz:ndbiw/ 1k 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 speed of 21.3 m/s. do )rkh4kqczf-)-: rh (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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vel bxpe. tlfny8(g1h1kuwz:/z6a :xxfxx9 qj :/ocity at t = 1.0 s?

  In Fig. below, what is the velocity atpf a (z:8zunsmyf+w6 zzlqrj)4u. 88k t = 2.5 s?

  In Fig. below, what is the vj7rd w:lr 2we6elocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s?dvw:.cvxx1h ugl7 ))+j8y8qc +j h env

  In Fig. below, what is the average velocityexsju z6 :w-4i from 0 to 4.0 s?

  In Fig. below, what is the average velozb/0n (5d hikicity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a 9jnv bbi6k9:pt 1.0 s?

  In Fig. below, what is the acceleration at 3.z:0 9.xuzqa y,j(xuuj+)acsa 0 s?

  In Fig. below, what is the average acceleration from 0 to0n hov; ntqbd 2nbn862 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0ei2ormei ,0j 1 s?

  In Fig. below, what is the displacement frcy e 4s4mssq3.gl7ir, uvo5 q/om 0 to 8.0 s?

Does a car speedometerwj u2vm7z y:q- measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocitx,i) g 9tku8(l*zw bzoy is constant.

  The velocity of an object can tz7:ls-bcz8- j l5ypy*s+isebe negative when its acceleration is positive.

  If one object has a m88 m7 uw2si2ccw6.aabc 3i30sg hcbzgreater speed than a second object, the first must have a greater acce 38i802i2cs3bm7ugc.c wa b cwzhsm a6leration.

  Two cars emerge side by side from a tunnel. Car A is trav1qt0 7p: :npaep91dxp zyp dq/eling 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 incr jp+4wtq vz d)n,ajm-39u: sxeeasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the a:6mp 2te g)tlwir. It leaves the bat with lgm6wp2: )te ta 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 spee9h2kitkfe9t 9 ds up, what is happening to its acceleration, how does it change if aifh9 9 tekt92kir friction is ignored?

  As a freely falling object speeds up, what is happen 3rzmq :mfy 0kphcpo 1m8w1*d5ing to its acceleration, how does itfc03*ymo 5mphqrwz1p k 8dm1: change if air friction CAN NOT be ignored?

  An object that is throw7hvgc 7q;ksk,/df 3 v8cwaxs*n vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resista3 sw/cgsva77c8*k q h,vdxk ;fnce is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same timmn dks: o*(+ ix+pek4ee.

  An object can have no;xta8 exijr/kf*m-u( y 7kz:enzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth flo3b zv 8o :z(9ulelyzw*or making no stops along the way has zero acceleration alulzzyv z *o3e(bw8 9l:l the time.

  A rolling ball moves frj8wwn/(r 1oaeri-;z w kb- t3cjsb/:kom $x_1=2.8 \mathrm{~cm}$ to $x_2=-8.4 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.0 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarterwtlc8hw4bx5 + -mile ($1 \; mile = 1609 \; m$) track in a total time of 10.5 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, mov -bgknhcvxq-8cb*ju k 6v0i6 )ing 105 m away in 10.5 vh8c)nbv0x-6ick guq* j 6k-b s. It then turns abruptly and gallops halfway back in 4.7 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 frj iyiq 8pcnp:3 hhb e7,(u zw8+6uphg2om $12 \; m/s$ 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 frowjm4go6q;*z pa11ewnm $21 \; m/s$ to rest in a distance of 80 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach 5er pmx1 gy,6ia speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks topm)at/oly/ip *mh8 v utv-x3+ essentially top speed aboutm uv/-x )lptiy+t *pha/v8mo3 $10.4 \; m/s$ in the first 14.7 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 fro 9-8l c ft 66zkwbdutp3ig(jv(m a speed of $19 \; m/s$ to rest in 5.20 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 on the highway. f/sq q/ za+m5rAssuming a deceleration o//rq 5mqs+azf f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going obtitz+j;5 7y$25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less tkwbzw..m, sr7han 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runnw m rkzw.s.b7,er must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$