Suppose that an object travels from one poj68wodnyyfujw0 3s mr 49;tq5int in space to another. Make a comparison between the displacty owy dwqu9m38 s0 n6j45fr;jement and the distance traveled.

  When is the average velocity of an objf4f9z-helr 1mect equal to the instantaneous velocity?

  A new car manufacturer q+dy4i i vq+3br* (ytpadvertises that their car can go "from zero to sixty in 8 s". This is a description of3dtbv iqp +*+yyq(4 ri

  An object moving in the +x axis exp/ *z/6g kwj c9czaft6rmebf,6 eriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begi8oxvnxia2 , (dns to slow down as it approaches a traffic light. Make a statement concerningdnoivxa (8,2x its acceleration.

  Suppose that a car traveling to tr5p x/ sbvjo6s1pvg. 6l3qnt .he West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceler6v3 /gpt. x pssvonbr 165jql.ation.

  Suppose that an object is moving with a constant velocity. Make a st 3baeyo;xsiqq-.413g jg8/, nwjtw syatement concerning 8 j,ixgyg;wts3ey.1qj awn3-sqbo 4/its acceleration.

  If the velocity of an object is zero, does it mean e 8-,te*firx ucx8ka 6that the acceleration is zero? Support your answeur- 6ek8 cf,8ta ixex*r with an example.

  Can an object's velocity change direction when its accelerarouanmd1aqly. 1 a;8s,g3lp (tion is constant? Support yo 8ud 1qollaym. na3g;1sp(,a rur answer with an example.

  Suppose that an object qxq)9ig6ya 4; xu1 nxuis moving with constant acceleration. Make a statement concernixi6) 94gqn1;xu yq xuang its motion with respect to time.

  Can an object have increasing speed while its acceleration is d;mqc. d aql b;io,zv0,)b4k gikc4hi8ecreasing? Support your anc,qk biki ; a.co) 40z,4idb ;g8vmlqhswer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. dh6av,6 (yksx1. 6i wcqvzp.o Make a statement concerning its acced.61q , 6( sazkyhowv6i cxpv.leration.

  Under what condition is average velocity equal to the average of the o8c)p0)ev h(nn,de ahhba*xem :;a6a gbject's initial and final velocity?n* n8aed ;)p): maacg(6a h,0 hhbxeve

  Objects A and B both stahzgu 2 e 5esk k,8os)*p)q (7clxdab;grt at rest. They both accelerate at the same rate. However, object A accelerates for twice the time a)7 o8g( expbe*zslcg ; 5ask)u2q,kdhs object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from re* *l qf2 ar);xklgxg6 c1fas 3ghdci/,st. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A comfg xg6ci/; r cslkqxfg,1alh* )d*3 a2pared to that of object B?

  When an object is released from rest and falls in the abseyshllhx: 3in0 8n+yg5 nce of friction, which of the followingl0:y ny8g l xhn5is3+h is true concerning its motion?

  When an object is releasednw :plr3d ,u8 m2q/whv from rest and falls in the absence of friction, which of the following is true concerning wm hlnr:3 ,2/vdqu 8wpits motion?

  Suppose a ball is thrown straig6.we zju v--wv uz(6ahht up. Make a statement about the velocity and the acceleration when the ball reach. w6 zvhv-eu-wu6a(jzes the highest point.

  Suppose a ball is thrown straight up. Wh 2lm91q5bxc:dfs bl+rat is its acceleration just before it reaches its highest pomd+sb9qrb2 x llc51 f:int?

  Suppose a ball is thrown j5vf;dah8 : m6sql3z- t.vgcmstraight up, reaches a maximum height, then falls to its initial height. Make a statement abouv zj3.6: lfcqasm 8t;-gdmh5vt the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls tocwg jww; h*,7n its initial height. Make a statement about the direction of the velocity and acceleration as c7ww*jhgw; n, the ball is coming down.

  Suppose a ball is thrown downward in thx/jrs r,a ;c/v7phc+l e absence of air resistance. Make a statement concerning lr hrxv,+ c/c/spaj7; its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is; fun uf-m( vo-+;i)m8osf rjq her acceleration when she she reaches t mmuv+fn8o fs;uf ;rj-)qi-o(erminal velocity?

  A ball is thrown vert2pg7 zd07r afd5x 3wkxically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the secordf35wx07dgk2 7xzpa nd 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 toqm-6zj y2 +zdwp of a building. One second later, ball B is dropped from the same building. As time +jy6z 2w-m qzdprogresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B dnk7y3,:gtcug8 )n1s qxaa ,wis dropped from the same building nas7wn c:31gy,akq8 ,dt gux). As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up2co+:*hw rgeh, and the other is thrown down, both with the same initial speed. What are their speeds 2c:wghh roe*+when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown stu(m ffz:w o1).h av1pxxf/n5iraight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerat 5:xhxumfv)p/(oza11wf in .fions of the two bricks.

  An object is moving with constant 0oua(a6ka 8z rnon-zero velocity in the +x axis. The position versu u azk(a0a8ro6s time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axi/9qf xjo .az9js. The position versus time graph of this x/.j 9jaofz9q object is

  An object is moving with constant non-zero velocity in the +x axis. The v2my-;doex /tuelocity vertd xmeu/-2y; osus time graph of this object is

  An object is moving with constant non-zer +/ne3cb/oa zno acceleration in the +x axis. The velocity vebc+/oenn 3/zarsus time graph of this object is

  The slope of a position versus vcpk( v1o9czb7.kn9w time graph gives

  The slope of a velocity ver45: fmcwtr m-pt4 yobtn 9oek6 o7f,qic(m :k-sus time graph gives

  The area under a curve in an a5 s-c89zv grh+a2iduf cceleration versus time graph gives

  The area under a curve in a velocity versus timzsy4r63 * kgo baei-;9f*sct fe graph gives

  If the position versus time graph of an objecqv 0)zv4 dk*zh4cy9o0+aqck rt is a horizontal line, the object 0dcqqvk4*kcaoy)0 r hv9+z 4 zis

  If the position versus time graph of an object is a v3 bw mrm248 tacmsx19oertical line, the object is3rsmt4 mwx2cm9bo 18a

  If the velocity versus time graph of an object is a horizontal line,p 9d4tza9nld1 (y:dle the object i:p9a9d( eddzly4 n t1ls

  If the velocity versus time graph of an object is a straight line makinb0j ait7qi17a m ,/ukcvb )wnm8. afc7g an angle of 30 degfi0nb7q71k ajw mma)/7u.bca v,i 8tcrees with the time axis, the object is

  An object moves 15.0 m -b vfi7s-:ya*6jqgejtdg0)w c4.xlx north and then 11.0 m south. Find both the distance traveled and the magnitude of the displ76bc.jt 0g sl f4*aqyewj):d vxix-g-acement vector.

  A boat can move at 30 km/h in still ww wmjxc2esrm+:+ ) r l;l1z4saater. How long will it take to move 12 km upstream in a river la12)z slmw4m+sw :+;jrrcxeflowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = xt 5h,;, zc apnia8xg:1609 m)

  What must be your average spe1atu a 8w,cb,wuc g, tn)/j7ired in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in7tc5jd c:)/ 8hhg(c ld+jwayx 2 hours and 57 min. What is the average speed of the run )d +ca dj(lcjyh5w7gh8ct/:xner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 k, 01t :lk9 ;xred7romxyl)4nu sy9ynnm?

  A ly (light year) is the distance that light travels arkw , vl)u- aw2(m/ssin one year. The speed of light -k ,mww /ura2 ss(v)alis $3.00 \times 10^8 \; m/s$. 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 fqb9m/ l0p 8rwwlj9x 2for 4.0 s, how far dox2p 9ml8 jblw09fw qr/ you travel during this inattentive period?

  If you run a complete loop around an outdoor toyiht4:w gb i/t54 60 plmewx,rack (400 m), in 100 s, your average 4xt l ow /5bgy:pwm640i,hite velocity is

  A polar bear starts at the88x0mt 3oxwkm) y i7si North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to returomiixtm3yx8)7k ws 08n to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 -v8f( (o ik/vu:chfl rkm east, then 1.0 km north, then 1.0 km west to return to its starf-v(l c:k(uvf8h /roiting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. Ity:.w od vv:qi* a5e.dhqk3y 2p then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours . yya qk ::h*523e.q vpidodvwand 15 minutes. How far is your hometown from school?

  A motorist travels 16jz4bcfd u9 2g 1hns)k00 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motori4 z9dfcs ukb1 g0jn2)hst for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 k lp 0ufhk2z1wat l7+u)m/h. What is her average speed for alz7)u10f pt2 h+lkwuthe trip?

  An airplane travels at 300 mi/gosx/dk/adh a*5 i1vyh 4 i0):q utdr6h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the averageak u4r6 vddg)/ihx5* 1oy/ dti0aq: hs speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 c 9;hbyk xc(xc 1wi6p2m) for team A can run 100 m in 9.8 s. His rival, tcwcp16c 2;ib yxh(x 9khe 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 runner not lose the race?

  A car decelerates uniformly and comes to a stop after 10 s.a3 ll;,npte t8 The car's average velocity during deceleration was 77 km/h. What lp,3t 8e;la ntwas the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average 5pku kr;br 2cw,*e7unrate of r5r ;7cuk pw,ubk2* en$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the 582aaszky3ivpn , w-z g,hzt3 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 acjh rmvpis*fcc3al v)4;bhr+q860 1 vqcelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then speeds up with a constant accelera 1qjuqtk8-n1btion o1jnq q81buk-t f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.0 m/s experiences a conff1 9 k ae3n 6dlw:jsm3fwch+r +so4v-stant acceleration o 9- 1o 63ealfsh4nmjwf v +3+dfkscr:wf $3.4 \; m/s^2$. What is the cart's displacement during the first 6.8 s of its motion?

  A bullet moving horizontally3h t oq4ki93ur uw(ac( to the right (+x direction) with a speed of 519 m/s strikes a sandbag and penetrates a distance of 61.50 cm. Whatqok4ih r9( u3uc3a(wt is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carris: t8rno fd,*if(wgv ar3h6*v er. 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 catairrv 3ftn:8o* 6*sw(fh,gd vapult?

  A car starting from rest moves with constant ac*(l4tz +xfh71w3g bmo, p(ux , ugmqr(p.en tfceleration 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 distancvcf;ox8x+ g j .f-nm)ve of 200 m. What is its average acceleratxo8 x)nmcff+jv v.-;gion?

  An object starts from rest and undergoes uniform acceleration. During the 64j5ywqr*:zst n n j,afirst se nysw,zt6 ar:j*nqj45cond it travels 9.8 m. How far will it travel during the third second?

  An object is moving in a straightsvs ,3j*o(g/l cpkj:w line with constant acceleration. Initially it is traveling j:og3wls*vs ,c kj/(pat 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 accelerates uni+a6hv 4zifkz )formly 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 nw)vszs,(r g,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 teiye+ledx je;+8w 1e,urns green, a car that has been waiting at the intersection starts ahead with a const8+,je1ide+ey wx e le;ant 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/x 6hq7.) * hnyfwhnw+xs on the surface of planet X where the acwhfx7x )h yn.hwq*6 n+celeration 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 dyza,z4)s s0m where the acceler)d,smzs0zy a4ation 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 wi vf66a5mf 4pvnl4x 0keth a speed of 15 m/s on the surface of planet X where the0elmx f6 6kv4pv54fan 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 u* x03d,0vta auw+ric3evgl h6)/ak t mpward with a speed of 14 m/s on the surface of planet X where the acceleration due to gtxa)0wgadme+/ t vac3 *liru6h, kv03ravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually .j k, gy5d3h,vdvzx8zgreater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall z.kv5,d8dzgyv3jxh ,before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s5ann pxo)w,eqe o*mgm l9/f86. What is its velocity after 3.00 wl fpna,om on8 *xmg)/qee596 s?

  A bullet shot straight up returns to iphg)vsm ; c.(dts starting point in 5 s. What is the initial speed of the bullet)mg; d sh.cvp(?

  A ball is thrown straight up with a speed of 36.0 m/s. How li5-a jd o 7/d:6pxjdgxong does it take to return to its starting pipd adx-d/x7j j6o5g: oint?

  A ball is thrown downward from the top of a building with an initial speed 5xg * rn9v (8n*ca)hthir;tmd of 28 m/s. It strik**i9 nnd(th5h cg v)rmxa 8;rtes the ground after 3.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical vtyc)hpdx*5bt8(rvtj t hv5q189 4 qmdalue in th 84t9m )q dt8b15hrt5vxdcpvj(q*tyhe 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 wi5xavoi; fhvs d2a;+;lth a speed of 47.5 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 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 veloci-fsv pu-, f9wee;4i;s:cm cmmz h8d7hty at t = 1.0 s?

  In Fig. below, what is the velocity at t = icgtly(-q+c*m6pb : rhnagrva ;:- fh8) nu:g 2.5 s?

  In Fig. below, what is the velocity at t = :f rhjni 99+cn4.0 s?

  In Fig. below, what is thera6ntl c*)wlb4a 9ft )cv3o .y velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0:bqke-*i uyi0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 s?oxq g: q8gl12h

  In Fig. below, what is the acceleration at 1nn+,te liki0 vpm4(q7 .0 s?

  In Fig. below, what is the acceleratif7j ei27l0w fson at 3.0 s?

  In Fig. below, what is the average accelerix(6/ ,i4e-k qj j8zk b6updoqation from 0 to 5.0 s?

  In Fig. below, what is the average acceleration fro3dytc p+irno* ffop 9j)/ n9)jm 0 to 8.0 s?

  In Fig. below, what is the displacement fromh x(:qdw52 plr 0 to 8.0 s?

Does a car speedometer measure speed, velocitynja4zc q*q; uijmvwyih3; 6-7 ? {speed|velocity}

  An object can have a varying speed if its velocity,v5hfmsi :+k t is constant.

  The velocity of an obje/0j sto1fft2df*na9 o ct can be negative when its acceleration is positive.

  If one object has a greater sl b;ylz+6hy re.b7.iopeed than a second object, the first must have a great.y.y; zre7ol6+bi b lher acceleration.

  Two cars emerge side by s5hg2h5;.g f6 jfytssfide 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 .f)i5cs4 gge yin speed as its acceleration decreases.

  A baseball player hits a foul ball strvrm/4l 0lwqu4 aight up into the air. It leaves the bat with a sp 4/lmr4u0qw vleed 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 accel6dc/lho5p -6w7yv 3pr ;2wppey9 ftoreration, how does itlo5r 9ptvh e2 ywo6fp;prp3-6c7 dwy/ change if air friction is ignored?

  As a freely falling object speeds up, what is 7oh 5q-mj g9u 2twagnar96k x8*q *gyzhappening to its acceleration, how does it change if air frictio9n 9ozgmy72 jgqr-u8 atk6ahw*gqx 5*n CAN NOT be ignored?

  An object that is thrown vertically upward will retuii 9kdvxt)(j4 rn to its original position with the same speed v)kx ij4d(9 tias 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 at the sat7b)hfemp d i5o; ;hu1me time.

  An object can have nonzero velocituip lkf6u79cc*r n/.h4yp9 wvn:of ;by and zero acceleration at the same time.

  An elevator moving from the second floor to then 3shw /j;8g:gog*6sihmgy o nw,to2. fifth floor making no stops along the way hah:osn ,.*n;g o2gyt/ji 6 so83whw ggms zero acceleration all the time.

  A rolling ball moves from wdfpqmjq3ddg8 1 e. -;$x_1=2.0 \mathrm{~cm}$ to $x_2=-4.6 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. 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 $x_1=2.6 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qua6x9z :i-i kjyzrter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.6 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, moving 94 m away in 9.jf 5inv;q;o/f 3 s. It then tjff /;5;vnoi qurns 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 from zc)c f4 hnmvgit+,1yjw; sc.-$11 \; m/s$ to $23 \; m/s$ 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 frodgh7i 8dwdtjhat 6b29tq tz md4 )m-9afsm -;:m $15 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sp((4;lolcps neeed of $25 \; m/s$ 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 blocks to essentially top spescd)xrb sdv3(8l 7t.ked about v )rbs83(t kcd. s7xdl$10.5 \; m/s$ in the first 11.0 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speed of13j:w /ur;cbwgvcdy7+-m98auaz x(wulam* x $16 \; m/s$ to rest in 4.47 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mard -oz j8hnuut .(y7p5yks 92 m long on the highway. Assuming .-nyz uo(pth 75yj8uda deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g;*ps s j rfjp6)jh,7zhoing $25 \; m/s$ 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 than 30.0 min. After exactldj.- ;v -1 6flddn+vqric0fgn vhx/h9 y 27.0 min, there are still 1100 m to go. The runner must thennidfrdd +1qj-fvx.vg9h 0 v/h; n-lc6 accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$