Suppose that an object tr ne zbqil(/7nyg; sd g5wu65/qavels from one point in space to another. Make a comparison between the displacement and the distance traqn(/655 iq zywl/gsnugbed; 7veled.

  When is the average velocity of an object equal to t3gr9 sap(ma g xly)wy )i+y;/nhe instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to six.( nerhd b,dj*krz9b* ty in 8. khb*9(,nr z jbder*d s". This is a description of

  An object moving in the +u*3wxgydxna4*q4m)la- e rl +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Eayf1v/6 e r9 *ahvgpq:vst (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning v6v 1:rg* 9vpa/qheyfits acceleration.

  Suppose that a car traveling to the West yhi lo+26on -:mg9ddr(-x direction) begins to slow down as it approaches a traffic light. Make a statement concerniiom -6d+d gny:9rlh2o ng its acceleration.

  Suppose that an object is moving w)o8f timro g*5ith a constant velocity. Make a statement concerning i*itmo)8 5gf rots acceleration.

  If the velocity of an object is zero, does it mean that the acced bwoi)tlq jz,l4 c5-5g c);jwleration is zerob l-wdc ci5oj,jqg)l4 5tw z;)? Support your answer with an example.

  Can an object's velocity change direction when its accelerj g6op qrg)m9;ation is constant? Support your answer with an;qjo9 gpr) 6mg example.

  Suppose that an object is moving with constant acceleration. Make a statement z3gon8(h)zt/kdok n r-+ 4pai concerning its motion with respec 3d/( z4 aot8npnoizhk)gk+r-t to time.

  Can an object have increasing speed wr 7-d:fwbblkr 42rj4c hile its acceleration is decreasing? Supportl:rrrcf4wk 4-j7db b2 your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hilfri y: fy13ex+l of ice. Make a statement concerning its acceleration3:x efri+yfy1.

  Under what condition is average vevv2 3dk6s qb/clocity equal to the average of the object's initial an3 kbqv 26cvds/d final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Howahev6p5fg 4 u ,- w(oe*(xekvaever, object A accelerates for twice the time as object B. What is the final speed of object A comax-,* a f(5 gkho6ew4pe( vevupared to that of object B?

  Objects A and B both start from rest. They both accelerate at the :( vd:ljd(fq2o.3aszl r.pg x same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared tls2a.(:q.vxrlf( :j d go3zp do that of object B?

  When an object is released from rest and falls iyi ohgbdno 2+ 36,nkn0n the absence of friction, which of the following is true concerning in36doiho ybk2nn+ , 0gts motion?

  When an object is released from rest and falls in the absence of.d d(l h tz.azqh3a;n5 friction, which of the following is true ch.; h d5dzan(t.3qzaloncerning its motion?

  Suppose a ball is thrown straight up. Mlt8 umkfq/2o6 ake a statement about the velocity and the acceler/fu olk2tqm 68ation when the ball reaches the highest point.

  Suppose a ball is thrown stry k91e8g lw *hd5o:eewaight up. What is its acceleration just before it reaches its higheslw :we89yo5 ke1hge d*t point?

  Suppose a ball is thrown stre jhlk)0x::w kn.m;e eaight up, reaches a maximum height, then falls to its initial height. :kx w k.);0ehj:m nleeMake a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxio, 6/d:xcwv/ n bdk.i-g7ampnmum height, then falls to its initial x o.: nvi adbwm7p -k/cgd6n/,height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward inv)h,3fbgx5 n d the absence of air resistance. Make a statement concerning its accelerb ,g5xf dvn3h)ation.

  Suppose a skydiver jumps from a high-flying pj6 5ulht7xt *hjx)a )qlane. What is her acceleration when she she reaches terq l6*57xuxtjj th) a)hminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bag6mnf 6wx8jo2ll is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that o8 6jn xwg2m6fof 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 B isd;hg ajj44si ( dropped frogad ;h44j( jism the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second l vgpjsn*ibj3(4tne8ni y/er( 1c. z,qater, ball B is dropped from the same building. As time progresses, the difference i.3 e c,vgbtsi/ inn 8np( 4rj(1yjz*eqn their speeds

  Two objects are thrown from the top of a tall building. One n/btu+d k pu q5sltm6/s1/6tdis thrown up, and the other is thrown down, both with the same initial speed. What are theirb d qu1s+tukl/psm/t6n/56t d speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thro k8lp-keyty46b*3 wbm vpy*8qwn straight down from the sam3*6-4k yweykp*py lbtq8b8vm e 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. The poh-rgs vn 8swh1nh*7n 38s va)dsition veranv g1-3*8s shwnv8dhs)r h 7nsus time graph of this object is

  An object is moving with constant non-zero acceleration in thsbj, 3bwws;f8a6w+aa e +x axis. The position versus ti 6s,3a+sfb awbjaw8;w me graph of this object is

  An object is moving with const4dk+dvpgn9y 9 ant non-zero velocity in the +x axis. The velocity versus time gyn9gd4 p+kv d9raph of this object is

  An object is moving with constant non-zero acceleration in the +x axis m2 lu jxm8h1-:/(unr)*cruc0naqzen . The velocity versus time graph of this obj-:r/(z0 a81mnrnlxq)neu mcj *2c uuhect is

  The slope of a positio d1,p kwrl6sg s9oik5/n versus time graph gives

  The slope of a velocity versus tib1;o (xp 5 0rbyzs1latme graph gives

  The area under a curve in an accelerat,3; hj+wmen (qgjvu .qion versus time graph gives

  The area under a curve in a velocity versus time gra9z(u7wvnr8v c ph gives

  If the position versus time ga mk-75rm j jlmrb1(3iraph of an object is a horizontal line, the object isj3jmi-a(1r7mm5b rkl

  If the position versus time graph of an object is a ve*7c8 wss5o hsfrtical line, the object is*wsh57 8o fssc

  If the velocity versus time graph of an object is a horizontal linp,avnoc15v)cd. 0 b4niu ndit3k 4c-ce, the object i5a3d -iboc4ivnuc kv c0pt4),n.n1dcs

  If the velocity versus time graph of an object is a straight uc;m(o 2bes(xline making an angle of 30 degrees with the time axis, the object is(2mcx ;u eosb(

  An object moves 15.0 m north and then 11.0 m south. Find both the distuw9xxj* r l jbp6c49g0pvx1 t, e+9jrtance traveled and the magnitude of the disct0+wpj1ub 9x x t* jg9rr96 4,vlxpjeplacement vector.

  A boat can move at 30 km/h in still water. How long will it t7;/y svxya 5u3hb3wrrake to move 12 km upstream in a riv ys wvbr;/5 33xuayh7rer flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16091jj)/ tx5s2q 2jt76 a 7ymb lfh)egykv m)

  What must be your average speed in o43ssql j,ago8v 4 loc*rder to travel 350 km in 5.15 h?

  A runner ran the mara (cf thkd+no/a -+/newthon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of a/ dw(o- t++efc/ hnknthe runner in m/s?

  A car travels 90 km/h. How long does it take forx* cd:,hbc(uo it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. Thekc w+wk5r )7vh speed of lighkc+vk7w r)hw5 t 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 sior07 ;tjr8 olwde for 4.0 s, how far do you travel during thlw7 ot80;rjor is inattentive period?

  If you run a complete fa/)k0 uiso,cjbb1,i erh ,: vloop around an outdoor track (400 m), in 100 s, your average velocity is ke:), soah,, vcbbr1ifi0/uj

  A polar bear starts at the North Pole. zz m3 k:3ipy,zIt 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. Thisi3z ,m:3z kyzp 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 ;)h /p)-1o5mtdn0 umahr dgsmkm east, then 1.0 k0;h dmm d1n )-otr)5pgshm/ aum north, 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 arok.+6li 7q dit 55 mi/h for 110 miles. It then starts to snow a6kil qr+d.7 iond you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 t)89mh 2qil(cveoq , rkm at 80 km/h and 160 km at 100 km/h. What is the average speed ofol8it 2(remq9 c), qvh the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. y4 ;)ibbwudmks5 ;wy68ndfpta22p,k What is her average speed for thei mfy;u6wb pp8n)24k d25y;,sb dwak t trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at , x) xbxpxb.jwb * bit0g7-;fvs-0qcw250 mi/h north for 750 miles. What is the j;pgbcxt, 0 bwbqx- w)b07*x vsi-.xfaverage speed for the trip?

  In a 400-m relay race the anchorman (the person w,-dq0 jqo+ffgq6os l5ho runs the last 100 m) for team A can run 100 m in 9.8 s. g+o qsjqf5 l0dof-q6, His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 11 iaw7x 6u. hfmoz:s y3:fu3bh+q:gv5ys. The car's average velocity during deceleration was 66 km/h. What was 5:.y a7+u f3hgz hfbu wosm:6yxqvi3 :the car's deceleration while slowing down?

  An airplane increases its speeubblgj +1c;n,d from 100 m/s to 160 m/s, at the average rate of gj+;bnbcl 1 u,$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelefr.c- q8,ucy jrates 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 andkim g )-8mrwy9 accelerates 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 i2662 h7w erthi9wp5w* rpxdmat8 )fm for 10 s. It then speeds up with a constant acceleration of aw2pr6dtw9mxih6w25t rmp78h *ef ) i $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.0 m/s experiences a constangoj coa6m2/+ibbi 8q1 t acceleration of 2q/jo1c ib6 8+ogmabi$1.5 \; m/s^2$. What is the cart's displacement during the first 8.1 s of its motion?

  A bullet moving horizontally to the right (+-f l)v)h( t8z zo518vdyw*rh x-n k5htgb6yjwx direction) with a speed of 442 m/s strikes a sandbag and penetrates a distance of 15.94 cm. What is the average acf byo tv6vtdw)x(n hz -1 gh)8y-j8 rl5wk*h5zceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cath.6le/m .rda3t qb9uh zo 3fh5j6gv /bapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleratibb9 let5j/d6oh.a h33/uh 6fmqvzr. gon is constant, what is the length of the catapult?

  A car starting from rest moves with constant accelerg3xh e7vh)5c iation 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 200 m. What is it2 d)tj +bw-dkzs average ac)t d-w+db 2zkjceleration?

  An object starts from rest and undergoes uniform axhu:7c w )/ ywguy)t ) nnru9-u-pwd8mcceleration. During the first second it travels 1.0 m. How far will it travel c hrwp)uxmuwn-/y)-y g8: unwtud)7 9during the third second?

  An object is moving in a straight line witwvlc 4n1)+t5a(s l-5bgwekpvh constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveli1e bgn c55(4w+-lv)plakt vswng at 10 m/s. How far does it move during this time?

  A car starts from res) 6rpj,wmh5 gq6 jp)ht.o du;lt and 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 road can decelerate at abopfa(ga / vd2w-ut $5.0 \; m/s^2$ 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 woa/3 ij 6r rg-p9ts7doaiting at the intersection starts ahead with a constant acceleratio3atrdsj 7r9o- o/ g6ipn 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 plane-+yl fx5oc jfb--laxp 4(kp* qq2p,qct X where the ack ppb-lf4ycx l-x5cqo2*-qf p+j(aq ,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 wql6g,lm )fz .lrsd6, ehererlz q,sg6m . f6l)led, 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 su -5jadz )z/q7pitk )fwrface of planet X where the aca-kz t i)7 zpq/)j5wdfceleration 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*q0cn zjf-)83wlvi,jf pk 0at a speed of 14 m/s on the surface of planet X where the acceleration due n qflai8j0p* t k,zc-)03fvjwto 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 friend holdnth.nf h +kx+-y;:j hv11xc kfa+3lhts a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall befo:hcha+njf - 1f n+ythvxl3k+k hx.t;1 re you catch it?

  A ball is thrown upward at a velocity of 19my4:k 5wr xqq4w0s ms..6 m/s. What is its velocity after 3.km.x y4:0wqsw54mr q s00 s?

  A bullet shot straight u.t1ki9 wq5y6 i.dryryp returns to its starting point in 16 s. What is the initial sp .w69ryq1ki5y ityd .reed of the bullet?

  A ball is thrown straight up witx *+lgk(1+gibu2p(nrh6r r ehh a speed of 36.0 m/s. How long does it take to return to its star*hlh2 k+g x((rg n+ebpr1r u6iting point?

  A ball is thrown downward from the top of a building wi 67do*pk6e b5*zfki dath an initial speed of 15 m/s. I i566eaozdp*fk7dk*bt strikes the ground after 6.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerjng :(coicl :f) yr3:; 5fy(x-mlas wkical value r:mw:l-ficoj f(n al)( sy:c5 kgx;y3 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 speed-nfzue d9 ifbj2;lg,3qkg :1a 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 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 velocity at ttvw oh9z e5e 0jc51 *krwepu;* = 1.0 s?

  In Fig. below, what is the velocity at t pt+lnx76g- hokux2amvw: - v 3lktfl31e9 gx;= 2.5 s?

  In Fig. below, what is the velocity at tf-il)-t hllo8t :zx zi ;m6,5sit05wru/ lwpt = 4.0 s?

  In Fig. below, what is thgkypd7/ g 2j8im1vz2 .8h ;f ygmt::7ped mfjse velocity at t = 5.5 s?

  In Fig. below, what is the average velvy3 8ivy) kn*x6mrgr4 8jq)rwocity from 0 to 4.0 s?

  In Fig. below, what is.ih3 hmpkuv70 the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acce3 0booyxtc +cx- aq79ae)w(ia leration at 1.0 s?

  In Fig. below, what is+.jiv2 mgr /a* duxdg; djw*5c the acceleration at 3.0 s?

  In Fig. below, what is the average o-gnkiffmd 5es(xc6 bd 1 60+qacceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tov1 syu8*w6 rzq 8.0 s?

  In Fig. below, what is the displacement from 0 to m:dqha-l s )r78.0 s?

Does a car speedometer measureqgl1+h2:q o/2ib ptf a speed, velocity? {speed|velocity}

  An object can have a varying speed if iqm+pf;bmm9 c3ts velocity is constant.

  The velocity of an object can be negative when iwy)8gppcz *i -*+nxu04ymay c ts acceleration is positive.

  If one object has a greater speed tha: o*udg3 gr:aqn a second object, the first must have a greater accelerationa: d*go qr:3gu.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed ol:h(622p u-rajj5to0 u ugjfk f $60 \; km/h$ 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 spey,(kjl:uk u(yax*,f q*k)n yped as its acceleration decreases.

  A baseball player hits a foul bal ,kb k-0/zfqmd.lnltmt2x100y ;cml kl straight up into the air. It leaves the bat with a speed-z/m0lt lcf.kk0;t bydlnmm1,kx2 0q 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 acceleration, ;-)wgkgkuvpzj v8* a3how does it change if air friction is ignored z 3;8-)akwkj *vgguvp?

  As a freely falling object speeds up, what is happening to;oso2c.ts uiiks3 tzofs:::6 its acceleration, how does it change:s .io s6t;ioo:tsu k23zcs f: if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will rezpnloo 4j a m64t,wzz97 e15eeturn to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how wiljw7p,9e zl6zmo 4a 1o zte4n5el this result be altered?

  An object can have zero velocity and nonzero accelhe1z h86yl/e meration at the same time.

  An object can have nonzero veloig3ouju d;3d 6yn2 fs3city and zero acceleration at the same time.

  An elevator moving fromgf .x. fkcr1q6 the second floor to the fifth floor making no stops along the way has xgc6fr q1.fk.zero acceleration all the time.

  A rolling ball moves7.k8l 8k63.e b 6a wx 9bakafjzk2vtic from $x_1=3.2 \mathrm{~cm}$ to $x_2=-8.3 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a jetzf 973)9zao g s um-xzl+z2quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its traks a-,) r0vo.pdwytuf3hl5 4 yiner in a straight line, moving 89 m away in 11.5 s. It then turns abruptly anpl-yho t403 sr w5,d yk.aufv)d 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 frr0*l *mns f*mrom $10 \; m/s$ to $24 \; m/s$ 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 from ,rkd 2qc 5ssj.$20 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of 4o3g;dno5-*mq k vz rn$27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to esur( fvs6ga+ f,so6k yw4.3onhsentially top speed aboua nfo fhuv srsgw3o+(y6k.64,t $10.5 \; m/s$ in the first 11.7 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 unir6 ++d pafuqlw( v;)g lk+gte+formly from a speed of $16 \; m/s$ to rest in 5.07 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a4b.k m:omu zdt94v t:n car leaves skid marks 92 m long on the highway. Assuming a de:tkzb t4:dn 9.mmo4 uvceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trvku1bt8u9+ 6eo5d mh zuck going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in leb9hfotn *w: d/ss than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The rufw9/* hn:obt dnner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$