Posted by JohnX on Monday, September 24, 2007 at 7:05pm.
Olympic champion Justin gaitlin set a new world record for 100.0 m sprint at the last lympics by clocking 9.86 s for the race.Calculate
a)His average speed for the race
b)Assuming that he accelerated uniformly for the first 4.86 s after taking off the blocks to reach a maximum speed Vmax with which he continues for the rest of the race, is this speed likely to be same as, less than, or greater than the average speed.Why?
c)calculate the max. speed he reaches at the end of the first stage of his motion
d)Calculate the distance covered during the two stages and the steady acceleration in the first stage.

physics  drwls, Monday, September 24, 2007 at 8:11pm
Surely you can do (a) yourself.
For (b), consider if the average speed could ever exceed the maximum speed, and in what situation they could be the same.
For (c), the average speed during acceleration is Vmax/2 and the total distance travelled is
(Vmax/2)*4.86 s + Vmax*5.00 s. Set this equal to 100 m and solve for Vmax
I will be happy to critique your work on (d)
Answer This Question
Related Questions
 physics  Olympic champion Justin gaitlin set a new world record for 100.0 m ...
 Physics  usain bolt set the world record for the 100m dash, proving to be the ...
 Physics  The Yukon Quest, an annual dogsled race between Whitehorse in the ...
 physics  (a) In 2009, Usain Bolt ran the last 100 meters of the 150meter race ...
 physics  (a) In 2009, Usain Bolt ran the last 100 meters of the 150meter race ...
 math  What would be the answer to85x205=960x3256 85 x 205 = 17425 960 x 3256 = ...
 Physics  The best sprinters can run a 100 m in 10.0 s. A 77.2 kg sprinter ...
 physics  (a)The world record for the 100meter dash is 9.58 seconds (Bolt, 2009...
 Physics Again  In 1954 the English runner Roger Bannister broke the four minute...
 Physics  If 100 m sprinters accelerate from rest for 3.5 s at 2.8 m/s^2, how ...
More Related Questions