According to IAAF Analysis Split Times, Usain Bolt ran his first 40m in 4.65 seconds. Subtracting his reaction time which was .165 seconds, he ran the 40m in 4.485 seconds. 40 yards is equal to approximately 36.576m
By simple ratio:
(40m/4.485)=(36.576m/X)
X=( 36.576 / (40/4.485) )
Usain Bolt's 40 yard dash would be: 4.100 seconds

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Posted by C

Houston

Member since Dec 2007

27832 posts

Posted on 8/4/12 at 11:29 pm to SaintCajun

quote:
(40m/4.485)=(36.576m/X)

That equation assumes uniform speed throughout. The better measure would be to take his 20m split and add that to ratio like you have shown. Still not perfect but much better. My guess is he was in the upper 4.18 range.

ETA: frick it. I ran the numbers:

Using the chart on page 3
40 yard = 36.576 meters = 30 meters + 6.576 meters
6.576 m = 7.19 yds

40 yard time = 30 meter time + 7.19 yard time
30 meter time = (0 to 30 m splits - reaction time) = 3.615s
7.19 yard time = average of 30 m and 40 m time divided by 10.94 yds multiplied by 7.19 yds = (.89s/10.94)x7.19 = .585s
3.615s + .585s = 4.200

someone can check my math and my assumption if they want

This post was edited on 8/4/12 at 11:53 pm

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Posted by bobbyray21

Member since Sep 2009

9490 posts

Posted on 8/5/12 at 8:42 pm to SaintCajun

quote:
According to IAAF Analysis Split Times, Usain Bolt ran his first 40m in 4.65 seconds. Subtracting his reaction time which was .165 seconds, he ran the 40m in 4.485 seconds. 40 yards is equal to approximately 36.576m
By simple ratio:
(40m/4.485)=(36.576m/X)
X=( 36.576 / (40/4.485) )
Usain Bolt's 40 yard dash would be: 4.100 seconds

You can't do it that way. His speed wasn't constant. It was still increasing when he hit the 36.5 meter mark.

Everyone please disregard this guy's analysis. It is garbage.

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