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That may not be an accurate way of determining a 40 time. I had a son that ran a 6.72 in the 60. He had a very slow first 10 yards, but the last 50 he could fly. If he ran the first ten yards as quickly as the last 50 it was estimated that he could have gotten his time somewhere down in the 6.5 to 6.6 range.The people that trained him in the off season really got technical and scientific working on the first 10 yards, and even though some improvement was made, he still always struggled somewhat with the first 10 yards and the 6.72 was always the best he could do. All depends on how quicky you get out of the block and at what point your acceleration really kicks in. It may be early or it could be at a latter stage of whatever designated distance of the sprint. It could work the opposite for Jude , perhaps he gets out quickly for a 40, but does not have another gear when it comes to the 100. I have no idea, I'm just pointing out that your formula may not be relevant in his case.

I never said it was a perfect way to judge his 40, just an estimate from his actual 100 times he ran this year. I agree that he probably has a faster first 40 than the last 60 in a 100. Once agian I am a fan of the kid, just surprised at his slow 100 time. I was not putting him down on offense, I just thought he looked very good on defense in the games I saw. The kid was putting some hits on people.