[Bob Seger]

I went back and recalculated his average time in the 100, and it is 11.7 seconds not 11.6 ( 0.1 second is an eternity in running). I was surprised by that time, I was expecting it to be faster. That comes out to about a 4.68 forty time. He looked faster than that on the football field. Not trying to put the kid down (was impressed with his football talent, more on D than on O), just surprised by his times.

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.