How fast would Usain Bolt's 40-yard Dash time be?

Question

With his new world record time, how would that convert to a 40 yard dash?

Answer 1

4.35 seconds.

 

Sounds crazy? Chris Johnson ran it in 4.24 but he isn't faster over 100m. The thing here guys is that the 100m and the 40 yard dash are very different races. The 100m is about getting to top speed as quickly as possible and holding it to the end. Top sprinters (including bolt) don't get to top speed until about 60 metres into the race (about 65 yards). And so, while Usain is incredibly fast over 100m, if you put him in the 40 yard dash he wouldn't have the explosion to get to the sub 4.2s never mind sub 4 seconds. 

Football players however train to accelerate very fast. Add this to the fact that in the combine, the guy with the stopwatch starts it when the plaer first moves off the line. Allow a 0.1 - 0.2 second delay in starting the watch which helps players to seem faster.