Anyone know Usain Bolt's 40 time ?
Usain bolt's fastest time in the 100 meters is 9.58 seconds.....now he might be able to run a faster 40 but I don't have that data on hand so let's do some math
100 m/9.58 seconds = 10.438413 meters per second
we can cover that to yards by 1 yard/0.9144 meters
so that's 11.4155877 yards per second
set that equal to (40 yards/X) and you get = 3.50398 seconds......so a 3.51, oh yea and Bolt general gets up to top speed later in the 100 meters, so yea there is that to consider