RunGopherRun
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Here's what I came up with. I converted down from an 11.00 100m guy, broke it down into acceleration phase and top end speed phase, and went from there. From what I have learned, it takes 25 - 30 meters for 100m guys to get up to top speed. I figured 20m due to the shortness of the sprint and the urgency to get up to top speed. From what I have seen in my years of coaching and running track, an 11 flat 100m guy can run right around 10 m/s top end speed. So if it takes 3 seconds to accelerate for 20m up to top speed and then average 10 m/s the rest of the way, (8 seconds for 80 meters) you get 11 flat. Obviously this is just an estimate and everyone is different, but let's just go with it. Using those speeds and distances, it would take 3 seconds to go 21.87 yards (20m), the remaining 18.13 yards would be covered at 10.94 yd/sec (10 m/s) for an additional 1.66 seconds making the total 40 a 4.66.
Obviously this is an estimate, and maybe some of my assumptions are off, but I doubt that all of those recruits run 10.60 to 10.80 in the 100m to convert to a 4.4 to 4.5 40.
Obviously this is an estimate, and maybe some of my assumptions are off, but I doubt that all of those recruits run 10.60 to 10.80 in the 100m to convert to a 4.4 to 4.5 40.