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Originally Posted by mtecnic
Unless my math is off, a 5 sec 40 is 16.5 miles per hour average over the span. This just doesn't seem that unreasonable to me.
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The fastest human footspeed on record is 44.7 km/h (12.4 m/s or 27.78 mph), seen during a 100 meters sprint (average speed between the 60th and the 80th meter) by Usain Bolt.[4]
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Problem you have to average it, starting from 0 and the whole 40 yards the best still haven't gotten to top speed.