We think we know a lot about Usain Bolt. Science tells us he can run at 27mph, unleash 2,619.5 watts of power and produce 81.58 kilojoules of kinetic energy in a 100m sprint – that’s 50 times more than a bullet leaving a Magnum handgun.
http://www.shortlist.com/entertainment/sport/usain-bolt-busts-the-myths