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Since that very memorable day at the Beijing 2008 Olympics, a big question onevery sports commentator's mind has been "What would the 100 meter dash worldrecord have been, had Usain Bolt not celebrated at the end of his race?" GlenMills, Bolt's coach suggested at a recent press conference that the time couldhave been 9.52 seconds or better. We revisit this question by measuring Bolt'sposition as a function of time using footage of the run, and then extrapolateinto the last two seconds based on two different assumptions. First, weconservatively assume that Bolt could have maintained Richard Thompson's, therunner-up, acceleration during the end of the race. Second, based on the racedevelopment prior to the celebration, we assume that he could also have kept anacceleration of 0.5 m/s^2 higher than Thompson. In these two cases, we findthat the new world record would have been 9.61 +/- 0.04 and 9.55 +/- 0.04seconds, respectively, where the uncertainties denote 95% statistical errors.

Velocity dispersions in a cluster of stars: How fast could Usain Bolt have run?