How much power does Usain Bolt expend as he accelerates in the 100-m dash?

Wind affects sprinting records. How much power does Usain Bolt exert overcoming air resistance? How does this compare with the power he exerts overcoming “friction” (i.e., due to the inefficiency of running)?

Look for the answers online at Question suggestions are always welcome! For more Fermi questions and answers, see the now available Guesstimation 2.0: Solving Today’s Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).

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