A

$75$

$-$kg sprinter accelerates from rest to a speed of

$11\mathrm{.}0$

m$/$s in

$5\mathrm{.}0$

s$.$

Calculate the mechanical work done by the sprinter during this time.

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Calculate the average power the sprinter must generate.

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If the sprinter converts food energy to mechanical energy with an efficiency of

$25$

$\%$

$,$ at what average rate is he burning Calories?

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What happens to the other

$75$

$\%$

of the food energy being used?

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