- #1
harujina
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Homework Statement
In a race, a 54 kg athlete runs from rest to a speed of 11m/s on a flat surface. The athlete's body has an efficiency of 85% during the run. How much input energy did the athlete provide?
Homework Equations
efficiency = E out/E in x 100%
The Attempt at a Solution
I know E in = E out/efficiency
and efficiency = 85%, m = 54 kg, vi = 0, vf = 11 m/s
but how can I find E out?
Eg = mgh ?
There's no height though...?