The maximum energy a bone can absorb without breaking is surprisingly small. For

Question

The maximum energy a bone can absorb without breaking is surprisingly small. For a healthy human of mass 60 kg, experimental data show that the leg bones can absorb about 200 J. (a) From what maximum height could a person jump and land rigidly upright on both feet without breaking his legs? Assume that all energy is absorbed in the leg bones in a rigid landing. 0.68 m (b) People jump from much greater heights than this; explain how this is possible. HINT Think about how people land when they jump from greater heights.

Explanation / Answer

m = 60 kg, E = 200 J

E = m g h

h = (200 ) / (60 * 9.81)

h = 0.34 m

So people can jump from 0.34 m height and land rigid on fet without breaking legs

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