A woman jumps off a high wall onto hard ground

PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

60\,\text{kg}

woman jumps off a

3\,\text{m}

high wall onto hard ground. Take

g=10\,\text{N kg}^{-1}

. (1) Calculate the impulse felt by the woman as she lands on the ground. (2) When the woman lands, her body moves a distance of

1.5\,\text{cm}

. Calculate the average force exerted on the woman's feet and legs by the hard ground. (3) If the woman had bent her legs whilst landing, her body would have moved a distance of

50\,\text{cm}

. Compare the force she would have experienced whilst bending her legs to the force calculated in part (b). (4) Comment on why it is sensible to bend one's legs when landing on the ground from a jump.

Related theory

Impulse-Momentum Theorem
Impulse
Kinetic Energy
Work Energy and Power
Kinetic energy and the work-energy theorem
Work and kinetic energy: Work–energy theorem

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