A gymnast lands vertically from rest after dropping onto a foam pad

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

50\,\text{kg}

gymnast lands vertically from rest after dropping

2.0\,\text{m}

onto a foam pad. To limit the magnitude of the average force exerted on her body to

1.5\times10^{4}\,\text{N}

, what minimum pad thickness (assume uniform deceleration within the pad) is required? (Take

g=9.8\,\text{m s}^{-2}

.) (a) about

13.5\,\text{cm}

(b) about

6.5\,\text{cm}

3.4\,\text{cm}

(d) about

65\,\text{cm}