Physics

Problem

2\,\text{kg}

stone is released from rest at the top of a

40\,\text{m}

high cliff. Neglecting air resistance, at what height above the ground is its kinetic energy three times its potential energy? (Take

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

.) a)

20\,\text{m}

10\,\text{m}

30\,\text{m}

13\,\text{m}