Physics

Problem

A stone is dropped from rest from the top of a

45\,\text{m}

high cliff. Taking

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

, what is its speed just before it hits the ground? a)

21\,\text{m\,s}^{-1}

35\,\text{m\,s}^{-1}

30\,\text{m\,s}^{-1}

28\,\text{m\,s}^{-1}