A stone is dropped from rest from the top of a cliff high

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A stone is dropped from rest from the top of a cliff

20\,\text{m}

high. What will be its speed when it is

10\,\text{m}

above the ground? (Take

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

) (a)

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

(b)

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

(c)

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

(d)

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