A stone is dropped from a platform above the ground

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

Problem

A stone is dropped from a platform

45\,\text{m}

above the ground. Taking

g=10\,\text{m/s}^2

, calculate the time it takes to reach the ground. (a)

2.1\,\text{s}

(b)

3\,\text{s}

(c)

4.5\,\text{s}

(d)

9\,\text{s}