Question

A stone is dropped from a cliff 125m high, how long does it take to fall?

Answer 1

Answer:

The stone takes 5s to reach the ground.

Explanation:

It's given that stone is dropped from a height of 125m

therefore, the stone will cover 125m while falling.

so,

s = 125m

u(initial velocity) = 0

a(acceleration due to gravity) = 10m/s²

using, s = ut + 1/2*at²

we can find out time taken

substituting the values

$125 = (0)t + \frac{1}{2} (10) {t}^{2} \\ 125 = \frac{10}{2} {t}^{2} \\ 125 = 5 {t}^{2} \\ \frac{125}{5} = {t}^{2} \\ t = \sqrt{25} \\ t = 5s$

Thus, the stone takes 5s to reach the ground.