Question: A hiker stands on the edge of a cliff 490 m above the ground and throw a stone horizontally with a s...

Question

A hiker stands on the edge of a cliff 490 m above the ground and throw a stone horizontally with a speed of 15 m s^-1. The time taken by the stone to reach the ground is

Answer 1

Solution

Here, $u = 15ms^{- 1},h = 490m$

Time taken by the atone to reach the ground is

$t = \sqrt{\frac{2h}{g}} = \sqrt{\frac{2 \times 490m}{9.8ms^{- 1}}} = 10s$