Question

A brick stone of mass $5\text{kg}$ is at a height above the ground. If the potential energy of the stone is $100\text{J}$. Find the height of the stone with respect to the ground.
(Take $g=10{\text{m s}}^{-2}$)

• A. $2\text{m}$
• B. $4\text{m}$
• C. $0.2\text{m}$
• D. $0.4\text{m}$

Answer 1

The correct option is A $2\text{m}$

Given,
Mass of the stone, $m=5\text{kg}$
Potential energy $=100\text{J}$
Acceleration due to gravity, $g=10{\text{m s}}^{-2}$
Height, $h=?$

We know,
Potential energy $=mgh$
$100=5\times 10\times h$
$100=50\times h$

$\therefore \text{h}=\frac{100}{50}=2\text{m}$
Height of the brick stone from the ground is $2\text{m}$.