A stone of mass $5 k g$ is lying at the edge of a cliff of $80 m$ vertical height from the ground level. Calculate the potential energy of the stone.
[ Take $g = 9.8 m s^{- 2}$ ]

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Solution

Step 1: Given data
Height, $h = 80 m$
Mass of water, $m = 5 k g$
Acceleration due to gravity, $g = 9.8 m s^{- 2}$
Mathematical expression for potential energy:
$P o t e n t i a l E n e r g y = m a s s \times a c c e l e r a t i o n d u e t o g r a v i t y \times h e i g h t ∴ P . E . = m \times g \times h$
Step 2: By putting the values in the above expression, we get
$P . E . = 5 k g \times 9.8 m s^{- 2} \times 80 m = 3920 J$
Hence, potential energy of the stone is $3920 J$ .

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