What is the height of the table so that when a mass of $2 k g$ is placed on top of it its potential energy is $9.8 J$ ? (Take $g = 9.8 m s^{- 2}$ )

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Solution

Potential energy of the object of mass $2 k g$ is given as $9.8 J$ on the table.
so $m g h = 9.8 J$
$2 \times 9.8 \times h = 9.8$
$h = \frac{9.8}{2 \times 9.8}$
$h = 1 / 2$
$h = 0.5 m = 50 c m$

The height of the table should be $50 c m$ so that the potential energy of the object is $9.8 J$ .

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