A body of mass $5 k g$ falls from a height of $10 m$ to $4 m$ . Calculate the loss in potential energy of the body. (Take $g = 10 m s^{- 2}$ ).

0 J

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300000 J

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3 J

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300 J

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Solution

The correct option is D $300 J$
$P . E = m \times g \times h$
In first case h is 10 m
$P . E (1 s t) = 5 \times 10 \times 10 = 500 J$
In second case h is 4 m;
$P . E (2 n d) = 5 \times 4 \times 10 = 200 J$
Hence difference that is loss of potential energy is $500 - 200 = 300 J$ .

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