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Question

Gravitational potential difference between surface of a planet and a point situated at a height of $20 m$ above its surface is $2 j o u l e / k g$ . If gravitational field is uniform, then the work done in taking a $5 k g$ body of height $4$ meter above surface will be :-

A

$2 J$

B

$20 J$

C

$40 J$

D

$10 J$

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Updated on : 2022-09-05

Solution

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Correct option is A)

The potential difference for a distance of $20 m$ is $2 j o u l e / k g$ .
Now work done $= m \times$ potential difference.

Thus work done for a distance of $4 m$ for a mass $5 k g$ , $W = \frac{4}{2 0} \times 2 \times 5$
$⟹ W = 2 J$

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