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Standard X

Physics

Potential Energy of an Object at a Height

Gravitational...

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 :-

2 J

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20 J

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40 J

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10 J

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Solution

The correct option is A $2 J$
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 $5 k g$ , $W = \frac{4}{20} \times 2 \times 5$
$⟹ W = 2 J$

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

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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 :-

The correct option is A $2 J$
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 $5 k g$ , $W = \frac{4}{20} \times 2 \times 5$
$⟹ W = 2 J$