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Question

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 :-
  1. 2J
  2. 40J
  3. 10J
  4. 20J

A
10J
B
2J
C
20J
D
40J
Solution
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The correct option is A 2J
The potential difference for a distance of 20m is 2 joule/kg.
Now work done =m× potential difference.
Thus work done for a distance of 4m for a mass 5kg, W=420×2×5
W=2J

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