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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 :-2J40J10J20J

A
10J
B
2J
C
20J
D
40J
Solution
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#### The correct option is A2JThe 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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