The gravitational potential difference between the surface of a planet and a point 20m above the surface is 2Joule/Kg. If the gravitational field is uniform then the work done in carrying a 5Kg body to a height of 4m above the surface is
A
2Joule
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B
20Joule
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C
40Joule
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D
10Joule
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Solution
The correct option is C2Joule since it is given that gravitational field is uniform gradient of potential=Potentialdiff.Dist.betweenpoints=220=0.1J/Kgs Total work done =mass×distance×pot.gradient=5×4×0.1=2Joule