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Question

Gravitational potential difference between a point on the surface of a planet and point 10m above is 4J/kg considering the gravitational field to be uniform,how much work is done in moving a mass of 2kg from the surface to a point 5m above the surface ?

A
40J
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B
45J
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C
6J
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D
73J
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Solution

The correct option is B 45J
v2v1=4Jkg
x2x1=10m
potential gradient =v2v1x2x1
How is because it is given the gravitational field is uniform
ΔhΔx=410
for 5m workdone =mt(ΔvΔx×(5))
=2×45×5
=45

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