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Question

The gravitational potential difference between the surface of planet and a point 20 m above its surface is 2Jkgāˆ’1 If the gravitational field over this range is uniform, then the work done to raise the body of 5 kg from the surface to a height of 4 m is:

A
1 J
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B
2 J
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C
4 J
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D
8 J
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Solution

The correct option is B 2 J
Here,
m=5kg
V=2J/Kg
h2h1=20m
V=g(h2h1)=2
g(20)=2
g=0.1ms2
Now work done in rising a mass of 5 kg by 4 m will be
W=Mgh
W=0.1×5×4
W=2J
Work done will be 2 Joule.

1170289_1393698_ans_b6b9057aa1404f9889f8b01699a94cf4.PNG

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