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Q.

A body is falling under gravity. When it loses a gravitational potential energy by U, its speed is ν.The mass of the body will be

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a

2Uν

b

U2ν

c

2Uν2

d

U2ν2

answer is C.

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Detailed Solution

Applying conservation of mechanical energy, we have 

12mv2=U or m=2Uv2

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