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The gravitational potential energy of a ...

The gravitational potential energy of a body of mass m at a distance r from the centre of the earth is U. What is the weight of the body at this distance?

A

`-U`

B

`-Ur`

C

`(-U)/(r )`

D

`(-U)/(2r)`.

Text Solution

Verified by Experts

The correct Answer is:
C
Potential energy `U=(-GMm)/(r )=(-GM)/(r^(2))mr`
`U=-gmr rArr mg=(-U)/(r )`
So the correct choice is (c ).
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