1.

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?

Answer»

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

Solution :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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