The gravitational potential energy of a ...

The gravitational potential energy of a body at a distance `r` from the centre of the Earth is `U` where `r gt R` (radius of Earth). What is the weight of body at the point ?

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`U = (GMm)/(r ) = ((GM)/(r^(2))) r m = g r m = (mg) r`
`:. ` Weight of body `= mg = U//r`

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