1.

The gravitational potential energy of a body at a distance `r` from the centre of earth is `U`. Its weight at a distance `2r` from the centre of earth isA. `(U)/(r)`B. `(U)/(2r)`C. `(U)/(4r)`D. `(U)/(sqrt2r)`

Answer» Correct Answer - C
`U = (-GMm)/(R)`
`:. (-GM) = (Ur)/(m)`
`E = - (GM)/((2r)^(2)) = ((Ur//m))/(4r^(2)) = (U)/(4mr)`
`F = mE = (U)/(4r)`


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