Me is the mass of earth and Mm is the ma...

`M_e` is the mass of earth and `M_m` is the mass of moon (`M_e=81 M_m`). The potential energy of an object of mass m is a distance R from the Centre of earth and r from the centre of moon, will be

`-GmM_m (R/81 +r) 1/R^2`

`-GmM_e (81/r + 1/R)`

`-GmM_m (81/R + 1/r)`

`-GmM_e (81/R -1/r)\`

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