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# The mass of the earth is 6.00 Kg and that of the moon is 7.40 kg. The constant of gravitation G=6.667Nm^{-2} kg^{--2}.The potential energy of the system is -7.79 Joules. the mean distance between the earth and moon is =

- 3.80
- 3.37
- 7.60
- 1.90

## The correct answer is: 3.80

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