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The mass of the earth is  6.00 × 10^24 kg  and that of the moon is 7.40 × 10^22 kg  . The constant of gravitation G=6.67 × 10^-11 N-M^2/kg^2. The potential energy of the system is -7.79 × 10^28 joules  . The mean distance between the earth and moon is

(a)     3.80×108 metres                     (b) 3.37 ×106 metres

(c)   7.60×104  metres                   (d)   1.90×102 metres

Answer: a

(42)

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