Answer :

The Earth-moon systems are bound systems, so the total energy has to be negative. The total energy of the system(E) is the sum of the kinetic(K.E.) and potential energy(P.E.) of the system. We know that the K.E. can never be negative. Hence, P.E. has to negative and it magnitude should be greater than the K.E.

Therefore, P.E. >K.E.

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