The masses and radii of the earth and moon are M1 , R1 and M2, R2 respectively. Their centres are at distance d apart. The minimum velocity with which a particle of mass m should be projected from a point midway between their centres so that it escapes to infinity is:
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Correct option is C)
The sum total of kinetic energy and potential energy of system must be conserved. For minimum velocity, this must be 0 at infinity.