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The masses and radii of the earth and moon are 1 1 , R M and 2 2 , R M respectively. Their centres are 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

1. ) ( 2 2 1 M M d G 
2. ) ( 2 2 2 1 M M d G 
3. ) ( 2 2 1 M M d Gm 
4. ) ( ) ( 2 2 1 2 1 R R d M M Gm  

Correct answer: ) ( 2 2 1 M M d G 

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