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The masses and radii of the Earth and th...

The masses and radii of the Earth and the Moon are `M_1, R_1 and M_2,R_2` respectively. Their centres are at a distance d apart. The minimum speed with which a particel of mass m should be projected from a point midway between the two centres so as to escape to infinity is ........

A

`sqrt((G(M_(1) + M_(2)))/(d))`

B

`sqrt((2G(M_(1) + M_(2)))/(d))`

C

`sqrt((4G(M_(1) + M_(2)))/(d))`

D

`sqrt((GM_(1)M_(2))/(d))`

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