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Two planets have masses M and 16 M and t...

Two planets have masses M and 16 M and their radii are a and 2a, respectively. The separation between the centres of the planets is 10a. A body of mass m is fired trom the surface of the larger planet towards the samller planet along the line joining their centres. For the body to be able to reach at the surface of smaller planet, the minimum firing speed needed is :

A

S

B

`4sqrt((GM)/a)`

C

`sqrt((GM^2)/(ma))`

D

`3/2 sqrt((5GM)/a)`

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