Q .     Two spherical bodies of mass `M` and `5 M` and radii `R` and `2 R` are released in free space with initial separation between their centres equal to `12 R`. If they attract each other due to gravitational force only, then the distance covered by the smaller body before collision is

AIPMT 2015
A

`7.5 R`

B

`1.5 R`

C

`2.5 R`

D

`4.5 R`

HINT

Conservation of momentum and energy. Work energy theorem: Work done by gravitational force `=\Delta K.E.`

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