Two spherical bodies of mass M and 5M a...

Two spherical bodies of mass M and 5M and radii R and 2R 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

`4.5R`

`7.5R`

`1.5R`

`2.5R`

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