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

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

A

4.5R

B

7.5R

C

1.5R

D

2.5R

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