Question

# Three identical spheres each of mass m and radius R are placed touching each other so that their centres A, B and C lie on a straight line. The position of their centre of mass from the centre of A is

A
2R3
B
2R
C
5R3
D
4R3
Solution
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#### [B] From Symmetry B is the centre of ABC combined.Position of centre of mass of ABC (combined) fromcentre of A=R+R=2R 12
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