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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
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B
2R
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C
5R3
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D
4R3
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Solution

The correct option is B 2R
[B] From Symmetry B is the centre of ABC combined.
Position of centre of mass of ABC (combined) from
centre of A=R+R=2R

1214909_40054_ans_ed3cd7f91dd646fc9a5661d9d563c121.PNG

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