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Standard XII
Physics
Applying NLM along 3 Axis
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
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Solution
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[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

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