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Three identical spheres each of mass 1 k...

Three identical spheres each of mass 1 kg are placed touching one another with their centres in a straight line. Their centres are marked as A, B, C respectively. The distance of centre of mass of the system from A is

A

`frac(AB + AC)(2)`

B

`frac(AC + AB)(2)`

C

`frac(AC - AB)(3)`

D

`frac(AB + AC)(3)`

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