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Three identical metal balls each of radi...

Three identical metal balls each of radius `r` are placed touching each other on a horizontal surface such that an equilateral triangle is formed, when the center of three balls are joined. The center of mass of system is located at the

A

horizontal surface

B

centre of one of the balls

C

line joining the centres of any two balls

D

point of intersection of the medians

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d
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