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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

The horizontal surface

B

The line joining centres of any two balls

C

The centre of one of the balls

D

The point of intersection of the medians

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The correct Answer is:
D
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