Three identical metal balls, each of the radius r are placed touching each other on a horizontal surface such that an equilateral triangle is formed when centres of three balls are joined. The centre of the mass of the system is located at ___________
(a) Line joining centres of any two balls
(b) Centre of one of the balls
(c) Horizontal surface
(d) Point of intersection of the medians
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My question is from Translational and Rotational Motion topic in division System of Particles and Rotational Motion of Engineering Physics I