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

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

(a) Horizontal surface

(b) Centre of one of the balls

(c) Line jointing centres of any two balls

(d) Point of intersection of the medians

Ans: (d)