Three identical metal balls each of radius r are placed touching each other on a horizontal surface such that an equilateral triangle in formed, when the centres of three balls are joined. The centre of mass of the system is located at the _______.
A. horizontal surface
B. centre of one of the balls
C. the line joining centres of any two balls
D. point of intersection of the medians
Answer:D
Three identical metal balls each of radius r are placed touching each other on a horizontal surface such that an equilateral triangle in formed, when the centres of three balls are joined. The centre of mass of the system is located at the _______.
A. horizontal surface B. centre of one of the balls C. the line joining centres of any two balls D. point of intersection of the medians