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 centres of the three balls are joined. The centre of mass of the system is located at:

  • A
    horizontal surface
  • B
    centre of one of the balls
  • C
    line joining centres of any two balls
  • D
    point of intersection of the medians

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