Choose the correct statement about the centre of mass $(CM)$ of a system of two particles.

  • A
    The $CM$ lies on the line joining the two particles midway between them.
  • B
    The $CM$ lies on the line joining them at a point whose distance from each particle is inversely proportional to the mass of that particle.
  • C
    The $CM$ lies on the line joining them at a point whose distance from each particle is proportional to the square of the mass of that particle.
  • D
    The $CM$ is on the line joining them at a point whose distance from each particle is proportional to the mass of that particle.

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