Which of the following statements regarding centre of mass is NOT true?

• A

  For two particles of equal mass, the centre of mass lies exactly midway between them
• B

  For three non-linear particles of equal mass, the centre of mass coincides with the centroid of the triangle formed by the particles
• C

  When the total external force on a system is zero, the velocity of the centre of mass of the system remains constant.
• Correct answer
  D

  For two particles of different masses, the centre of mass of the particles is nearer to the particle of lesser mass.

Hence, the correct answer is option: 'D'.