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Question 6105
NEET Physics · Easy

System of Particles & Rotational Motion: Centre of Mass MCQ

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Centre of MassEasyQuestion 6105

Question

Centre of mass of a system of particles moves with constant velocity if:
  1. A
    All particles move
  2. B
    Net external force is zero
    Correct
  3. C
    Net internal force is zero
  4. D
    Particles are at rest

Correct answer

Net external force is zero

Explanation

By Newton's 2nd law for COM: F_ext = Ma_cm. If F_ext = 0, a_cm = 0 → COM moves with constant velocity.

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