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Question 30526
JEE Physics · Medium

Center of Mass, Momentum and Collision: COM — System Acceleration MCQ

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COM — System AccelerationMediumQuestion 30526

Question

The acceleration of the COM of a system equals:
  1. A
    Sum of all forces on all particles
  2. B
    F_external / total mass
    Correct
  3. C
    F_internal / total mass
  4. D
    Zero always

Correct answer

F_external / total mass

Explanation

a_cm = F_net_external / M_total. Internal forces cancel in pairs (Newton's 3rd law).

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