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Question 30518
JEE Physics · Medium

Center of Mass, Momentum and Collision: Perfectly Inelastic — Speed MCQ

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Perfectly Inelastic — SpeedMediumQuestion 30518

Question

A 5 kg block moving at 6 m/s collides and sticks to a stationary 10 kg block. Their combined speed is:
  1. A
    2 m/s
    Correct
  2. B
    3 m/s
  3. C
    4 m/s
  4. D
    6 m/s

Correct answer

2 m/s

Explanation

p_before = 5×6 = 30 kg·m/s = (5+10)×v_f → v_f = 30/15 = 2 m/s.

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