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Question 30539
JEE Physics · Hard

Center of Mass, Momentum and Collision: COM — Moving Away MCQ

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COM — Moving AwayHardQuestion 30539

Question

A man (60 kg) walks from one end of a boat (40 kg, length 10 m) to the other on frictionless water. How far does the boat move?
  1. A
    4 m
  2. B
    6 m
    Correct
  3. C
    3 m
  4. D
    10 m

Correct answer

6 m

Explanation

COM stays fixed. If man moves 10−d relative to ground (d = boat displacement), by COM: 60(10−d) = 40×d → 600−60d = 40d → d = 6 m.

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