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Question 30270
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Laws of Motion and Friction: JEE — Constraint MCQ

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JEE — ConstraintHardQuestion 30270

Question

In a system with a pulley fixed to the ceiling, if block A (on table) has velocity 3 m/s to the right and the string goes over the pulley to block B hanging down, block B's velocity is:
  1. A
    6 m/s downward
  2. B
    3 m/s downward
    Correct
  3. C
    1.5 m/s downward
  4. D
    3 m/s upward

Correct answer

3 m/s downward

Explanation

For a simple fixed pulley, the string length is constant, so if A moves right at 3 m/s, B moves down at 3 m/s (same rate).

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