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Question

A pendulum of mass m kg and length l m is released from rest at angle θ=30 with the vertical. The power delivered by all the forces acting on the bob at angle θ=15
  1. Must be positive
  2. Must be negative
  3. May be zero
  4. May be negative


Solution

The correct option is D May be negative
Power is positive if speed is increasing and vice versa.

Speed is decreasing, power is negative

Speed is increasing, power is positive

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