A pendulum of mass 1 kg and length  = 1...

A pendulum of mass 1 kg and length  = 1m is released from rest at angle  = 60º. The power delivered by all the forces acting on the bob at angle  = 30º will be: (g = 10 m/s2)

`13.5` watt

`20.4` watt

`24.6` watt

Zero

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