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The bob of a simple pendulum swings in a vertical plane from left extreme A to right extreme B through the equilibrium position O. The work done by gravity force during the journey AO and OB are respectively

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positive, negative

zero, zero

negative, positive

positive, positive

answer is A.

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Detailed Solution

From A to O, the KE increases and this must be due to gravity force doing positive work on the bob. From O to B, the KE decreases

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