Question: A simple pendulum has a bob of mass M. The bob is on a lightstring of length L. The string is fixed at C. At

A simple pendulum has a bob of mass M. The bob is on a lightstring of length L. The string is fixed at C. At position A,the string is horizontal and the bob is at rest. The bob isreleased from A and swings to B, where the string is vertical. Thetension in the string when the bob first reaches B is...?

The answer is 3 mg, but I don't know how that was arrived at. Can someone explain this to me?

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