(Answered) A person on a swing moves so that the chain is horizontal

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A person on a swing moves so that the chain is horizontal at the turning points. Show that the centripetal acceleration of the person at the low point of the arc is exactly 2 g, regardless of the length of the chain. This means that the force on the chains at the low point is equal to three times the person's weight.(Hint: The vertical distance between the turning point and the low point equals the length of the chain.)

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