11. Mario is on a swing moving back and forth as the swing ropes is being pulled uniformly decreasing their length at a constant rate. Which of the following is true? Explain why. *   a. The moment of inertia of Mario is decreasing. b. The moment of inertia of Mario is conserved. c. The period of the swing is increasing. d. The period of swing is decreasing. e. The angular momentum of Mario is not conserved.

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