A mother is sitting on a bench that is 30 ft from where her son is...

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A mother is sitting on a bench that is 30 ft from where her son is playing with a balloon. The son accidentally lets go of the balloon, and the balloon rises at a constant rate of 6 ft/s. Find the rate at which the angle of elevation from the mother to the balloon changes at the instant when the balloon is 60 ft from the mother. A mother is sitting on a bench that is 30 ft from where her son is playing with a balloon. The son accidentally lets go of the balloon, and the balloon rises at a constant rate of 6 ft/s. Find the rate at which the angle of elevation from the mother to the balloon changes at the instant when the balloon is 60 ft from the mother.