Question: A stone is dropped into a calm lake causing a series of circular ripples. The radius of the outer one increases at 0.2 m/s. How

A stone is dropped into a calm lake causing a series

A stone is dropped into a calm lake causing a series of circular ripples. The radius of the outer one increases at 0.2 m/s. How rapidly is the disturbed area changing at the end of 3 s?

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