See answer: A stone is dropped into a lake, creating a circular ripple that travels
Chapter 1, Problem 55(choose chapter or problem)
A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 60 cmys. (a) Express the radius r of this circle as a function of the time t (in seconds). (b) If A is the area of this circle as a function of the radius, find A 8 r and interpret it.
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