5. [-/3 Points] DETAILS SCALC9 1.3.059. A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 60 cm/s. (a) Express the radius r (in cm) of this circle as a function of time t (in seconds). r (t ) = cm (b) If A is the area of this circle as a function of the radius, find A o r. (A or) (t) = Interpret your answer. This formula gives the circumference of the rippled area (in cm) at any time t. This formula gives the radius of the rippled area (in cm) at any time t. This formula gives the extent of the rippled area (in cm2) at any time t. Submit Answer Viewing Saved Work Revert to Last Response