Ripple on a pond
A pebble dropped into a still pond creates a circular ripple whose radius grows at a constant feet per second. At the instant seconds after the drop, how fast is the enclosed area increasing? Give the value in square feet per second to two decimal places.
Show hints (2)+
- Start from and differentiate in time: .
- Find the radius at s first, then plug in .
Answer
Reveal answer →Final answer
251.33 (± 0.05)
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