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A stone is dropped into a quiet pond and...

A stone is dropped into a quiet pond and waves move in circles outward from the place where it strikes, at a speed of 30 cm per second. At the instant when the radius of the wave ring is 50 mt, find the rate of increase in the area and in the circumference of the wave ring.

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The correct Answer is:
`30 pi m//sec, 0.6pi sq. m//sec`
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AAKASH SERIES-RATE OF CHANGE-Advanced Subjective Type Questions
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  2. If the rate of change in the area of a circle is it pi sq. cm/sec, the...

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