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A stone dropped into a pond of still wat...

A stone dropped into a pond of still water sends out concentric circular waves of water,from the point of disturbance, at the rate of 4 cm/sec. When the radius of the wave-ring is 15 cm, the disturbed area is changing at the rate of s

A

`12 pi cm^(2)// sec`

B

`20 pi cm^(2)// sec`

C

`1.2 pi cm^(2)//sec`

D

`0.12 pi cm^(2)// sec.`

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The correct Answer is:
B
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MARVEL PUBLICATION-APLICATIONS OF DERIVATIVES-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP - II : CHAPTER 12)
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