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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 50 cm/sec. When the radius of the wave-ring is 75 metres, the rate of increase of its circumference and area are respectively

A

` 2pi m//s, 75m ^(2)//s`

B

`pi m //s, 75 pi m ^(2) //s`

C

`2 pi m // s, 50 pi m ^(2) //s`

D

` pi m ^(2)//s, 75 pi m //s`

Text Solution

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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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