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A spherical ballon is filled with 4500pi...

A spherical ballon is filled with `4500pi` cubic meters of helium gas. If a leak in the ballon cause the gas to escape at the ratio of `72pi` cubic meters per meters, then the rate (in meters per minute) at which the radius of the ballon decreases 49 minutes after the leakage bagan is

A

`2//9`

B

`9//2`

C

`9//7`

D

`7//9`

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The correct Answer is:
A
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AAKASH SERIES-RATE MEASUREMENT-PRACTICE SHEET (EXERCISE - 1) (LEVEL - 1) (STRAIGHT OBJECTIVE TYPE QUESTION)
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  17. A particle moves on a line according to the law s = at^(2) + bt + c. I...

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