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If radius of a spherical bubble starts t...

If radius of a spherical bubble starts to increase with time t as `r=0.5t`. What is the rate of change of volume of the bubble with time `t=4s`?

A

`8pi` units/s

B

`4pi` units/s

C

`2pi` units/s

D

`pi` units/s

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The correct Answer is:
A
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