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The angular frequency of n fan increases...

The angular frequency of n fan increases from 30 rpm to 60 rpm in `pi s`. A dust particle is present on the blades at a distance of 20 m from axis of rotation. The net acceleration of dust particle at the end of `pi s` is

A

`2.8 ms^(-2)`

B

`7.9 ms^(-2)`

C

`9.2 ms^(-2)`

D

`6.2 ms^(-2)`

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The correct Answer is:
B
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