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The frequency of a particle performing c...

The frequency of a particle performing circular motion changes from 60 rpm to 180 rpm in 20 s. Then the angular acceleration is

A

`0.1 pi rad //s^2`

B

`0.2 pi rad //s^2`

C

`0.3 pi rad // s^2`

D

`0.4 pi rad // s^2`

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