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A wheel is rotating at 900 rpm about its...

A wheel is rotating at 900 rpm about its axis . When the power is cut off it comes to rest in 1 min. The angular retardation in `rad//s^2` is

A

`pi/2`

B

`pi/4`

C

`pi/6`

D

`pi/8`

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The correct Answer is:
D
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