A ceiling fan is rotating about its own ...

A ceiling fan is rotating about its own axis with uniform angular velocity `omega`. The electric current is switched off then due to constant opposing torque is its angular velocity is reduced to `(2 omega)/3` as it completes `30` rotations. The number of rotations further it makes before coming to rest is

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The correct Answer is:

`0=(m_(1)y_(1)+m_(2)y_(2)+m_(3)y_(3))/(m_(1)+m_(2)+m_(3))`

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