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An exhaust fan is rotating with an angular velocity of 216 rad/min. When it is switched off, it is observed that the angular retardation of the fan is α=32√t rad/min2. The time taken by the fan to stop completely is

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An exhaust fan is rotating with an angular velocity of 216 rad/min. When it is switched off, it is observed that the angular retardation of the fan is α=32t rad/min2. The time taken by the fan to stop completely is



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