Question: A cooling fan is turned off when it is running at 8 8 0 rev / minrev / min . It turns 1 2 0

A cooling fan is turned off when it is running at 880 rev/minrev/min . It turns 1200 revolutions before it comes to a stop.
What was the fan's angular acceleration, assumed constant?
How long did it take the fan to come to a complete stop?

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