Finding Angular Acceleration for Easy Rotation Quest

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k, i know this is a braindead quest..but I am tied and can't think

a flywheel turns through 40 revs as it slows from an angular acceleration of 1.5 rads/s to 0. Find the time it takes to stop.

k..all I need to know is how do I find the angular acceleration?
 
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ok..nvm..i figured it out