A disk, initially rotating at 120 rad/s, is slowed down

A disk, initially rotating at 120 rad/s, is slowed down

A disk, initially rotating at 120 rad/s, is slowed down with a constant angular acceleration of magnitude 4.0 rads2.
(a) How much time does the disk take to stop?
(b) Through what angle does the disk rotate during that time?

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