Physics
posted by John .
A certain CD has a playing time of 76 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 102 rpm. Find the magnitude of the average angular acceleration of the CD. Express your answer in rad/s2.

<angular acceleration>=(final w initial w)/time
change w to rad/sec before starting, and time in seconds.
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