Question: A disc rotating clockwise with angular speed 4 . 2 rad / s reverses its direction to rotate counterclockwise with 4 . 2 rad /

A disc rotating clockwise with angular speed 4.2 rad/s reverses its direction to rotate
counterclockwise with 4.2 rad/s. What is the angular acceleration if change of direction
happens in 4.0 seconds? What is the average angular velocity for this motion?

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