If angular velocity is zero than angular acceleration is
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in your case the object is rotating with constant speed so tangential acceleration is zero so angular acceleration is zero. Angular velocity and angular acceleration are both in a direction parallel to the axis of rotation.
When the object reaches its highest point, then its velocity is 0 for a particular instant when it changes its direction but the object is still accelerating at a constant g=9.8 m/s.
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Yes,as angular acceleration is the time rate of change of angular velocity.
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