The angular acceleration of a body, moving along the circumference of a circle, is
Along the radius, away from centre
Along the radius towards the centre
Along the tangent to its position
Along the axis of rotation
Angular acceleration is a vector quantity defined as the rate of change of angular velocity. For a body moving in a circle, the angular velocity vector is directed along the axis of rotation. Consequently, the angular acceleration vector also points along the axis of rotation.
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