when we have to use mvr and when. we have to use Iw, while calculating angular speed
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Conservation of Angular Momentum
When an object is spinning in a closed system and no external torques are applied to it, it will have no change in angular momentum. The conservation of angular momentum explains the angular acceleration of an ice skater as she brings her arms and legs close to the vertical axis of rotation.
Angular velocity is the rate of change of the position angle of an object with respect to time, so w = theta / t, where w = angular velocity, theta = position angle, and t = time
Hope you understood the difference.
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