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2015-03-10T16:08:34+05:30

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When a particle moves in a circular path with uniform speed, its angular velocity remains constant i.e. both the direction and magnitude of the angular velocity remain same. The magnitude will depend on the speed of the particle and the direction is always perpendicular to the plane of motion. So after completing half of the circular path, the direction will be perpendicular to the plane of motion.
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2015-03-10T16:11:16+05:30
THROUGH 90 DEGREE ANGLE ,ITS ANGULAR VELOCITY WILL CHANGE
WHEN IT COMPLETES HALF OF THE CIRCULAR PATH.
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