Which of the following parameters of a particle executing uniform circular motion remains constant?
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The magnitude of the velocity of the particle, that is speed v remains constant and velocity vector changes from time to time. Therefore, it accelerates radially inwards. This is known as Centripetal acceleration, a r . Its magnitude 
remains constant where as its direction changes from time to time. Therefore 
is not constant. Since the sense of rotation of the particle remains constant its angular velocity 
remains constant in direction. Hence is correct.
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