Question

obtain a relation of angular momentum​

Answer 1

Notice the equation L = r⊥mv the angular momentum of the body only changes when there is a net torque applied on it. So, when there is no torque applied, the perpendicular velocity of the body will depend upon the radius of the circle. I.e. the distance from the center of mass of the body to the center of the circle.

Answer 2

Answer:

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