Question

in uniform circular motion which of the following quantity is not remain same a.radius b.velocity c. speed d. all of these
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Answer 1

b. Velocity

In case of uniform circular motion, the object travells equal distance in equal intervals of time. ⇒ Speed is constant in such cases. Also, radius always remains constant. The path is not elliptical.

Velocity becomes correct as displacement changes, it sometimes become zero, positive and negative here. Also, direction changes. That means it has a non uniform velocity of an acceleration.