Question

Why is velocity not constant in uniform circular motion?

Answer 1

Here is your answer ⬇️⬇️⬇️⬇️

Accelerating objects are objects which are changing their velocity - either the speed (i.e., magnitude of the velocity vector) or the direction. An object undergoing uniform circular motion is moving with a constant speed. Nonetheless, it is accelerating due to its change in direction.

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Answer 2

because velocity is a vector quantity and it depends upon direction.

As direction keeps changing in circular path it do not remain constant