Question

Why velocity changes during uniform circular motion

Answer 1

it does not change......

Answer 2

Helloo!!

Velocity is actually a vector quantity, which implies that it is decribed by magnitude and direction.
The magnitude of the velocity vector is the speed of the object.

In the case of a uniform circular motion, the direction of the moving object is always tangent to the circular path, which is why velocity changes despite the fact that speed is constant.

hope it helps