Question

why uniform circulated motion is an accelerated motion?

Answer 1

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

Answer 2

It is called so because at every instant of time the direction changes , Velocity being a Vector quantity also changes its value , hence , it is called as accelerated motion.