Question

why a particle rotating in a circle has constant speed but its velocity changes continuously

Answer 1

As the direction keeps on changing...

Answer 2

Hola User______________

Actually if we study about the concept of the Circular Motion ...then actually we find that the term speed is actually a scalar quantity which has only the magnitude .....thus its constant In direction.....
But ...if we consider the velocity in the circular motion is actually the angular velocity which gradually changed as the velocity depends on the both magnitude and the direction...thus the direction in the circular motion gradually changes so the velocity is not constant it varies over the motion....

Hope this helps u...☺