Question

explain why the motion of a body which is moving with constant speed in a circular path is said to be acceleration

Answer 1

Acceleration is change in velocity over time, not change in speed. An object can change direction without changing speed. ... That means it has both direction and a magnitude. In a uniform circular motion the magnitude of the velocity is constant but the direction keeps changing.

Answer 2

motion of body with constant speed in circular motion is said to be on acceleration because acceleration is a vector quantity which depends on both measure and direction. In case of circular motion body continuously use to change its direction and hence it is said to be in acceleration.