In uniform circular motion, the body has a constant speed but it experiences acceleration. This may seem counterintuitive, but it is a result of the body constantly changing its direction while maintaining a constant magnitude of velocity.
Acceleration is defined as the rate of change of velocity. Velocity is a vector quantity that includes both magnitude (speed) and direction. In uniform circular motion, although the speed remains constant, the direction of the velocity vector is continuously changing as the object moves around the circle.
The acceleration in uniform circular motion is called centripetal acceleration, and it is directed toward the center of the circle. It is responsible for continuously changing the direction of the object's velocity, allowing it to follow the circular path. The centripetal acceleration is always perpendicular to the velocity vector, so it does not change the magnitude (speed) of the velocity.
In summary, in uniform circular motion, the body has a constant speed (magnitude of velocity) but experiences acceleration (centripetal acceleration) due to the continuous change in direction.