A particle is moving in a uniform circular motion with constant speed $V$ along a circle of radius $r$. The acceleration of the particle is:

In a uniform circular motion, even though the speed $V$ remains constant, the direction of the velocity vector changes continuously at every point along the circular path. This change in direction creates a continuous acceleration directed toward the center of the circle, known as centripetal acceleration ($a_c$).
The magnitude of this centripetal acceleration is mathematically expressed as:

$$a_c=\frac{V^2}{r}$$