a = v²/r
where:
* a is the acceleration (also called centripetal acceleration)
* v is the speed of the object
* r is the radius of the circular path
Explanation:
Even though the object's speed is constant, its velocity is constantly changing because its direction is changing. This change in velocity is what causes the acceleration.
The acceleration is always directed towards the center of the circle, which is why it's called centripetal acceleration (meaning "center-seeking").
