This is centripetal acceleration. Although there is no change in speed, there is a force and hence (by Newton's second law) an acceleration necessary to keep the object traveling in a circle.
Mathematically, it is equal to v^2 / r or equivalently the velocity squared divided by the radius of the circle.What is the type of acceleration that occurs when an object travels at a constant speed in circular motion?
constant speed means there is no acceleration.
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