How does an object's motion change as a result of centripetal acceleration? The speed decreases in the same direction. The speed increases in the same direction. The direction changes along with the speed. The direction changes but not the speed.

When we look at centripetal acceleration, the acceleration is a change in velocity. Since velocity is a vector, when we change direction, we have an acceleration even if the speed is not changing. An object's motion changes direction but does not change in speed when looking at centripetal acceleration.