When the carousel is moving at a constant speed it is accelerating.

The answer is: correct

When a carousel moves at a constant speed, it accelerates. Acceleration is defined as the rate of change of velocity in a given time frame. This means that when a carousel is moving at a constant speed, it is still accelerating because its speed is changing with respect to time. The difference between speed and acceleration is that speed is the rate of movement in a specific direction, while acceleration measures the rate of change in speed over time. This means that acceleration is the rate of change in velocity over a given period of time. Therefore, even if the circle is moving at a constant speed, it is still accelerating.