* Acceleration is the rate of change of velocity. It means that an object's velocity is changing over time.
* Constant velocity means the velocity is not changing.
Therefore, motion with constant velocity is a special case of acceleration where the acceleration is zero.
Think of it this way:
* Acceleration: The car is speeding up or slowing down.
* Constant velocity: The car is moving at a steady speed in the same direction.
Let me know if you'd like more examples or explanations!