What does constant velocity imply about acceleration?

Constant velocity means that an object's speed and direction remain unchanged over time. Since acceleration is defined as the rate of change of velocity, a situation where the velocity remains constant implies that there is no change in speed or direction. Therefore, there is no acceleration occurring.

For an object to have acceleration, it must be experiencing a change in either its speed or its direction. Constant velocity indicates that both speed and direction are steady, firmly establishing that the acceleration is zero. This concept is foundational in mechanics and helps in understanding dynamics in physics.