* At Rest: This is the most straightforward case. If an object is not moving, its velocity is 0.
* Instantaneously Changing Direction: Imagine a ball thrown straight up in the air. At the peak of its trajectory, for a brief moment, its velocity is 0. This is because it has stopped moving upwards and is about to start moving downwards.
Key Points:
* Velocity is a vector: It has both magnitude (speed) and direction.
* Zero velocity doesn't mean zero acceleration: An object can have zero velocity and still be accelerating (like the ball at the peak of its trajectory).
* The concept of "at rest" is relative: Something that appears at rest to us might be moving relative to something else (like a person sitting on a moving train).
