* Velocity is a vector: It has both magnitude (speed) and direction.
* Direction is relative: We define a positive direction and a negative direction. For example, going east might be positive, and going west might be negative.
So, how do we use "negative velocity"?
We use negative velocity to indicate the direction of motion *relative* to a chosen reference frame.
Examples:
* A car traveling westward: If east is positive, the car has negative velocity.
* A ball thrown upwards: If upwards is positive, the ball has negative velocity on the way down.
Important points:
* Zero velocity: An object at rest has zero velocity.
* Negative velocity doesn't mean "moving backwards": It just indicates motion in the opposite direction of our chosen positive direction.
In summary: "Negative velocity" is a way to express the direction of motion in a chosen coordinate system. It doesn't mean the object is moving backward; it simply means it's moving in the opposite direction of what we've defined as positive.
