Velocity can be zero when an object is at rest, meaning it is not moving relative to a chosen frame of reference.

Here's why:

* Velocity is a vector quantity: This means it has both magnitude (speed) and direction.

* Zero magnitude: An object at rest has a speed of 0, which means the magnitude of its velocity is zero.

* No direction: Since the object isn't moving, it doesn't have a direction.

Therefore, when both magnitude and direction are zero, the object's velocity is also zero.

Example: A car parked in a garage has a velocity of zero because it is not moving relative to the garage.