An object has constant velocity when it is moving at a constant speed in a straight line. This means:

* Constant speed: The object does not speed up or slow down.

* Straight line: The object does not change direction.

Here are some examples:

* A car traveling at a steady 60 mph on a straight highway.

* A ball rolling across a frictionless surface at a constant speed.

* A satellite orbiting Earth at a constant speed and altitude.

It's important to remember:

* Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.

* Constant velocity implies constant speed and direction.

Let me know if you'd like any more explanation or examples!