Final answer:
An object moving at a constant velocity means it is in linear motion with a constant speed and no acceleration.
Step-by-step explanation:
An object moving at a constant velocity means that it is in linear motion with a constant speed. When an object has a constant velocity, it is moving at the same speed and in the same direction without changing.
For example, if a car is moving at a constant velocity of 60 km/h in a straight line, it means that it maintains the same speed and direction without speeding up or slowing down.
Objects moving at a constant velocity have an acceleration of zero. This means that the net external force acting on the object is also zero, resulting in a balanced force.