Imagine two race cars driving at a constant speed of 225 mph. One is driving in a straight line, and the other is driving around a race track. Which car has a constant velocity? Which car has a changing velocity?
Both cars have a changing velocity.
The car driving around the race track has a constant velocity, and the car driving in a straight line has a changing velocity.
The car driving in a straight line has a constant velocity, and the car driving around the race track has a changing velocity.
Both cars have a constant velocity.