Answer
If an object is traveling at a constant velocity, then it is necessarily traveling in a straight line.
Work Step by Step
Velocity tells us the speed and direction of an object. If the velocity is constant, then the object continues to move at the same speed in the same direction. Since the direction does not change, the object must be moving in a straight line.
If an object is traveling at a constant velocity, then it is necessarily traveling in a straight line.