Final answer:
An object traveling at a constant velocity in a straight line has zero acceleration. However, if the object changes direction while traveling at constant velocity, it will experience acceleration due to the change in direction.
Step-by-step explanation:
An object traveling at a constant velocity in a straight line has zero acceleration. Acceleration is the rate of change of velocity, and since the velocity of the object is not changing, there is no acceleration. However, if the object changes direction while traveling at constant velocity, it will experience acceleration due to the change in direction.