Final answer:
The description of the motion of the ball depends on the reference frame and varies across different reference frames, as motion is a relative term that changes with the observer's point of view. It is essential to specify a reference frame when discussing motion to provide a clear and unambiguous description.
Step-by-step explanation:
The description of the motion of the ball is dependent on the reference frame and will be different for different reference frames. This is because motion is a relative term; it changes depending on what it is being compared to. For example, if you are standing still and watch a ball rolling by, it appears to be moving. However, if you are moving alongside the ball at the same speed and in the same direction, the ball will appear stationary relative to you.
Therefore, a correct statement would be that the motion of the ball is relative, which means it depends on the frame of reference from which it is observed. This is exemplified in situations like Boat A and Boat B traveling at constant speeds in opposite directions; each observer on the boats will describe the other boat's motion differently, based on their own moving reference frame.