Question

which scenario best describes motion?
a toy train in position 4 on a number line
a race track that is 100 meters long
a ball rolling from point a to point b
a student living 150 miles from chicago

Explanation:

Motion is defined as a change in position over time. The first option describes a fixed position, the second is a static object (track), the fourth is a fixed distance between a location and a person. Only the ball moving between two points shows a change in position, which is motion.

Answer:

a ball rolling from point A to point B