This question involves the concepts of motion and rest.
The scenario of " a rolling ball" describes the motion best.
A body is said to be in a state of motion if it changes its position with respect to its surrounding. While a body is to be in a state of rest if it does not change its position with respect to its surrounding.
If we analyze the cases of a toy train in position 4 on a number line, a race track that is 100 meters long, and a student living 150 miles from Chicago, we can clearly see that all these scenarios show a fixed object that does not change its position with respect to its surrounding. Hence, these are all examples of the state of rest.
The rolling ball on the other hand is constantly changing its position with respect to its surrounding. Hence, it is a perfect example of the state of motion.
Learn more about motion and rest here:
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The attached picture differentiates between the states of rest and motion.
