A rolling ball slows down. Which claim about the forces acting on the ball must be true? Choose 1 answer: Choose 1 answer: (Choice A) A There are no forces on the ball. (Choice B) B There is no net force on the ball. (Choice C) C There is a net force on the ball. (Choice D) D There is not enough information.

Answer C: There is a net force on the ball

Explanation:

Newton's first law of motion says that:

"very object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force."

For an object to change its state of motion, a force must be applied, and since the ball is changing its state of motion (it is slowing down - its speed is being reduced - its uniform motion is being changed), we can affirm that there must be a net force applied to it.

Therefore, answer C: "There is a net force on the ball" is the correct answer.