A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off. What force does the wall exert on the ball?

By Newton’s third law, the wall exerts an equal and opposite force to the force the ball exerts on the wall. The ball pushes the wall with 10 N to the left, so the wall pushes the ball with 10 N to the right. Bouncing off does not change this force-pair relationship.

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