When Arti kicks a football, two forces interact. Arti's foot exerts a force of 5N on the ball. What size force will be exerted on Arti's foot?

A size force of 5N will be exerted on Artl's foot.

This is because Newton's third law of motion, where in which an action occurs, a reaction will occur with the same amount of force, but reversed towards the direction of the area where the action occurred.