Final answer:
When the cannonball is in flight, it experiences action-reaction pairs. One example is the force exerted by the cannonball pushing the air molecules away, while the air molecules exert a reaction force, pushing the cannonball forward. Another example is the force of gravity pulling the cannonball down, while the cannonball exerts a reaction force on Earth, pulling it slightly upward.
Step-by-step explanation:
In projectile motion, the cannonball experiences action-reaction pairs when it is in flight. The action force is the force exerted by the cannonball, while the reaction force is the force exerted on the cannonball. For example, when the cannonball is in flight, the action force is the force exerted by the cannonball pushing the air molecules away. The reaction force is the force exerted by the air molecules on the cannonball, pushing it forward. Another action-reaction pair occurs when gravity pulls the cannonball downward. The action force is the force of gravity pulling the cannonball down, and the reaction force is the force exerted by the cannonball on Earth, pulling it slightly upward.