Law of Interaction and its sample problem?

The Law of Interaction, often referred to as Newton's Third Law of Motion, states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another, the second object exerts an equal force in the opposite direction on the first object. For example, if a swimmer pushes backward against the water with a force of 50 N, the water exerts an equal and opposite force of 50 N forward on the swimmer, propelling them forward in the water.