1. The problem describes the forces acting on a person during a car crash and how Newton's laws explain the motion. 2. Newton's First Law states that an object in motion stays in motion with the same velocity unless acted upon by an unbalanced force. Here, the person continues moving forward because no unbalanced force initially acts on them. 3. When the person moves against the seat belt, they exert a force on it. According to Newton's Third Law, the seat belt exerts an equal and opposite force back on the person. 4. This interaction causes a controlled deceleration of the person, slowing them down safely. In summary, Newton's First Law explains the person's initial motion, and Newton's Third Law explains the forces between the person and the seat belt that cause deceleration.