Question

A towline is attatched between a car and a glider. As the car speeds due north along the runway, the towline exerts a horizontal force of 769 N on the glider. What is the magnitude and direction of the force exerted by the glider on the towline?

Answer 1

According to 3rd Newton’s law:
F_12=-F_21
Thus, the magnitude of the force exerted by the glider on the towline is 769 N. The direction of the force exerted by the glider on the towline is southward.