Question

Helen is standing in the hallway with her friend Janet, next to Helen's locker. Each girl has a body mass of 48 kilograms (kg), and thus each exerts a force of 470.4 Newtons (N) on the hall floor. What is the total force, in Newtons (N), that the hall floor exerts on the pair of girls?

Answer 1

According to the Third Law of Newton, the floor will exert a force on the bodies of the same magnitud that the bodies exert on it, with opposite direction.

Then, the floor exerts a force of 470.4 N on each girl for a total of 2*470.4 N = 940.8 N