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?
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
