Two cartons sit next to, and touching, each other on a frictionless horizontal surface. The lighter carton has a mass of 5.28 kilogram and the heavier carton has a mass of 7.44 kilogram.
(a) Calculate the contact force between these cartons when a horizontal force of 5.2 N is applied to the light carton.
(b) Verify your answer to part (b) by calculating the contact force in this case.