Two boxes sit side-by-side on a smooth horizontal surface. The lighter box has a mass of 5.18 kg, the heavier box has a mass of 7.51 kg.
(a) Find the contact force between these boxes when a horizontal force of 3.9 N is applied to the light box.
(a) Find the contact force between these boxes when a horizontal force of 3.9 N is applied to the light box.