Contact Forces Between Blocks_2.1

Three (3) boxes are in contact with each other on a frictionless horizontal surface as shown right. The masses of the boxes are m1 = 10 kg, m2 = 14 kg, and m3 = 20 kg. A horizontal force F = 88 N is applied to m1.
Calculate the acceleration of the three boxes.
Calculate the net force ΣF on each box.
Calculate the contact forces between the boxes.