A block A of mass mA = 3 kg lies on a horizontal table in contact with a block B of mass mB = 2 kg. An external force F = 40 N is applied to block B, as shown in the figure below, such that both blocks are sliding to the left. A coefficient of kinetic friction µk = 0.1 exists between each block and the table. Using g = 10 m/s^2, what is the magnitude of the contact force between the two blocks?
10 N
16 N
24 N
18 N
15 N