What is the acceleration produced when a force of 5 N acts on a mass of 20 kg?

The magnitude and direction of the acceleration produced in a body of mass 5 kg when two mutually perpendicular forces 8 N and 6 N act on it, are respectively:

Two blocks of masses 3 kg and 1 kg are placed in contact on a smooth horizontal surface. A horizontal force F = 5 N is applied on the 3 kg block from the left. Find the contact force exerted between the two bodies.