Two boxes of mass mA= 4.3 kg and mB= 2.2 kg are placed next to each other on a horizontal surface. A force of 30 N is applied to box A in a direction of 40◦ below the horizontal.

(a) Draw a free body diagram for box A, box B, and the combined system of box

A and B.

(b) Find the acceleration of the system.

(c) Find the magnitude of the force that box B exerts on box A.