Two horizontal forces, F1 and F2, are acting on a box, but only F1 is shown in the drawing. B2 can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that F1=+2.2N and the mass of the box is 3.9kg. Find the magnitude and direction of F2 when the acceleration of the box is (a) +5.4m/s2,(b)5.4m/s2, and (c)0m/s2