A block is moving at a constant speed of +2 m/s in the posit…

A block is moving at a constant speed of +2 m/s in the positive x-direction, and has three forces acting on it, F1, F2 and F3. F1 = +6 N, F2 = -2 N (the + and – signs refer to the positive and negative x-directions respectively throughout the question). What is F3?