Solve please

4. A mass, M = 5.0 kg, is pulled by an applied force of 20.0 N at angle 0 above the horizontal surface. The friction between the surfaces is 4.00% of the block's weight. a) Calculate the angle O if the mass is accelerated at a rate of 1.20 m/s on the surface. (Ans = 60.09) How much force is needed to applied to the mass so that it would go at a constant velocity, knowing that the friction and the angle O stay the same? (Ans = 4 N)