A block of mass ma is pulled along a rough horizontal surface by an applied force of F - 4.2 N with an angle of # - 8.8" with respect to the horizontal. Due to the applied force, the block moved a distance d = 10 m along the surface at a constant speed, If the coefficient of kinetic friction between the surface and the block is Ate - 0.4, what is the work done by the friction force? Express your answer in units of N . m using one decimal places. Take g - 9.80 m/s