A 70 kg rollerblader skates across a skating rink floor. The graph below shows the net external force component F cos(0) along the displacement as a function of the magnitude of the displacement d. F cos 0 40 N 0 5.0 m 10.0 m d Determine the following. (a) the work done (in J) by the net force component F cos(0) acting on the rollerblader as he moves from 0 to 5.0 m J (b) the work done (in J) by the net force component F cos(0) acting on the rollerblader from 5.0 m to 10.0 m J