A skier of mass m = 75 kg travels along the path shown in the figure. He starts at point A with velocity vA = 5.0 m/s. Over the part of the path between points B and C the snow is slushy and the coefficient of kinetic friction k between the snow and the skier is 0.12. Friction can be ignored for the rest of the path. a. (8) Determine the velocity vB of the skier at point B. b. (8) The distance L between B and C is 20 m. Calculate the work Wf done by friction on the skier between points B and C. c. (9) Calculate the velocity vC of the skier at point C.