While training, the athlete pushes a mass of pounds up an inclined surface for a distance of m at a steady pace. The incline is positioned at a deg angle above the horizontal axis. A frictional force of N acts between the mass and the inclined surface. Note: kg is equivalent to pounds. a Find the work done by the frictional force.

b Determine the work done by the legs pushing in Cal. J Cal

c Find the legs pushing force.