A student at a skateboarding park is rolling on a skateboard down a ramp with a 26.0degree incline. (a) Consider the student and skateboard as a single unit and draw a free-body diagram to represent the forces present on the student and skateboard unit. (b) Explain what relationship must exist between the forces for the student to accelerate down the slope. (c) If the student and skateboard have a mass of 60.0 kg. what is the magnitude of the force of gravity parallel to the slope? (d) If the coefficient of kinetic friction in the wheels and bearings is 0.120 and the force of air friction is 20.5 N, what is the total force of friction on the student and skateboard? (e) Calculate the acceleration of the student and skateboard down the slope.