A 54.0 kg skier skis directly down a frictionless lope angled at 13.0 degrees to the horizontal. Choose the positive direction of the x-axis to be downhill along the slope. A wind force with component Fx acts on the skier. What is Fx if the magnitude of the skier's velocity is (a) constant, (b) increasing at a rate of 1.30 m/s^2, and (c) increasing at a rate of 2.60 m/s^2.