일반물리학 1 — Force and Motion-I: Problem 38

38 A 50 kg skier skis directly down a frictionless slope angled at 10° to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component $F_x$ acts on the skier. What is $F_x$ if the magnitude of the skier’s velocity is (a) constant, (b) increasing at a rate of 1.0 m/s², and (c) increasing at a rate of 2.0 m/s²?