hi I am new here, but I signed up to ask this question. I was looking at a high school physics exam from last june and one of the questions seems to me like it's unfair. I think they didn't give enough information to solve the problem. here it is; An 80-kilogram skier slides on waxed skis along a horizontal surface of snow at constant velocity while pushing with his poles. What is the horizontal component of the force pushing him forward? (1) 0.05 N (2) 0.4 N (3) 40 N (4) 4 N The correct answer is supposedly #3, but I am really unsure why. The problem and the supplied formula tables made no mention to air resistance or friction forces that oppose his forward momentum. If the skier is already at a constant velocity and we neglect any opposing forces, we shouldn't need to apply any extra forces to keep him moving. Am I mistaken?