Concepts A 75.0-kg cross-country skier is climbing a 3.0º slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N. Find his power output for work done against the gravitational force and air resistance. (b) What average force does he exert backward on the snow to accomplish this? (c) If he continues to exert this force and to experience the same air resistance when he reaches a level area, how long will it take him to reach a velocity of 10.0 m/s?

Step-by-step solution Step 1 of 8 Power is the rate at which work is done and it is given as, Here, P is the power, W is the work and t is the time period. And, work is the product of force and displacement and it is given as, Here, is the work, is the force and is the displacement.