# Physics

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?

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1. force up: mg*SinTheta
power up=(mgSinTheta-25)velocity

b. force backward=force up+25

c. net force=ma
forceup-25=ma solve for a, then

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