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Physics problem: speed and force

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A skier of mass m starts from rest at the top of a ski slope of height h.

1. Now moving horizontally, the skier crosses a patch of soft snow, where the coefficient of friction is uk. If the patch is of width L1 and the average force of air resistance on the skier is F, how fast is she going after crossing the patch?
2. After crossing the patch of soft snow, the skier hits a snowdrift and penetrates a distance L2 into it before coming to a stop. What is the average force exerted on her by the snowdrift as it stops her?

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This solution calculates speed and average force of air resistance.

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A skier of mass m starts from rest at the top of a ski slope of height h.

1. Now moving horizontally, the skier crosses a patch of soft snow, where the coefficient of friction is . If the patch is of width L1 ...

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