A 57.0-kg skier starts from rest at the top of a ski slope of height 67.0.
a) Now moving horizontally, the skier crosses a patch of soft snow, where the coefficient of friction is 0.16. If the patch is of width 67.0 and the average force of air resistance on the skier is 170 , how fast is she going after crossing the patch?
b) After crossing the patch of soft snow, the skier hits a snowdrift and penetrates a distance 2.0 into it before coming to a stop. What is the average force exerted on her by the snowdrift as it stops her?