An extreme skier, starting from rest, coasts down a mountain that makes an angle 25.0° with the horizontal.
The coefficient of kinetic friction between her skis and the snow is 0.200.
She coasts for a distance of 12.3 m before coming to the edge of a cliff.
Without slowing down, she skis off the cliff and lands downhill at a point whose vertical distance is 3.70 m below the edge.
How fast is she going just before she lands?
I believe I need to use the kinetic energy theorem.
i'm not good with the friction formulas.