9. (15 pt) A 50kg skier is traveling down a small 11.0 meter high slope. a) If the slope is frictionless, what is her speed when she reaches the bottom? $21/2 m= song linear momentum P= mv work 11:0 m use conservation of song ? 1/2mv V ? 1/2 501 4 energy P=MV V my 5 = 4 54 mis = 515 b) Now assume there is a constant force of friction against her as she skis. If her speed upon reaching the bottom is instead 2.6 m/s, how much work did the friction do on her