A 66kg skier starts from rest at the top of a 1200 m long trail which drops a total of 230m from top

A 66kg skier starts from rest at the top of a 1200 m long trail which drops a total of 230m from top to bottom. At the bottom, the skier is moving 11m/s. 1. how much energy was dissipated by friction? What are the physical properties (including formula weight, melting point and water solubility) and hazards associated with alum, KAI(SO4)2 * 12H20