Suppose the ski patrol tower at the top of the hill lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.00 slope at constant speed. The coefficient of friction between the sled and snow is 0.100. Note: Assign positive sign to forces in the direction of motion. Express all your answers in J. The figure below shows a diagram of the situation: 60 (a) How much work is done by friction as the sled moves 30.0 m along the hill? E (b) How much work is done by the rope on the sled in this distance? ((3) What is the work done by gravitational force on the sled