Suppose the ski patrol lowers a rescue sled and victim 30m down a slope at a constant speed as shown below. The victim and sled have a total mass of 90kg. The angle of the slope is 60 degrees. If the coefficient of friction is 0.100. a) Find the work done by friction as the sled moves down the hill. b) how much work is done by the rope on the sled. c) What is the work done by gravitation. d) What is the total work done. Not sure where to start here. Any help with starting would be apprecitated.