A 50 kg sled is subject to a net force of 20 N pushing in the direction of the sled motion as it is moving over a horizontal surface for a distance of 11 m after having started from rest. At this point the sled is released as it starts down a 10 degree incline. However thesnow is not very deep and the sled stop after having moved an additional 35 m. What is the work done by friction while the sled is on the incline?