A sledge with bricks has a total mass of 180.0 kg and is pulled at a constant speed by a rope inclined at 20 degrees above the horizongtal. The sledge moves a distance of 20.0 m on a horizontal surface. The coefficient of kinetic friction betweenthe sledge and surface is 0.500. (a) What is the tension in the rope? (b) HOw much work is done by the rope on the sledge? (c) What is the mechanical energy lost due to friction?