A sledge loaded with bricks has a total mass of 18kg and is pulled at a constant speed by the rope.The rope is inclined at 20 degrees above the horizontal, and the sledge moves a distance of 20m on a horizontal surface.The coefficent of kinetic friction between the sledge and surface is .500. (a)What is the tension of the rope? (b)How much work is done by the rope on the sledge? (c)What is the mechanical energy lost due to friction? I keep getting the wrong answer for (a). Havn't gotten to (b) and (c). I tried to get the normal force of the sledge by this formula... m(9.8)-(m(9.8sin20)) I just cant get anywhere with this problem. My teacher cant teach right either.