A cart loaded with bricks has a total mass of 20.4 kg and is pulled at constant speed by a rope. The rope is inclined at 31? above the horizontal and the cart moves 17.4 m on a horizontal ?oor. The coeffcient of kinetic friction between ground and cart is 0.6 . The acceleration of gravity is 9.8 m/s^2. How much work is done on the cart by the rope?