A skier of mass 64 kg is pulled up a slope by a motor-driven cable. How much work is required to pull him 80 meters up a 30 degree slope (assumed frictionless) at a constant speed of 3.1 meters/second? [answer is to be in joules] Ok, so the equation I am using is W = (Fcos(theta))*delta x I tried using the values above and I've done it over and over and still came up with the same number. W = ((3.1*64)*cos30)*80 = 13745.6 Am I missing something obvious? Thanks in advance for any helpful suggestions.