A skier of mass 76 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 85 m up a 309 slope (assumed frictionless ) at a constant speed of 2.3 m/s? 62563.2 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. kJ (b) What power ( expressed in hp) must a motor have to perform this task? 1692.57 X Your response differs significantly from the correct answer, Rework your solution from the beginning and check each step carefully. hp