To get to the top of a hill, a skier of mass 68.0 kg holds on to a rope and is puted up the slope by a motor-driven winch at the top of the hill that winds the rope onto a drum. 30.0 (a) How much work is required to pull the skier 90.0 m along a 30.0 frictionless slope at a constant speed of 2.20 m/s? Express your answer in kJ. (b) What power must the motor deliver to perform this task? Express your answer in kw kw