An escalator is needed to carry 75 passengers per minute a vertical distance of 8.0 m. Assume that the mass of each passenger is 70 kg.
(a) What is the power (in kW) of the motor needed?
(b) Express this power in horsepower.
(c) What is the power (in kW) of the motor needed if 35% of the power is lost to friction and other losses?