A load of 50 kg is raised a vertical distance of 15 m in 125 s by a motor.
a. a** Estimate the power necessary for this.
b. b** The power supplied by the motor is 80 W. Calculate the efficiency of the motor.
c. c** The same motor is now used to raise a load of 100 kg the same distance. The efficiency remains the same. Estimate how long this would take.