An electric motor is used to lift an elevator and its load (total mass 1500kg)
Channel: Doubtnut
Date: 2020-07-26

An electric motor is used to lift an elevator and its load (total mass 1500kg) to a height of 20m. The time taken for the job is 20s. What work is done ? What is the rate at which work is done. If efficiency of the motor is  `75%`, at which rate is the energy supplied to the motor?