Q57 / 75 · JEE Main 2020 (07 Jan Shift 2) · Physics
An elevator in a building can carry a maximum of persons, with the average mass of each person being . The mass of the elevator itself is and it moves with a constant speed of . The frictional force opposing the motion is . If the elevator is moving up with its full capacity, the power delivered by the motor to the elevator must be at least:
- A
- B
- C
- Correct answerD
Solution
Net force on motor will be
So, required power for motor
So, required power for motor
Hence, the correct answer is option: 'D'.