Q57 / 75 · JEE Main 2020 (07 Jan Shift 2) · Physics

An elevator in a building can carry a maximum of 10 persons, with the average mass of each person being 68 kg . The mass of the elevator itself is 920 kg and it moves with a constant speed of 3 m/s . The frictional force opposing the motion is 6000 N . If the elevator is moving up with its full capacity, the power delivered by the motor to the elevator g=10m/s2 must be at least:

  • A
    56300W
  • B
    62360W
  • C
    48000W
  • Correct answer
    D
    66000W

Solution

Net force on motor will be
Fm=920+6810g+6000
=22000 N
So, required power for motor
Pm=F→m.v→
=22000×3
=66000 watt

Hence, the correct answer is option: 'D'.

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