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MMLU / The suspension cable of a 1,000 kg elevator snaps, sending the elevator moving…

Problem

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question

The suspension cable of a 1,000 kg elevator snaps, sending the elevator moving downward through its shaft. The emergency brakes of the elevator stop the elevator shortly before it reaches the bottom of the shaft. If the elevator fell a distance of 100 m starting from rest, the heat that the brakes must dissipate to bring the elevator safely to rest is

choices

  1. 100 J
  2. 1,000 J
  3. 10,000 J
  4. 1,000,000 J

subject

college_physics

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