A man weighing 60 kg lifts a body of mass 15 kg to the top of a building 10 m high in 3…

Physics · JEE Main · NTA ExamsWork, Energy and Power

A man weighing 60 kg lifts a body of mass 15 kg to the top of a building 10 m high in 3 minutes. His efficiency is
  1. 20%
  2. 10%
  3. 30%
  4. 40%

Answer

(A) 20%

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