The efficiency of a lifting machine is the ratio of

  • AOutput to the input
  • BWork done by the machine to the work done on the machine
  • CMechanical advantage to the velocity ratio
  • DAll of the above
Correct Answer : (D)

All of the above

Hints :

The coefficient of friction depends upon


The energy possessed by a body, for doing work by virtue of its position, is called

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