Respuesta :

kafleshristi2005

Answer:

It means that 80% of our effort is converted to useful whereas 20% of our effort is wasted to overcome frictional and gravitational force.

sanjanagautam

Answer:

It means that the total energy produced by the machine is 80 percent and remaining 20 percent is wasted in the term of heat deu to friction.

Hope it is helpful !

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