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Alice and jim calculate that they must do 1,800 j of work to push a piano up a ramp. however, because they must also overcome friction they actually must do 2,400 j of work. what is the efficiency of the map

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AL2006
Alice and Jim will put 2,400 Joules of energy into the situation,
and 1,800 Joules of energy will come out in a useful form.

The efficiency of the whole process will be

      1800 J / 2400 J  =  3/4  or  75% . 

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