A movers dolly is used to transport a refrigerator up a, Physics

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A movers dolly is used to transport a refrigerator up a

A mover's dolly is used to transport a refrigerator up a ramp into a house. The refrigerator has a mass of 108 kg. The ramp is 2.10 m long and rises 0.850 m. The mover pulls the dolly with a force of 497 N up the ramp. The dolly and ramp constitute a machine.

(a) What work does the mover do?

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(b) What is the work done on the refrigerator by the machine?

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(c) What is the efficiency of the machine?

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