Help please its due by 9 AM

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You are pushing a refrigerator across the floor of your kitchen.You exert a horizontal force of 270 N for6.5 s, during which time the refrigeratormoves a distance of 2.7 m at a constantvelocity.

part a asks what is the total work (by all forces) done on therefrigerator.

part b is what is the work done by friction.

How do I even solve for friction with out being given thecoefficient of friction or the F frictional?  Any suggestionswould be helpful thanks.

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