What is the efficiency of a pulley and how do we calculate it?

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Homework Statement


I'm on my last question for my coursework and this is it.

I have managed to find out how to calculate the efficiency of a pulley but not "what is the efficiency of a pulley"

Could someone please help me.


Homework Equations



Efficiency = (Mechanical Advantage / Velocity Ratio) X100%


The Attempt at a Solution

 

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