For a single movable pulley, the mechanical advantage is 2, the velocity ratio is also 2, and efficiency is less than 100% due to friction and weight of the pulley. This is a standard ICSE question, beta.
But in my life, I see our old office fan, its pulley system squeaking with dust. The theory says MA is 2, but if the rope is worn or the pulley rusted, the real 'advantage' feels much less. So while the answer is 2, my experience says the efficiency it asks for is more a hope from the textbook.
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