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If you are thinking about "free" energy, then that's definitely not a way to achieve it. Although with some types of pulleys you might get half, 1/3, or even less force than the weight you are pulling, you'd be needing to pull the rope, twice, 3 or ever more times. Basically the work is constant to raise a mass at height h, and its $$W = m \cdot g \...


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