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If you could use an elevator or the stairs to lift a box to the tenth floor,which has greater power?why?
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If you could use an elevator or the stairs to lift a box to the tenth floor,which has greater power?why?

User Can Rau
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Stairs don't HAVE any power. When you use the stairs, YOU have to provide all the power. I would use the elevator, because the machinery that runs it produces the power and I only have to stand there.
User Oliver Adria
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