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标题: What is your speed [打印本页]

作者: yma16 时间: 2009-8-28 23:03
标题: What is your speed

when you run on an escalator relative to the distance in the building (3 dimensions)? Is it equal to your speed relative to the escalator plus the escalator speed or less than that? Ignore the air.

作者: ...... 时间: 2009-8-31 06:07
标题: 回复：What is your speed

why not?

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