珍珠湾ART
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.
www.ddhw.com
作者: ...... 时间: 2009-8-31 06:07
标题: 回复:What is your speed
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