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A man and his shadow

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发表于 2004-11-3 03:49:15 | 显示全部楼层 回帖奖励 |倒序浏览 |阅读模式

A man is walking along a level road lit only by a single streetlight. He is moving in a straight line, at a constant speed. www.ddhw.com

He passes the lamppost and leaves it behind, which makes his shadow lengthen. www.ddhw.com

Does the top of the man's shadow move faster, slower or at the same speed as the man?
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