谢指正

来源: 不可复识 于 2011-11-27 13:27:59 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (147 bytes)

Sorry for the mistake.

Yes, take the derivative, gt = v. Therefore, the height should be 15 meters and not 30 meters.

 

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