謝指正

來源: 不可複識 於 2011-11-27 13:27:59 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (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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