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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
國9二段理化牛3定律請高手解題
Nov 8th 2014, 19:21

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1) A u=mgh 2000x2 W=FS 1000x5 2) B 工人出力F所做功=重力做功(這裡等於mgh)+摩擦力做功 所以得摩擦力做功1000 得摩擦力200 有不懂再問ㄅ...
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