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功是標量,但功有正負,做功的兩個必要因素是力和位移,力是矢量,位移也是矢量,但它們的乘積是標量比如一個力F沿30度方向產生位移S,那麼功就為F*S.我么可以把力分解為水平方向和豎直方向,位移S也分解為水平和豎直方向,...
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