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這是作用力於反作用力啊.我們來打個比方,假設現在彈簧秤固定在牆上,你用一隻手去拉,用了10N的力量,彈簧秤上的示數必然是10N,而現在牆面也受到了10N的拉力,對吧?這時你把牆面想像成你的另一隻手就可以了.
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