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仕事率の前に仕事は求められますか?
 (1)質量25kgのトランクを水平方向に20Nの力で引いて、力の向きに10m動かすときにした仕事は?
 (2)高さ9.0mのタンクに水6.0×10³kgをくみ上げるときにした仕事は?

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