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こちらのほうが分かりやすいかも

min

W2の方でなぜ20sin60°をひくのですか?

たこ焼き

鉛直方向の力のつり合いより
N+20sin60°=mgですよね。すなわち、N=mg-20sin60°
分からなければ質問してください

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