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l:振り子の長さ
赤線 lcosθ
緑線 lーlcosθ=l(1−cosθ)=高さh
弾丸と砂袋の位置エネルギー=(m+M)gh=(m+M)gl(1−cosθ)

理解できました!わかりやすいです!ありがとうございます🙌

taro

よかった

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