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(1)
L-Lcos(30°)=L(1ーcos(30°))
(2)
mgL(1-cos(30°))=mv^2/2

taro

(2)は、位置エネルギーがすべて運動エネルギーに変わった

🧡💛

ありがとうございます!
理解出来ました。

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