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(1)初速は0なので、
(力学的エネルギー)=(位置エネルギー)
=mgh
=0.40 × 9.8 ×0.90
=3.528

(2)高さ0より
(力学的エネルギー)=(運動エネルギー)
=mv² / 2
=0.40 × v² / 2
=0.2v²

あいみょん

ありがとうございます!

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