3番はまずV🟰Vo➖gtを使って鉛直上向きに9.8m/sで投げ上げて鉛直下向きに19.6m/sになるまでの時間を求めてy=Vot➖2分の1じーてぃーにじょう使えば求めれます
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3番はまずV🟰Vo➖gtを使って鉛直上向きに9.8m/sで投げ上げて鉛直下向きに19.6m/sになるまでの時間を求めてy=Vot➖2分の1じーてぃーにじょう使えば求めれます
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