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⑴最高点に達した時の速度はv=0だから
0=9.8-9.8t 9.8t=9.8 t=1.0→答え
⑵y=9.8×1.0-1/2×9.8×1.0² y=9.8-4.9 y=4.9→答え
こんな感じでどうでしょうか?分からなかったらまた聞いてくださいね!

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