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100[㎞/h]=100000[m/h]=(100000/3600)[m/s]=(250/9)[m/s]

 (250/9)[m/s]×0.5[s]=(125/9)[m]=13.88…[m]

 ②14m が適当だと思われます

︎︎︎ ︎︎︎︎︎

ありがとうございます!!

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