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(1)
v=v0-gt
0=14.7-9.8t
t=14.7/9.8=

(2)最高点までの時間と、最高点から地面までの時間は同じ
速さも同じで向きが下向き

ましゅまろ

ありがとうございます🙇‍♀️

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