Answers

①3cmを0.1秒で進む
→1秒で30cm
→30cm/S
②1.5+3+4.5+6=15
→0.4秒で15cm
→4秒で150cm
→1秒で37,5cm
→37.5cm/S

じゃないでしょうか??間違ってたらすみません( ˊᵕˋ ;)💦

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