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baophuc2607200127
2 năm trước
Một học sinh đi xe dạp xuống một đoạn đường dốc dài 150m.trong 60m đầu tiên HS đó jk hết nửa phút ,đoạn đường còn lại hết 20 giây .tính vận tốc trung bình trên đoạn dốc và trên cả đoạn đường dốc đó? M.n giúp mik vs ạ mjk đg cần gấp Hứa vote 5 sao
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