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baoziht2003
2 năm trước
Một ng đi xe đạp lên dốc dài 50m, chuyển đọng chậm dần đều. Vận tốc lúc bắt đầu lên dốc là 18km/h và vận tốc lúc cuối dốc là 3m/s. Tính gia tốc và thời gian lên dốc của người đó
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