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nguyenhavi224
2 năm trước
Ôtô kéo rơ-mooc nặng 1 tấn bằng dây cáp, chạy thẳng đều trên đường ngang. Hệ số ma sát bằng 0,05; cho g = 10m/ . Lực căng của dây cáp là
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