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tichthuong123
2 năm trước
Một ô tô có khối lượng m = 2 tấn, chuyển động đều trên mặt phẳng ngang. Biết hệ số ma sát lăn k = 0,02. Lực phát động của ô tô là A. 200N B. 400N C. 2000N D. 4000N
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