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linhka2003301
2 năm trước
Một người dùng ròng rọc để vận chuyển một bao cát khối lượng 20kg lên cao 4m. Biết người đó cần dung một lực 200N, hỏi người đó dùng ròng rọc loại nào? Tính chiều dài dây kéo của ròng rọc?
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