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tranducdungthcsleloi
2 năm trước
Dùng ròng rọc đông có hiệu suất 80% để kéo vật nặng 60kg lên cao, phải thực hiện 1 công là 7500J. a/ Tính chiều cao đã kéo vật lên. b/ Tính lực kéo ở đầu dây.
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