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tanghan145
2 năm trước
cho mình hỏi là nếu kéo một vật 3kg bằng lực kéo từ dưới lên, kéo bằng ròn rọc cố định, bằng ròng rọc động, mặt phẳng nghiêng với đòn bẩy và kéo lên cao 9m thì sẽ có công bao nhiêu?
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