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thanhton159357
2 năm trước
Câu 1: 1 vật có khối lượng 900kg rơi từ độ cao 50dm xuống đất. Tính công của trọng lực Câu 2: 1 lực sĩ nâng quả tạ 130kg lên cao 25 dm trong thời gian 5 giây. Trong trường hợp này, lực sĩ đã hoạt động với công suất bao nhiêu ?
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