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nnq191
2 năm trước
một khúc gỗ có khối lượng m=50kg bị rơi xuống cái rãnh 4 người có nhiệm vụ kéo nó lên nếu lực kéo của mỗi người là 123 Niuton thì 4 người đó có thể kéo trực tiếp khúc gỗ đó lên ko ?
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