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chanchicute123
2 năm trước
. Hai chiếc tàu thủy, mỗi chiếc có khối lượng 50000 tấn ở cách nhau 1 km. Tính lực hấp dẫn giữa chúng. So sánh lực này với trọng lượng của quả cân 20 g.
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