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lyminhtri21
2 năm trước
Một khẩu súng đại bác nằm ngang có khối lượng 1000kg, bắn một viên đạn khối lượng 2,5kg. Vận tốc viên đạn ra khỏi nòng súng là 600m/s. Tìm vận tốc của súng sau khi bắn.
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