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Tuyetloga
2 năm trước
Đạn khối lượng 2 kg bay theo phương ngang với vận tốc 300 m/s thì nổ làm hai mảnh có khối lượng bằng nhau mảnh 1 bay với vận tốc v1 = 300 m/s hợp với phương ban đầu của viên đạn góc 60°. Mảnh kia bay với vận tốc là ?
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