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một viên đạn có khối lượng 2 kg đang bay thẳng đứng lên cao với vận tốc 200 m trên s thì nổ thành 2 mảnh mảnh thứ nhất có khối lượng 1,5 kg bay với vận tốc 200 m trên giây theo phương hợp với phương đứng góc 60 độ hỏi vận tốc mạnh thứ hai gần nhất với giá trị nào sau đây
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một viên đạn có khối lượng 2 kg đang bay thẳng đứng lên cao với vận tốc 200 m trên s thì nổ thành 2...
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