một viên đạn bay thẳng đứng với vận tốc 250m/s thì nổ thành  2 mảnh có m1=m2 tìm hướng và độ lớn của mảnh thứ 2 bay với vận tốc 500m/s theo phương lệch góc 60 với đường thẳng đứng hướng xuống

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