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quynhanh305
2 năm trước
Câu 2. Một viên đạn đang bay ngang với vận tốc 300m/s thì nổ thành hai mảnh. Mảnh thứ nhất có khối lượng 5kg bay theo phương thẳng đứng hướng lên trên với vận tốc m/s; mảnh thứ hai có khối lượng 15kg bay với vận tốc . Xác định phương, chiều và độ lớn .
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