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nabi173109
2 năm trước
một quả đạn có m=2kg đang bay thẳng đứng lên cao với vận tốc 250m/s thì nổ thành hai mảnh bằng nhau. Một mảnh bay với vận tốc 250m/s theo phương ngang . a) hỏi mảnh kia bay theo phương nào, với vận tốc là bao nhiêu? b) xác định vị trí chạm đất của mảnh thứ hai.
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