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trangcp026
2 năm trước
Giúp mình câu này vs ạ Hai toa xe dài 20m chạy cùng chiều dòng sông trên 2 đường sắt với vận tốc lần lượt là v1=10m/s; v2=72km/h. Hỏi người quan sát ngồi trên xe 1 thấy xe đi qua mặt mình trong bao lâu? Mong mn giải chi tiết ạ
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