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tranngochoa2001
2 năm trước
Câu 4: Tại cùng một thời điểm có 2 xe xuất phát từ 2 điểm A và B cách nhau 60 km, chúng chuyển động cùng chiều từ A đến B. Xe thứ nhất khởi hành từ A với vận tốc v1= 30 km/h. Xe thứ hai khởi hành từ B với vận tốc v2 = 40 km/h ( cả 2 xe đều chuyển động tđ). A) Tính khoảng cách giữa hai xe sau 1 h kể từ lúc xuất phát. B) Sau khi xuất phát được 1 h 30 phút xe thứ 1 đột ngột tăng vận tốc với v1 = 50 km/h . Hãy xác định thời điểm và vị trí 2 xe gặp nhau.
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