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thanh11a9thptxm
2 năm trước
Hai vật chuyển động thẳng đều trên 2 đường thẳng x'Ox và y'Oy vuông góc tại O. Cùng 1 lúc, vật 1 đi qua A cách O 9m đi về O trên đường thẳng x'Ox với vận tốc 5m/s, vật 2 qua B cách O 8m hướng về O trên đường thẳng y'Oy với vận tốc 4m/s. Hỏi sau bao lâu khi cùng qua A và B, 2 vật cách nhau 20m?
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