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tranthanh
2 năm trước
một xe đạp đang đi với vận tốc 2m/s thì xuống dốc, chuyển động nhanh dần đều với gia tốc 0,2m/s2. cùng lúc đó một ô tô đang chạy với vận tốc 20m/s thì lên dốc, chuyển động chậm dần đều với gia tốc 0,4m/s2. a) xác định vị trí 2 xe đi ngang qua nhau. biết chiều dài của dốc là 570m. b) xác định vận tốc của 2 xe khi chúng ngang nhau
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