Lúc 6h sáng một ô tô khởi hành đi từ A đến B với vận tốc không đổi v = 36km/h. Lập phương trình chuyển động khi chọn hệ qui chiếu sau: a) Chiều (+): từ A đến B Gốc tọa độ : tại A Gốc thời gian : 6h b) Chiều (+) : từ B đến A Gốc tọa độ : tại A Gốc thời gian : 5h

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