Một đoàn tàu hỏa rời ga chuyển động thẳng nhanh dần đều. Sau 3 phút tàu đạt tốc độ 54km/h A. Tính gia tốc của đoàn tàu B. Tính quãng đường mà đoàn tàu đi được trong thời gian 3 phút đó C. Nếu tiếp tục tăng tốc như vậy thì sau bao lâu nữa đoàn tàu đạt tốc độ 63km/h

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