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2 năm trước
Một đoàn tàu đang chạy với tốc độ 40 km/h thì hãm phanh, chuyển động thẳng chậm dần đều để vào ga. Sau 2 phút thì tàu dừng lại ở sân ga. a) Tính gia tốc của đoàn tàu. b) Tính quãng đường mà tàu đi được trong thời gian hãm phanh. không cần giải hãy xác định hệ qui chiếu
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