A 50,000-kg barge is pulled along a canal at a constant speed of 3 km/h by a heavy tractor. The towrope makes an angle of 18° with the velocity vector of the barge. The tension in the towrope is 1200 N. If the towrope breaks, how far will the barge move before coming to rest? Assume that the drag force between the barge and water is independent of velocity.