Yes, but you've played down the effect of air-resistance. They glasses could potentially hit you with quite a considerable force as the glasses are very light and so will decelerate faster. Just think about chucking something out a car window and how quickly it shoots off backwards. It's just the same.jokerman said:Without turning this topic into another huge physics debate, the goggles should be travelling forwards at the same speed as the train at the time they leave the persons face, and so if they hit the person on the row behind, it won't appear that they are travelling at any great speed.