A boy is sitting in a train looking out the window at another train a few feet away. Both trains havestopped at a station. Slowly, one of the trains starts to move, but the boy cannot tell if it is his trainor the other one. What can he do to tell which train is moving?
Question
A boy is sitting in a train looking out the window at another train a few feet away. Both trains havestopped at a station. Slowly, one of the trains starts to move, but the boy cannot tell if it is his trainor the other one. What can he do to tell which train is moving?
Solution
The boy can look at something stationary like a building, a tree, or a lamp post in the distance. If his train is the one moving, these stationary objects will appear to be moving in the opposite direction. If the other train is moving, these objects will appear to be stationary.
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