Galilean relativity principle states that the same laws of physics apply in all frames of reference moving at constant speed. Observers in such frames should observe the same physical phenomena.
The principle of relativistic Galilean relativity states that the same laws of physics apply in any frame of reference moving at a constant speed in a straight line. This means that observers in such frames should observe the same physical phenomena. When observing two objects in motion from a train in motion, according to Galilean relativity, the objects will move at a speed relative to each other, not to the train
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