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Motion is always described in relation to some other point, which is considered to be a fixed point.

For example, if you are at the window of a moving train with your hat in your hand and you pass a man on the platform, you do not see the hat as moving because you consider yourself to be a fixed point, and the hat's position compared to yours does not change. However, the man on the platform sees himself as the fixed point, and compared to him, the train, you and your hat are all moving.

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12y ago

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