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In a stationary railway compartment, the...

In a stationary railway compartment, there are several passengers. If they start moving in the compartment, will `CM` of the compartment change ? Will the `CM` of the system of compartment and passengers change ?

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The position of `CM` of the compartment will change as the passengers are extermal bodies for the compartment.
However, the position of `CM` of the system (compartment + passengers) will not change as no external force is acting on the system.
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