If we consider the two cars as one system, identify if the system has an external force or not. If it does, identify the external force(s).

No external forces

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Has external forces; external force= collision force and friction

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Has external forces; external force= friction

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None of these

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Solution

The correct option is D Has external forces; external force= friction
The friction between the cars and the road is an external force. Since, for the two car system, the collision between them is internal interaction and hence collision is not an external force here.

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