Two identical cars approach each other head-on while traveling at the same speed. What does an observer

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Two identical cars approach each other head-on while traveling at the same speed. What does an observer in the Earth reference frame measure for the speed of the zeromomentum reference frame of this two-car system? Suppose the same cars are traveling in the same direction. Now what does an observer in the Earth reference frame measure for the speed of the zero-momentum reference frame? 

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