(adsbygoogle = window.adsbygoogle || []).push({}); A particle of massmmoves in a center of mass frame of reference with a momentump=2m. The center of mass moves with a speedvalong the axis in the frame of reference of the laboratory. What's the angle of the particle in the frame of reference of the laboratory.

What i think I have to do is to calculate the speed of the particle in the laboratory frame of reference, than it is just a simple trigonometric calculation. But I don't really know how to do this.

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# A question in special relativity

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