(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 3.000 u (1 u = 931.5 MeV/c2) object moving to the right through a laboratory at

0.8c collides with a 4.000 u object moving to the left through the laboratory at

0.6c. Afterward there are two objects, one of which is a 6.000 u object at rest.

Determine the mass of the other object

2. Relevant equations

CONSERVATION OF ENERGY

[itex]\gamma[/itex]m_{1}c^{2}+[itex]\gamma[/itex]m_{2}c^{2}=[itex]\gamma[/itex]m_{3}c^{2}+[itex]\gamma[/itex]m_{4}c^{2}

3. The attempt at a solution

Each gamma is different because of different speeds but for the purpose of time management and the fact that past this I don't know what to do, I left them as gamma.

[itex]\gamma[/itex]2794.5Mev+[itex]\gamma[/itex]3726MeV=5589Mev+[itex]\gamma[/itex]m_{4}c^{2}

Am I supposed to assume both objects are at rest? Doesn't seem like that would be the case because the other object would just be 1u. Any thoughts anyone?

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# Help with determining other mass of a relativistic collision

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