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We have this question in our homework. I have the solution, but I don't know how to get to it. So, I was hoping some of you could shed some light on it.

Solution: $$\frac{2\sqrt{2}}{3}c$$

Thanks in advance!

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Welcome to Physics.SE! Our FAQ is written such that we do not answer introductory exercises like this, but instead prefer to address the underling concepts. Can you re-formulate this question to address the general case? Does doing so help you to solve you problem? – dmckee♦ Dec 21 '11 at 19:17
As an aside, you'll find that "relativistic mass" has largely been dropped by people working in particle physics, cosmology and other sub-disciplines that use relativity all the time because it doesn't really add anything. – dmckee♦ Dec 21 '11 at 19:18
Oh. Sorry if I offended anyone by asking. – starship Dec 21 '11 at 19:19
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No one is offended, we just want Physics.SE to be a site about physics and not a homework help site. If you can make the question about physics it can be re-opened and answered. – dmckee♦ Dec 21 '11 at 19:22
Bah! I'll try to reform the question, then. Thanks! – starship Dec 21 '11 at 19:38

closed as off topic by dmckee♦ Dec 21 '11 at 19:17

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