Hello, i have problem with an homework about relativity. i wonder if anyone here could help me solving this assignment below or help me to find any good formulas?(adsbygoogle = window.adsbygoogle || []).push({});

Two particles each with the mass m are moving with the speed v toward each other. They collide and coalesce to one bigger particle. The new mass of the particle is now 3,0m. Determine v.

Grateful for respons :)

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# Relativity mass

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