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

two particles of masses m_{1}and m_{2}move at speeds u_{1}, u_{2}respectively collide and fuse. If α is the angle between the two directions of motion before the collision, find an expression for the new mass m, in terms of m_{1}m_{2}u_{1}u_{2}and α

2. Relevant equations

E_{tot}^{2}= p^{2}c^{2}+m^{2}c^{4}

3. The attempt at a solution

(m_{1}^{2}u_{1}^{2}c^{2}+ m_{1}^{2}c^{4})^{1/2}+ (m_{2}^{2}u_{2}^{2}c^{2}+ m_{2}^{2}c^{4})^{1/2}= mc^{2}

However this does not take into consideration the angle α, so I am unsure as to where this comes in.

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# Four momentum of fused particles

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