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## Main Question or Discussion Point

**center of mass velocity greater than 1c???**

Basically I have two electrons moving in opposite directions towards each other.

One is moving 2.5x10^8 m/s and the other is 2.0x10^8 m/s and I'm trying to use the

following equation for finding the center of mass velocity:

V_cm = ((p1 + p2)c^2)/(E1 + E2)

I calculated the momentum's and energies to be,

p1 = 456280 eV/c

p2 = 769846 eV/c

E1 = 174216 eV

E2 = 413132 eV

and the V_cm = 2.08756 c?

Is that supposed to happen, shouldn't it be less than 1?