in output file，I get Px and weight，the particle is electron,can I calculate the velocity by （px/weight/9.01e-31）?

[XnjeMa]

I get px=5.809e-21，weight=1.349e11，particles are electron，the v=0.05m/s, I think it‘s wrong，but I don’t know how to correct it

[Status-Mirror]

I've answered in the discussion, but I'll quickly get you the momentum using these numbers too.

Since you haven't given a $p_y$ or $p_z$, I'll assume they're 0 here (you can output these the same way you output $p_x$).

$p = \sqrt{p_x^2 + p_y^2 + p_z^2}$ = 5.809e-21 kgm/s $E = \sqrt{p^2c^2 + m^2c^4}$ = 1.7e-12 J $v/c= pc/E = 0.9999c$

So, very close to the speed of light.

[Status-Mirror]

I'm going to mark this issue as closed for now, but feel free to re-open if you need further clarification.

Cheers, Stuart