qspec.p_v  (  v ,  m ,  relativistic = True  )[source]

The momentum $p = \gamma(v)mv$.

Parameters:

varray_like

The velocity $v$ of a body (m/s).

marray_like

The mass $m$ of the body (u).

relativisticbool

The calculation is performed either relativistically (True) or classically (False). The default is True.

Returns:

pndarray

The momentum $p$ of a body with velocity v and mass m (u m/s).