nejnimpetu fu'ivla

x1 is the linear-momentum-energy-mass [four-vector] of x2 in frame of reference x3

Be careful to define the order and units of the four vector. See also: nejni, impetu, ocnerta, tcelerita.


In notes:

impetu
x1 is the momentum [vector] of x2 in frame of reference x3
ocnerta
x1 is a physically-required conserved quantity in an ideal closed system such that it is associated with (Noetherian) symmetry/Hamiltonian-commuting observable/deterministic feature/law/property/aspect x2, applicable under conditions/in universe/in metaphysics x3
sirmpetu
x1 is the [probably spatial] linear momentum [vector] of x2 in frame of reference x3