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.

jbovlaste

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