sirmpetu fu'ivla

x1 is the [probably spatial] linear momentum [vector] of x2 in frame of reference x3

Three-vector. Technically, the word only implies a linear momentum; spatialness is perhaps implicit but should be specified in tanru for safety. See also: impetu, nejnimpetu, cnampetu, ocnerta.


In notes:

impetu
x1 is the momentum [vector] of x2 in frame of reference x3
klaisirmpe
x1 measures to be x2 [li; number] kilogram-meters-per-second by standard x3