certainty relations, hep-th/9706031, Phys.Atom.Nuc1.61:1811-1815,1998, Yad.Fiz.61:1925-1929,1998. [18] V. S. Rychkov, Observers and Measurements in Noncommutative Spacetinres, arXiv:hep- th/0305187, JCAP 0307 (2003) 006 [19] K-I Tezuka, Uncertainty of Velocity in kappa-Minkowski Spacetime, arXiv:hep-th/0302126. [20] J. G