Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be [given K=9x109 constant,  Z = 2 and h (Planck's Constant) =6.6×10-34 J s

Energy of electron in He+ 3rd orbit E3=-13.6×Z2n2eV=-13.6×49eV       =-13.6×49×1.6×10-19 J≃9.7×10-19 JAs per Bohr's model,Kinetic energy of electron in the 3rd orbit = - E3∴  9.7×10-19=12mev2v=2×9.7×10-199.1×10-31=1.46×106 m s-1