  Quantized space described by time reversal invariant and rotationally
invariant noncommutative algebra of canonical type is studied. A particle in
uniform field is considered. We find exactly the energy of a particle in
uniform field in the quantized space and its wavefunctions. It is shown that
the motion of the particle in the field direction in time reversal invariant
and rotationally invariant noncommutative space is the same as in the ordinary
space (space with the ordinary commutation relations for operators of
coordinates and operators of momenta). Noncommutativity of coordinates has
influence only on the motion of the particle in the directions perpendicular to
the field direction. Namely, space quantization has effect on the mass of the
particle.
