  We consider a rigid body acted upon by two forces, a constant force and the
collective force of interaction with a continuum of particles. We assume that
some of the particles that collide with the body reflect elastically
(specularly), while others reflect probabilistically with some probablility
distribution K. We find that the rate of approach of the body to equilibrium is
O(t^{-3-p}) in three dimensions where p can take any value from 0 to 2,
depending on K.
