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