Solutions to the "new" equation of motion for classical charged particles

Abstract
The "new" equation of motion for classical charged particles proposed by Mo and Papas to include radiation reaction in a second-order equation is shown to reduce to the usual radiation-neglected equation for charged particles moving in straight lines when acted upon by electric fields only. On the basis of our published calculations, we conclude that the Mo and Papas equation gives what intuitively appears to be unphysical results: The kinetic energy of a pair of like-charged particles can be many times larger after collision than before.