A Delta baryon is an excitation of a proton with mass 1232MeV/c². It decays to a proton (938MeV/c³) and a neutral pion (135MeV/c²). Assume the Delta baryon has 200MeV of kinetic energy with momemtum parallel to the x-direction. If the pion decays with momentum antiparallel to the x-axis, what is the momentum of the pion? How far will the pion travel bebore decaying? The lifetime of the pion is 8.5×10−¹⁷ s