016 (part 1 of 2) 10.0 points A neutron in a reactor makes an elastic head on collision with the nucleus of an atom ini tially at rest. Assume: The mass of the atomic nucleus is about 11.4 the mass of the neutron. What fraction of the neutron's kinetic en ergy is transferred to the atomic nucleus? 017 (part 2 of 2) 10.0 points If the initial kinetic energy of the neutron is 4.28 X 10_13 J , nd its nal kinetic energy. Answer in units of J