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part 1 of 2 A neutron in a reactor makes an elastic head-on collision with the nucleus of an atom initially at rest. Assume: The mass of the atomic nucleus is about 13.7 the mass of the neutron. What fraction of the neutron's kinetic en- ergy is transferred to the atomic nucleus? part 2 of 2 If the initial kinetic energy of the neutron is 8.06 x 10-13 J, find its final kinetic energy. Answer in units of J. Answer in units of J​