A neutron at rest decays (breaks up) to a proton and an electron. (in reality, this process, called beta decay, is more complex, but we will consider this simple model for now.) energy is released in the decay and appears as kinetic energy of the proton and electron. the mass of a proton is 1836 times the mass of an electron. what fraction of the total energy released goes into the kinetic energy of the proton?