Assume the nucleus of a radon atom, 222Rn, has a mass of 3.68·10-25 kg. This radioactive nucleus decays by emitting an alpha particle with an energy of 8.79·10-13 J. The mass of an alpha particle is 6.65·10-27 kg. Assuming that the radon nucleus was initially at rest, what is the velocity of the nucleus that remains after the decay?
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