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In the radioactive decay of a nucleus of an atom called americium-241 (symbol 241Am, mass of 4.03×10^−25kg), it emits an alpha particle? (designated as α) with a mass of 6.68×10^−27kg to the right with a kinetic energy of 8.46×10^−13J . (This is typical of nuclear energies, small on the everyday scale.) The remaining nucleus is neptunium-237 (237Np) and has a mass of 3.96×10^−25kg. Assume the initial nucleus was at rest.

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