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Generally speaking, your answer should always follow SI units (meters, grams, etc.) unless it is specified to be converted to other units. Even then, you should be converting anything that is not the correct SI units, and then converting to the specified units (Angstrom, kg, nm, etc.) at the very end once you find your answers.
I think it's best to convert it to meters, so it is consistent with units of velocity (m/s) and momentum (kg*m/s) and you don't make mistakes when calculating the final answer. Then, if the problem asks you to give your final answer in nm, just convert it. Hope it helps :)
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