Yup. Although I would add a colon after 'is', to give greater clarity.
June 24, 2019
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When used in physics, "mass" is uncountable so you would not make it plural even it refers tothe mass of more than one thing.
http://learnersdictionary.com/definition/mass
[noncount] physics : the quantity of matter in something
a star's mass
June 24, 2019
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