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Newton objected to Leibniz 's equation on the grounds that it allowed for the centrifugal force to have a different value from the centripetal force , arguing on the basis of his third law of motion , that the centrifugal force and the centripetal force must constitute an equal and opposite action-reaction pair .
 Newton, Leibniz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Newton, Leibniz