Assertion: newton's action | /r/HasProperty | corollary 4
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Source sentences:
text: In the early stages of his work on the Principia Newton had identified three logically equivalent alternatives for the third law: the action-reaction principle he ultimately chose, the principle we call conservation of linear momentum (Corollary 3 in the Principia), and the principle that “the common center of gravity of two or more bodies does not change its state whether of motion or of rest as a result of the actions of the bodies upon one another” (Corollary 4).