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straight course 16.1 feet per minute, and
that the force acting on a stone or an ap-
ple follows the same law as the force acting
upon the heavenly bodies.[3]
The universality claimed for the law–if
not by Newton, at least by his commentators–
was bold, and warranted only by the large
number of cases in which Newton had found
it to apply. Its universality has been under
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