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tween them, and directly as the product of
the masses of the two particles .[2]
But Newton did not commit himself to
the law until he had answered that question
about the apple; and the above proposition
now enabled him to deal with the Moon and
the apple. Gravity makes a stone fall 16.1
feet in a second. The moon is 60 times far-
ther from the earth’s centre than the stone,
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