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Leaning Tower of Pisa

Galileo Galilei experiment using Pisa Tower

1590
Pisa, Italy

Between 1589 and 1592, Galileo Galilei, who lived in Pisa at the time, is said to have dropped two cannonballs of different masses from the tower to demonstrate that their speed of descent was independent of their mass, in keeping with the law of free fall.


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