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The large metal projectiles were dropped off the; leaning tower of Pisa
Between the year 1589 and 1592, there was an Italian scientist named Galileo Galilei who was a professor of mathematics at the University of Pisa.
Galileo performed an experiment by dropping two spheres of different masses from the leaning Tower of Pisa. This experiment was used to demonstrate that the times of descent of both sphere's was independent of their mass.
He discovered that the objects fell with the same acceleration.
In conclusion, the large metal projectiles were dropped off the leaning tower of Pisa.
Read more about Galileo's experiment at; https://brainly.com/question/2557231