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What did Galileo discover when he dropped two cannon balls of different weights from the Leaning Tower of Pisa?
A.The force acting on both of the balls was the same.
B.The time for both of the balls to reach the ground was the same.
C.A mass-dependent attractive force was exerted by Earth on the two balls.
D.Gravity pulls everything downward.
E.The balls exerted an attractive force between each other as they fell.
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Answer:

B. The time for both of the balls to reach the ground was the same.

Explanation:

Galileo showed that objects fall at the same time regardless of their weight, it is a matter of their resistance to air that arrives or not before. In a system where there is no air and therefore no friction, the objects fall at the same time and that has been demonstrated many times.

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