What experiment of Galileo's involved cannonballs?

Answer 1

Galileo's experiment to show that mass had little effect on the speed of falling objects involved two cannonballs of different sizes being dropped from a certain height. This showed that, in a vacuum at least, falling objects fall at the same speed no matter their mass.

Answer 2

Galileo's experiment involving cannonballs was to demonstrate that objects of different masses fall at the same rate in the absence of air resistance. He dropped objects of different masses from the Leaning Tower of Pisa to show they hit the ground simultaneously, contradicting the prevailing belief that heavier objects fall faster.