Question

How did Galileo prove that different bodies fall towards the earth at the same rate?

Answer 1

1. Galileo took a large transparent tube and created a vacuum in that tube then he climbed the leaning tower of Pisa in the presence of a large gathering. He dropped spheres of different masses into that vacuumed transparent tube.
2. All the spheres reached the surface of the earth at the same time.

Hence he concluded that different masses fall towards the surface of the earth at the same time.