Simplify the following text for a Grade 9 native English-speaking person.
Original: In his famous ( though possibly apocryphal ) experiment dropping balls from the Tower of Pisa , and later with careful measurements of balls rolling down inclines , Galileo showed that gravitation accelerates all objects at the same rate .
Simplified: He later rolled balls down inclines . With these experiments , Galileo showed that gravitation accelerates all objects at the same rate regardless of weight .