A High-Speed Test of the Equivalence Principle

It is well known that Newton’s work on mechanics depended in a crucial way the previous observations of Galileo. The key insight Galileo was one can analyze motion bodies using experiments and mathematical equations. One experimental observation roughly emerges from this modern terms two objects different mass are simultaneously released rest allowed to fall under influence gravity through vacuum should hit ground at same time (this essentially what called equivalence principle general relativity). In popular legend, it said tested by dropping balls masses Leaning Tower Pisa showing they time, but historical evidence suggests unlikely as he seems have experimented mostly with rolling down inclined slopes.