Whose theorem predicts the motion of an object in free fall?

Galileo Galilei transformed the study of motion in the late 16th and early 17th centuries. Through experiments and analysis, he argued that falling objects accelerate uniformly and that the distance fallen is proportional to the square of time. This overturned the older Aristotelian view that heavier objects fall much faster. Galileo’s work laid important groundwork for classical mechanics and later Newtonian physics.