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In 12th-century Iraq, Abu’l-Barakāt al-Baghdādī gave an explanation for the gravitational acceleration of falling bodies. He proposed an explanation of the acceleration of falling bodies by the accumulation of successive increments of power with successive increments of velocity. According to Shlomo Pines, al-Baghdādī’s theory of motion was “the oldest negation of Aristotle’s fundamental dynamic law [namely, that a constant force produces a uniform motion], [and is thus an] anticipation in a vague fashion of the fundamental law of classical mechanics [namely, that a force applied continuously produces acceleration]. ” In the 14th century, Jean Buridan and Albert of Saxony referred to Abu’l-Barakat in explaining that the acceleration of a falling body is a result of its increasing impetus.