Galileo in 15th century, discovered that any object falling to earth, fall at the same rate of time . He mentioned that a cannonball and a feather, if dropped from the same height will touch the ground at the same time provided there is no air resistance. He had difficulty explaining it for quite a long time.
4 centuries later with the current Technology it has been experimentally demonstrated.
This is indeed a real manifestation of what Galileo said and we studied in Physics. Without air resistance, the two things arrived at the same time.
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