The first video showed an astronaut dropping a hammer and a feather on the moon. this video shows how in the absence of air resistance, due to gravity being the same for both of the objects, regardless of the mass they should drop at the same time. They basically reached the surface of the moon at the same time proving this idea.
The second video was showing the same thing, but this time it was comparing the theories of Galileo and Aristotle. Aristotle did not have the same view as Galileo and it seemed at first as if Aristotle was right. However, at the end of the video it was show that Galileo is right. In the absence of air resistance, objects dropped will reach the ground at the same time due to the same force of gravity acting on them. Mass has nothing to do with it.
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