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Acceleration Due To Gravity

This video really has two parts. The first demonstrates that dropping two different masses (balls) from the same height results in them reaching the ground at the same time. There has to have been some acceleration because the balls were not moving at the moment they were released and we know that if air resistance is not a significant force during the motion of the balls then they will accelerate with a constant acceleration towards the surface of the Earth.

The second part of the video demonstrates what happens if air resistance does have a significant role to play during the motion of the two objects, book and feather.

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