Explain the coin and feather experiment. what conclusion can be drawn from experiment

In a vacuum, the objects fall at the same rate independent of their respective masses. That means coin and feather both reach the ground at the same time in a vacuum. Larger objects experience more air resistance than smaller objects. Also, the faster an object falls, the more air resistance it encounters.

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the answer is a! (2.9 x 10^-18 j) hope i could someone. : )