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the two kilograms object would be first to reach the ground because it has more mass so the gravitational force would be more on it so it is first to fall down.  

hope so my answer is useful
Both Objects will reach the ground at same time.
Galileo demonstrated this in  Leaning Tower of Pisa experiment.
Galileo dropped 2 objects of different masses from the Leaning Tower of Pisa Tower to show that their time of fall was independent of their mass.
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Probably you have not seen what i have written.......