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As you said that the air is playing the role of resistive force then in vacuum gravitational force should be more effective
I am still confused if the gravitational force only depends on mass and independent of air then why do a massive objects fall down more rapidly in presence of air then much slower in vacuum although the there is no resistive medium in vacuum.
NO As JP said that Lighter objects don't seem to fall because they're so tiny that the air molecules bouncing around is enough to keep them floating.Then if we assume that there is no air just like in vacuum then the tiny particles should come down if the gravity exists
Actually my point of view is that there is no gravity in this world because it fails to explain many things