[WildTurkey]

assuming air resistance is not a factor, the 10"lb" weight would hit the ground sooner than the 2"lb" weight by an immeasurably infinitessimal amount of time, as the gravity constant is actually a sum of those of the masses in question (earth's and that of the object)

Then, five, two-pound weights tied together would fall faster than one two-pound weight .... hmmmm

[King Prout]

very, very slightly.
not enough to measure by any method available to science at this time.

it is, like the chemistry error you corrected for me, a matter of convenient shorthand: the Earth's mass (and, thus, gravity, is so disproportionately huge that the difference between the gravitic acceleration of a 1kg mass vs. a 5kg mass is so small it cannot be measured directly.