It's the mass of the Earth which determines the speed of objects attracted to it, ... which makes any difference in speed which would be caused by the feather or the bowling ball to be observationally negligible.
Comparative mass
Feather .001 gram
Bowling Ball 5000 grams
Earth 6 (with 27 zeroes behind it) grams
6,000,000,000,000,000,000,000,000,000 grams
Yes, .. don't stop, go on, .. Here, let me help you;
Earth 1.317 X 10^25 lbs. = gravity of 9.807 m/s^2
a 16,000 lb. elephant = gravity (g-force) of 0.00,000,000,000,000,000,000,119 m/s^2 (20 zeros behind it)
a feather weighing at .001 gr has a g-force of ; 0,000,000,000,000,000,000,000,000,006 m/s^2 g-force (27 zeros behind it.)
Thus, the elephant should fall way before the feather.
When NASA talks about trigging distances between two planets seen 2" apart from here on earth, which they say are hundreds of Billions of light years away, .. and CERN talking about quantum particles that make up the protons and neutrons of atoms, the difference between the G-force of the elephant and the feather is tremendous, not something "insignificant".
Look at the math, is something
with 7 zeros larger mass "insignificant" to NASA? I think not, unless they are hiding something.
When both dropped in a vacuum at the exact same time 1" apart, the feather after 5.921 (depending on the suns position over your globe) feet of acceleration should be stuck to the elephant. But dropped separately, the elephant, or bowling ball should have fallen first, and I'm sure NASA could have CERN build them a sensor to detect this tremendous difference when speaking in quantum-scales. And this is figured out going by the rules of gravity:
1. Gravity is the "force" that attracts a body to the center of the earth, or ANY other physical body having mass.
2. This means that anything with mass has a gravitational force.
3. Gravity pulls falling objects to the ground.
4. It applies to objects of all sizes, stating that the more mass an object had, the more it attracted other objects.
The
nail-in-the-coffin is that
NASA and Brian Cox (including you Globe-earthers here)
"expected" all mass, no matter what the weight/density;
to drop at the same time. Besides, there is nothing 'insignificant' between masses with 7-zero differences. You want to do the math, well there it is!
I bet you wished you stuck with Algebra, right? G+G=G means all masses/weights drop at the same rate: "G"
I can also tell you at what speed the feather would 'gravitate' to either the Elephant, or the bowling ball, now that I got my son to use his Graphing calculator. Actually, he does it in seconds on paper using Algebra.