Yes... Its not the weight but the force of gravity
No. They will hit the ground at the same time. The inertia for the heavier ball will be greater, but the acceleration for both will be the same, and both would (if the air resistance is the same for both) hit at the same time.
Because the earth is bigger than both so they get pulled down with gravity at the same time
a golf ball obviously...
1.56 seconds
Depends on which one is dropped first. If they are both dropped at the same time, they will both reach the ground at the same time.
They will both hit the ground at the same time.
They should reach the ground together, since their initial vertical speed is the same, namely zero.
On Earth, no. Air resistance would slow the feather way down. However, dropped on somewhere without an atmosphere (like the moon), they would reach the ground at the same time.
Because of gravity, objects fall at 9.7m/s making them reach the ground at the same time. This does not apply to objects like paper or feathers due to the fluid friction in the air.
Yes
There is no reason for the object to change.
It depends plus, you can't go to the top of the leaning tower of Pisa.