What's the world coming to
when pilots don't know the basics of physics?
s=ut+1/2 at^
^ = squared
s = displacement
u =initial velocity
t = time
a = acceleration
This is the basic physics equation for falling objects where the object size is not considered. There is no mass to take into account, so a mass of 10kg will fall at the same speed as a mass of 40kg, IN EFFECT IF IN A VACUUM! If you take the real world into account and both objects have the same profiles, i.e. two containers of the same dimensions, but one is filled with concrete and the other is empty and both will fall same way down, meaning the empty one won't tumble, the resistance thus terminal velocity will be the same and both will hit the ground at the same time regardless of mass.
When you are considering an object falling in the atmosphere the only determinate when it comes to how fast an object will fall is the area of the object and therefore the drag(resistance) it will produce, mass does not come into it.