Can you solve these physics riddles? ft Simone Giertz - Part 1/3

Terminal velocity is the velocity that the bodies attain after the air resistance equals their weight (Newton's first law).
When the two spheres attain their terminal velocity, their weights are balanced by the air resistance acting on each of them. Thus the heavier sphere would experience more air resistance after reaching the terminal velocity. 
Proof :
terminal velocity =(2mg/(CpA))^0.5
Since the spheres have same dimensions, (CpA) is same for both of them. 
This means that the terminal velocity of the heavier sphere would be more. Now, 
force of air resistance=(1/2)*(CpA)*(v^2)
Since the heavier sphere has a higher terminal velocity, force of air resistance on the heavier ball is more, once it reaches the terminal velocity.