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

The heavier object will experience a higher force of air resistance. 
The gravitational force is greater for the heavier object (F=ma). Both objects travel at terminal velocity. This means the gravitational force (downward) is equal to the force of air resistance (drag, upward). Terminal velocity is the equilibrium of these two forces. 
Because the heavier object experiences a greater gravitational force, this means the force of air resistance must also be greater at terminal velocity.

The force of air resistance is:
F = 1/2 * (air density) * (drag coefficient) * (projected area of the object) * (velocity)^2

As all other things are equal in this example, this greater force can only be achieved by a higher velocity. So the heavier object will have a higher terminal velocity.