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

A quick way to find an answer is to understand that when any object reaches its terminal velocity (v), the forces exerting on the object should nullify each other. Hence,
Weight of the object (W) = Upthrust (U) + Air resistance (R)
U is equal on both objects since they have the same volumes.
R = Viscous force exerted by air = 6 × pi × radius of the object (a) × viscosity of air (n) × ter. vel (v)
Therefore, R = W - U = 6(pi)anv
So, it's easily undertood that 'R' and 'v' are higher when the weight (W) of the object is higher.
Conclusion: Heavier the object, greater the resistance it confronts & terminal velocity it achieves. 
PS: That's why ants don't get hurt when they fall from heights. Lesser the terminal velocity, lesser the rate of momentum conversion (force) when the ant hits the flow -> less (no) injury.