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1. There is no change in the terminal velocity (which i understand, as at the terminal velocity the acceleration is zero so when solving the equation of motion you are left with the same equation for terminal velocity, not affected by mass).

2. The time it takes the object to reach its terminal velocity increases. This is what I do not understand, I'm almost 100% sure the calculation is correct (I'm doing it in mathcad and checking it via a validated Excel sheet) however I cannot figure out why this happens? It seems counterintuitive that inreasing the mass would result in the object taking longer to reach terminal velocity.

Can anyone shed some light on it? Is it something to do with inertia?