Terminal velocity is reached when a falling object is at it's maximum speed.
Initially a falling object accelerates due to it's weight. as it speeds up, the frictional force (air resistance) opposing the motion gets bigger untill the acceleration deduces to zero.
If frictional forces (air resistance) is larger than the object's weight, it will slow down.
Increasing the surface area, or fluid density, will increase the frictional force and therefore decrease the terminal velocity.
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