Help with Falling

I am starting my “realistic” project. I am trying to achieve realistic falling, but whenever I use, it will work even if I just jump and start falling. Is it possible to fix this in any way? I just want it to happen when I fall from tall building. Let me know if you need any more info. The UI for showing velocity shows “1.9536299078027e-05”

-- c is defined here using characteradded event 
if c.HumanoidRootPart.Velocity.Y >= -50 and c:FindFirstChild("ForceField") == nil and c.Humanoid.PlatformStand == false and c.Humanoid:GetState() == Enum.HumanoidStateType.Freefall then

Change the “-50” to just 50, and see if it works then