Simple rigid body free fall results in correct velocity but not distance?

Hi all,

I am having a pretty basic issue that I hope is just a simple mistake on my part. When letting a simple 1m^3 rigidbody block fall, I am finding that the block is not displacing quite fast enough. I am logging the distance from the objects start point, velocity, and corresponding time to the console for every fixed update via script. The logged velocity agrees to three or four decimal places to what you would predict using the classic v2 = v1 + at equation, but the expected distance for that velocity and time are off what you would predict using d = v1 + 1/2 x a x t^2. In this case for example with gravity at -9.81 m/s^2, the velocity at t = 1.7s is 16.67699 m/s and the distance is 14.25883 m. Using the classic kinematic equations you would expect a velocity of 16.677, but a displacement of 14.17545 m. I have no drag applied to the object, so I am curious as to why this value is off about 8 cm over just 1.7 s of free fall. The velocities agree fine, so does this mean Unity is not using the traditional kinematic equation for displacement of an accelerating object?

Any help on this would be much appreciated!