Velocity and Instantaneity

By definition, Velocity and Acceleration is each an average over an interval.  Thus, the problem with either instantaneous V or instantaneous A is not that it is difficult, or even impossible, to measure, it is that it is a meaningless concept.  Ditto for any concept of uniform V or A in which 'uniform' is defined as 'at all instants', as well for that of any other concept derived from them, e. g. Force, Momentum, etc.  In other words, it cannot be asserted with certainty that irregularities that happen to average out do not obtain within an interval.  Thus, the anomaly of the indeterminacies of Quantum Mechanics may not be that they violate Mechanistic Determinism, but that they have been isolated and detected.