It's also possible that inertia is quantized[1], which further complicates things. There is an experiment launching soon which may offer some evidence either way.<p>[1] <a href="https://physicsfromtheedge.blogspot.com" rel="nofollow noreferrer">https://physicsfromtheedge.blogspot.com</a>
> we conclude that up to 5 per cent of such triples would require an accuracy of smaller than the Planck length in order to produce a time-reversible solution, thus rendering them fundamentally unpredictable.<p>Hence, incidentally, classical physics is itself non-deterministic and non-computable.