To answer the abstract question about what happens after a question is put on hold, I advise you to visit our help center, especially the pages on "closed and on hold questions" and "reopening".
In particular, if a question that is put on-hold is edited, it would be eligible to be placed into the review queue at which point users with the review privilege (earned by accruing sufficient amount of reputation) can vote on whether to re-open the question or not. It is generally advisable to edit the question to address all existing comments, so that when your question is up to review for re-opening, it makes a clear case for itself.
Now, on to your specific question: looking at the timeline for your question, it appears that by the time you asked in the comments about the status the question has already been up for review for re-opening, and the users have voted to leave it closed. This is after you've made the first revision. Evidently the users did not find that your edit sufficiently clarified the question.
Lastly, I am still not entirely clear on what you are asking in the question, but I do have a guess. If my guess is correct, however, your question is about the assumption, implicit in the statement of Newton's second law, that the velocity of a particle is a differentiable function of time. In that case your question would be off topic for this site: questions about formulation of physical laws and their underlying assumptions belong much better on the Physics StackExchange.