Perhaps this will help:
Probably not Matt but thank you most kindly for those links
It is for an actual "ideal" pendulum.
Forgive me Matt but that's contradictory
Nah, I sort of know what you mean, just couldn't resist tho
Notice first the velocity arrow does shrink to zero at the peaks.
I should think it would, if "velocity" means how fast something is going
Notice next that the acceleration arrows are never absent (at the peaks), though they change direction.
Yea Matt, I understand that pretty well now, thanks largely to Eng's posting above which you so aptly verify herewith
Yet that creepy feeling, as I described near the end of my response, persists
I hasten to observe that that crossbar does in fact exist in a "practical" case as I've mentioned a couple of times above. But now getting theoretical it's just difficult to imagine, that crossbar has disappeared simply because its duration is zero
Especially after somebody, I forget who, maintained that acceleration precedes change in velocity (though withdrawn then possibly later reinstated, I'm still not sure), suggesting an "infinitesimal" duration at the peak; that is, our "crossbar"
…the second of two "different kinds" of zero
Mind you, I'm not arguing in my favor, only revealing the source of my confusion and the reason for tentatively reasserting my viewpoint
If you want to expand on this even more: Look into the concept of jerk.
At first before opening the link I presumed you meant me
It's not every day……….and thank you again for your immense patience