Hide Video Speed Rate

Hello all!!!!

I'm having an issue..

I want my students to be able to view the embedded video fullscreen but need to disable the speed rate, so they have to watch it a 1x not 1.75x

I can turn the fullscreen or other properties on or off with javascript like this one

document.getElementsByClassName("mejs-fullscreen-button")[0].style.visibility = "hidden";

But can't seem to find the property that hides this element in the controls.

Any advice?

Thanks!!!

B