You know those times when you know you are missing something obvious but can't work out what, or find the answer anywhere, and would prefer to post anonymously so, if someone can tell you, you don't feel embarrassed ? This is one of those times :-( (Must be my age.)
@ 7.06 minutes in...
https://youtu.be/bjVfL8uNkUk
If you have a fraction, in this case meters divided by seconds. And of course both numerator and denominator are to the power of 1. How come, after cubing it the numerator is squared but the denominator is cubed ? Shouldn't they be the same, preferably cubed ?
Taking the rest of the larger equation on trust, it seems it has to be correct or the whole thing doesn't work. But this power difference is foxing me.
(Maybe I can get Ed to delete this after I've read the simple solution to save me further embarrassment.)
Cheers.