And so we know, we know that that velocity (let me do it this way) we know that velocity is equal to displacement is equal to displacement divided by time, it's really once again, it is change in time but we'll just say time, that's implicitly change in time and if you manipulate this a little bit you really just multiply both sides by time you just multiply both sides by the variable 't' you get displacement, cuz this cancels out... ...you get displacement, and I'll flip this around