Problem with the right function Choosing dimension

Hi, I dont undersand how I am going to do this. Which function shall I use and so forth.

I want the cell to check for the right dimension so that V(m/s) dont go above 0,2 m/s. And if possible choose the dimension closest to 0,2<.

I've started with IF(E7;0,2< what is missing? or how do I need to think?

Anyone got a clue?

cheers

//Simon