Google says 5'2"
https://www.google.com/search?sourceid=navclient&aq=&oq=kevin+hart+height&ie=UTF-8&rlz=1T4GGNI_enUS499US500&q=kevin+hart+height&gs_l=hp..0.0l5.0.0.0.11023...........0.AbuOwtt8y0Q
Wikipedia says 5' 4"
I wasn't a fan either, but the idea is for him to win, not aid the other contestants or the home viewer. (And now that I've defended Arthur Chu, I must go lie down).
For the briefest of brief moments, when Prez and Mom of the Year started their video chat, I expected him to say "Hey Hon, it's all going exactly as planned."
Well, if this is the one they were talking about, the correct answer is "What is 14.2 million?"
http://www.nydailynews.com/new-york/oldest-book-u-s-sells-record-14-2m-auction-article-1.1530464