a model rocket launches directly upward with an initial velocity of 28 m/s. what is the velocity of the rocket just before it hits the ground

I have no clue on what to do I am trying my hardest to figure out what to do but this is frustrating I do not know I am trying I'm trying I'm trying I'm trying I'm trying but does it supposed to rain the advocacy try to answer questions have a question on top of questions what I'm trying to do what I can sorry I do not have an answer for you if I could I would give you an answer but I do not have an answer so I do not know hopefully you can find somebody they can figure out the answer for you but I do not know the answer sorry