Hey im trying to make a body fall in the water and when he is in the water the water stop's a little his velocity thanks to the density of the water.
but i cant find anyway to do that. Anyone knows how to do this?
I really appreciate if you could help me.

Let's start with, how did you setup your scene?
Did you use shelftools and if yes, which shelf tools. How is your body setup (I assume you mean a rigid body)?

Yes its a rigid object. Im new at houdini, and i search for water and bodys responding to the water and i only found using a flip tank for the water and a RBD object, probably im not using the correct thing´s