I have some questions about black holes (BH) for which I don't find until now any answer in what I read. I appreciate all answers. 1. When an observer that is out of BH influence are measure time elapse on a falling object he observe a "time dilatation" effect. What I don't understood is if that effect is asymptotically with event horizon (EH) BH or with its singularity. I mean, for the observer the falling object will be always visible or it will eventually disappear "beyond" EH? 2. The mass of BH is increasing just with rest mass of falling matter or the total kinetic energy of falling matter is added too? We can think that for an external observer in fact a collision never happen, so the kinetic energy can't be transferred to BH.