So, there is no added mass force. This is what we have explained to you and one of the reasons, why in say ship resistance, in a if you were to plot here resistance from 0 speed say speed goes like that, this is v, resistance you will find out going like that and going like that. Why this hump is there, because remember at this point it is accelerating, before it reaches steady state and because it accelerates the net force becomes slightly more, which of course will diminish when you reach a steady state. This is a say force or resistance whatever, with respect to time.