what do I get here y u v etcetera equal to u minus u1 dy by du plus vdy by dv plus you get also this psi dot dy by d psi dot plus we will of course, this also we will now neglect later on let me write in the other page no because her this v dot let me I’ll go back to the next page the same thing. See the first term is 0 this term is y because initially now this is this initially you see I am having this ship going on a straight line with only u equal to u1 and everything else 0 now when the hull is going on a straight line what is the force coming in this side what is the moment coming this side 0 so the initial condition of y is 0 what we are doing here you know is if you look at that this y I’ll before I write that I’ll show this thing y initially y was 0 this point that is at u equal to u1 and all other is 0 all else 0 my y is here .