Now what happen, the idea is like this, you have given x also, Y was 0, forget x part, I
mean I am just going to talk about these two; let us say these two, because these two are
the one, basically looking into Y direction and the moment, x direction is the force
going. So, let me look at just these two, let us understand the physics behind it, what we
are trying to look at, initially I have Y is 0, v dot is 0, psi dot is 0, so 0 equal to 0, no
problem, no force, no motion.