See, the ship was going in this direction, now you have got a disturbance. So, it actually
eventually comes back and begin to go in a straight line, when it goes to a straight line
you have got v dash 0, r dash 0. So, it simply ensures that the ship can go in a finally, it
goes to another straight line only, that is important because it is not positional stability
directional stability, but straight line stability only.
See, the ship was going in this direction, now you have got a disturbance. So, it actuallyeventually comes back and begin to go in a straight line, when it goes to a straight lineyou have got v dash 0, r dash 0. So, it simply ensures that the ship can go in a finally, itgoes to another straight line only, that is important because it is not positional stabilitydirectional stability, but straight line stability only.
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