posted by Thomas .
You own a yacht which is 14.5 meters long. It is motoring down a canal at 9.80 m/s. Its bow (the front of the boat) is just about to begin passing underneath a bridge that is 30.0 m across. How much time is required until its stern (the end of the boat) is no longer under the bridge?
I will be happy to critique your thinking. You are posting a number of elementary problems with no work or thinking at all. I am not going to do your work.