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Alright, since there is no friction i know the center of mass between the dog and boat stays the same. So i tried setting the center of mass in the beginning equal to the center of mass at the end. However for the equation i need to know the mass of each which i have and their distance from some point(i chose the shore). Using the shore i could get the distance the dog started at 20 ft. Not sure on the rest though. Any help is appreciated.