A dog weighing 10kg is standing on a flatboat so that he is 20m from the shore. The boat weighs 40kg and has uniform mass distribution. The dog walks 8.0m on the boat towards the shore and stops. For this calculation one can assume no friction or drag between the boat and the water. How far is the dog from the shore now?

A) 12.0m B) 13.6m C) 14.0m D)16.8m E)29.8m