Find the acceleration of the specified object. (Recall that if a variable is changing at a constant rate, its acceleration is zero. A boat is pulled into a dock by means of a winch 15 feet above the deck of the boat. The winch pulls in the rope at a rate of 8 feet per second. Find the acceleration of the boat when there is a total of 17 feet of rope out. Round your answer to 3 decimal places and use a correct label. (6 points)