A boat is cruising in a straight line at a constant speed of 2.5 m/s when it is shifted to neutral. After coasting for 13m the engine is engaged again, and the boat resumes cruising at a reduced speed of 1.5 m/s.
1) assuming constant acceleration while coasting, how long did it take for the boat to coast 13m?
2) what was the boats acceleration while coasting?