A speedboat starts from rest and accelerates at +2.42 m/s2 for 8.71 s. At the end of this time, the boat continues for an additional 4.33 s with an acceleration of +0.654 m/s2. Following this, the boat accelerates at -1.30 m/s2 for 5.85 s.
(a) What is the velocity of the boat at t = 18.89 s?
(b) Find the total displacement of the boat.