A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.00s. At the end of this time, the boatcontinues for an additional 6.00s with an acceleration of +0.518m/s2. Following this, the boat accelerates at -1.49m/s2 for 8.00s.
a) What is the velocity of the boat at t=21.0s?
b) Find the total displacement of the boat.