a speed boat starts from rest and accelarates at +2.01m/s^2for 7 seconds at the end of this time the boat continues foran additional 6 seconds with an accelaration of +0.518 m/s^2following this the boat accelarates at -1.49m/s^2 for 8seconds
A) find the velocity at 21 seconds?
B) find total displacement of the boat?