The drive propeller of a ship starts from rest and accelerates at 2.38 x 10-3 rad/s2 for 2.38 x 103 s. for the next 1.22 x 103 s the propeller rotates at a constant angular speed. then it decelerates at 2.48 x 10-3 rad/s2 until it slows (without reversing direction) to an angular speed of 2.89 rad/s. find the total angular displacement of the propeller.