An object moves with constant acceleration 4.20 m/s2 and over a time interval reaches a final velocity of 12.6 m/s. (a) If its initial velocity is 6.3 m/s, what is its displacement during the time interval? m (b) What is the distance it travels during this interval? m (c) If its initial velocity is -6.3 m/s, what is its displacement during the time interval? m (d) What is the total distance it travels during the interval in part (c)?