The velocity of a body moving along the s-axis is ds = 9.81-8. dt i) Find its displacement over the time interval t=4 to t=9 if s = 9 when t=0. ii) Find its displacement over the time interval t=4 tot 9 if s=-3 when t=0. iii) Find its displacement over the time interval t=4 to t=9 if s = so when t=0.