I need help on this problem, please if someone could look at it and help me out!! Suppose you measured the velocity of an air cart twice as it moves along an air track. At T1= 0.2 Sec the velocity is V1= 0.4 m/s. At T2= 0.6 Sec the velocity is V2= 0.9 m/s. What is the average acceleration of the cart?