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**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?