A ball rolls down and travels a distance of 3.00 m in 2.05 seconds. Find (a) what is the balls acceleration?

Use two basic formulas that I'm sure are in your textbook/notes. One is velocity is equal to distance over time and the other is acceleration is equal to velocity over time. I suggest you make a formula sheet of all the formulas you read in your text or go over in class. Having them all in one place really helps, especially as you approach exam time.