The acceleration of the ball can be calculated using the formula:
acceleration = (change in velocity) / time
In this case, the change in velocity is:
30 meters/second - 20 meters/second = 10 meters/second
The time interval is:
2.0 seconds
So, the acceleration is:
10 meters/second / 2.0 seconds = 5 meters/second^2
Therefore, the acceleration of the ball is 5 meters/second^2.