A ball is rolling down a hill. At the initial point of measurement, the ball is traveling at 1.3 m/s. After 15 seconds, the ball is measured to be traveling at 4.8 m/s.

What is the acceleration of the ball?
Responses

1.3 m/s²
1.3 m/s²
4.8 m/s²
4.8 m/s²
3.5 m/s²
3.5 m/s²
0.23 m/s²