To find the average velocity you need to count the distance and time. In this case, the distance is x2-x1 since the ball move from x1 to x2. The calculation would be: (-4.2cm) - 3.4cm= - 7.6cm.7.
The time would be t2-t1, then the calculation would be: 6.1s - 2s= 4.1s
Then the average velocity is -7.6cm / 4.1s= -1.85cm/s
