I need help with answering the change in velocity

Using the graph below answer the following questions based on the acceleration of a mouse that has an initial velocity of 3.5 m/s forward. Acceleration-versus-time graph 2.5 N 1.5 Acceleration (m/s?) 10 20 30 40 -2 -2.5 Time (s) 15. What is the change in velocity for the segments in the table below: Time Segment Change in Velocity (AV) 0 -5 seconds 5 -15 seconds 15-25 seconds 25 - 35 seconds 35 -40 seconds 40- 45 seconds