Friends i need your help pleasee

1. Average velocity in first three seconds:

V = (d3 - d0)/(t3 - t0) = 8/3 = 2.67 (m/s)

2. Displacement from initial position at the end of 13 s: D = -8 (m)

( because from t = 12 to t = 15, displacement is constant and equal to -8)

3. Time after which the body is at the initial position:

t = 8 and t = 17 (according to the graph, at these moments, D = 0)

4. Average velocity after 8 s:

V = (d8 - d0)/(t8 - t0) = 0/8 = 0 (m/s)

Hope this helps!

:)

step-by-step explanation: