Answer:
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)
Step-by-step explanation:
