Answer:
Explanation:
Assuming the horizontal axis is in seconds, and the vertical axis is meters.
1) v(average) = (p₁ - p₀) / (t₁ - t₀)
v(average) = (7.5 - 20) / (15 - 7) = -1.5625 m/s
2) 6 s ≤ t ≤ 9 s, section B
t = 12 s,
t = 18 s,
21 s ≤ t ≤ 26 s section F
maybe at t = 0 s and t = 29 s, but we're not sure as the position is unknown beyond those limits.
3) at t = 3 the position was 0 or at the origin of the reference frame
4) v(25) = 0 m/s
the slope of the plot is zero at this location on a position in time graph.
