Answer:
Step-by-step explanation:
i) A; 20 m/s
B: 40 m/s
C: 0 m/s
ii) 40 s - 20 s = 20 s, meaning the vehicle traveled at the uniform velocity of 40m/s for 20 sec (which is where the graph is flat)
iii) a = Δv / Δt = (0-40) / (60 - 40) = -40/20 = -2 m/s²
The acceleration, in this case negative (slowing down), is the slope of the line from C to D.