Answer
a. 3.68 m/s.
b. 0 m/s.
Work Step by Step
a. The definition of average speed is the total distance over the time. The distance traveled is 8(400 m) = 3200 m. The time is (14.5 min)(60 s/min) = 870 s.
$$\frac{3200 m}{870 s} = 3.68 m/s$$
b. The displacement is 0 m.
$$\frac{0 m}{870 s} = 0 m/s$$
