Answer
0.57 cm/s. No.
Work Step by Step
The average velocity is the displacement divided by the elapsed time.
$$\frac{8.5 cm – 4.8 cm}{4.5 s – (-2 s)} = 0.57 \frac{cm}{s}$$
We cannot find the average speed, because we’d need the distance traveled between the two times, and that is unknown.
