# Chapter 2 - Describing Motion: Kinematics in One Dimension - Problems: 3

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.

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