Question

An object moves along the x-axis directly from x1 = –12 cm to x2 = +12 cm, where it changes direction abruptly and moves directly to x3 = +6 cm, all in 10 s.
what is the average speed of the object?

Answer 1

The average speed is the total distance covered over total time:

$$s=\frac DT=\frac{12+12+6}{10}=3\text{ m/s}.$$