Question
Explain how an object could have zero average velocity but non-zero average speed?

Answer

Average velocity, $\text{v}_{\text{av}}=\frac{\text{Net displacement}}{\text{Total time taken}}$
and average speed, $\text{s}_{\text{av}}=\frac{\text{Total distanve travelled}}{\text{Total time taken}}$
If an object moves along a straight line starting from origin and then returns back to origin.
Average velocity = 0
And Average Speed $=\frac{2\text{s}}{\text{t}}$

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