(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Before starting the question, we need to find the displacement vector first.

However, I get stuck here.

I would like to ask(in the solution) how to "noted" that [itex]\hat{r}[/itex]=r[itex]\hat{e}_{\theta}[/itex]?

Can you explain it in detail?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Describing a motion

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