Understanding Polar Coordinate Unit Vectors

[Panphobia]

Yea after I wrote the wrong answer, I thought about it and changed it. But the velocity would just be this right? v = 5*(dθ/dt)*Eθ and the acceleration would be 0?

 

[ehild]

Yes, the velocity vector is $$\vec v = 10 \hat e _{\theta}$$ in this case.

The acceleration is the time derivative of the velocity. It is not zero, as the velocity changes direction. You need the derivative of Eθ now. Go back to #20 and figure out how is it related to Er.

ehild

 

[Panphobia]

I only needed the velocity vector in polar coordinate form. Thank you so much for the help!