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**1. Homework Statement**

Particle is moving with velocity

__v__= u

__i__along the line y=2. What is its

__v__in polar coordinates

**2. Homework Equations**

**3. The Attempt at a Solution**

I think I'm being really stupid here but not entirely sure where to start. If you integrate to find position you have it as = ut + c

__i__+ 2

__j__and then in polar coordinates is this

r=[tex]\sqrt{}(ut+c)^2 + 4[/tex]

__r^__? But then if you were to differentiate that the velocity would depend on the initial position which can't be right. I'm obviously doing something wrong and haven't got my head round this topic yet, any help would be appreciated.

**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**