- #1

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## Homework Statement

*At time t, a comet has the position R = (t*

^{2}-1)i + 2tjAt t = 2, find the radial and circumferential components of velocity and acceleration

## Homework Equations

V

_{r}= V * U

_{r}

V

_{θ}= V * U

_{θ}

a

_{r}= a * U

_{r}

a

_{θ}= a * U

_{θ}

U

_{r}= cosθ i + sinθ j

U

_{θ}= -sinθ i + cosθ j

## The Attempt at a Solution

I've found

v = 2ti + 2j

a= 2i

However, am I allowed to use these equations when the position vector is a function of t and not a function of θ? I'm not very good at polar coordinates so I'm really not sure if I can apply the above equations to my problem right away. Thanks