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## Homework Statement

At t1 = 3.00 s, the acceleration of a particle moving at constant speed in counterclockwise circular motion is

a

_{1}=(6m/s

^{2})i+(5m/s

^{2})j

At t2 = 4.00 s (less than one period later), the acceleration is

a

_{2}=(5m/s

^{2})i-(6m/s

^{2})j

The period is more than 1.00 s. What is the radius of the circle?

## Homework Equations

T= (2∏r)/v

a=v

^{2}/r

## The Attempt at a Solution

I drew out the vectors, but that's all I could do with the problem. Maybe I'm supposed to integrate to find velocity or something? I just really don't understand where to start. If I knew that, I could probably finish it up. But there's so much information given in the book for circular motion, I don't know what to do with it.