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## Homework Statement

A small object with mass 3.55 kg moves counterclockwise with constant speed 1.55 rad/s in a circle of radius 2.70 m centered at the origin. It starts at the point with position vector 2.70 m. Then it undergoes an angular displacement of 8.50 rad.

## Homework Equations

v=ωr

a=rω^2

## The Attempt at a Solution

I've calculated the new position vector of -1.63i + 2.16j and know it's in the second quadrant at 127 degrees but can't get the correct answer of -3.34i + (-2.52)j m/s for it's velocity. The equation I'm using for

**i**is 2.7*sin(127+90) and I'm using 2.7*cos(127+90) for

**j**and neither of these end up and the correct answer. What am I doing wrong?