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## Homework Statement

The problem is here: It is question #4,

http://faculty.mint.ua.edu/~pleclair/ph125/Exams/Ex3/ph125_s09_exam3.pdf [Broken]

## Homework Equations

See Below

## The Attempt at a Solution

I have already gotten the answer and know it is correct:

(2m*vi*d)/(((M,clay)+2m)*R^2)

where m is the mass of the clay

My teacher says that the answer I have written above should have a negative sign in front of it. However, I thought angular speed was defined as the magnitude of angular velocity, meaning it is always positive. Who is correct here?

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