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## Homework Statement

I am given this graph and asked to find:

a. the particle's angular velocity at t=1s

b. angular velocity at t=4s

c. angular velocity at t=7s

## Homework Equations

ω = θ/t

## The Attempt at a Solution

I got 0 for a, which is the correct answer. However, I cannot seem to figure out b or c. For c, I got 2π/7 and it is incorrect. I've also tried 2π*radians/T and that doesn't work either. I'm not really sure what to do.