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## Homework Statement

A.) For the graph above what is the angular displacement during the 4 seconds of motion?

B.) For the graph above what is the angular acceleration from t=2 to t=4?

## Homework Equations

α = at / r

α = ω / t

α = Θ / t^2

ω = Θ / t

ω = v / r

Θ = ω t + 0.5 α t^2

## The Attempt at a Solution

A.) I used ω = Θ / t

rearranged it to ωt = Θ

but my issue is what ω do i use? 0, 10, 20? anything in between? And is this even the right equation to use?

B.) Isn't it not accelerating between t2 and t4? Or is it constant acceleration?

How i went about it is i used α = ω / t

since the time is 2 seconds, and the ω is 20. i got 10, but that was wrong :(