Final answer:
The average angular acceleration (αav-z) for the given time interval is 8.312 rad/s².
Step-by-step explanation:
The average angular acceleration (αav-z) can be calculated by using the formula:
αav-z = (γ*t + 0.5*β*t^2) / t
Substituting the given values, we get:
αav-z = (5.45*2.9 + 0.5*0.770*(2.9)^2) / 2.9
Simplifying the expression gives us αav-z = 8.312 rad/s².