A wind turbine in a wind farm is being shut down for maintenance. It takes 40 s for the turbine to go from its operating angular velocity to a complete stop in which the angular velocity function is ω(t) = [(ts−1 −40.0)²/100.0]rad/s . If the turbine is rotating counterclockwise looking into the page. What is the instantaneous angular acceleration at t = 5.00 s?