Gymnast's Floor Routine: Angular Velocity & Time

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A gymnast's floor routine involves a tumbling run where she increases her angular velocity from 3.00 to 4.65 revolutions per second while completing half a revolution. To calculate the time taken for this maneuver, one must apply kinematic equations relevant to rotational motion. The term "one-half of a revolution" corresponds to an angle of 180 degrees or π radians. Understanding this angle is crucial for determining the time required for the gymnast's spin. The discussion emphasizes the importance of kinematic principles in solving problems related to angular motion.
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A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.65 rev/s while rotating through one-half of a revolution. How much time does this maneuver take?

ok I understand that I am going to be using one of the equations of kinematics for rotational and linear motion. I just don't understand what I am suspose to use the "one-half of a revolution" for.
 
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What angle is one half of a revolution?
 

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