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A plane’s propeller has a rotational inertia of 4.0 kgm^2. The propeller initially has a clockwise (-) angular speed of -9.0 rad/s, but has a constant counterclockwise torque of 3.0 Nm applied until the propeller reaches a counterclockwise (+) rotation of +12 rad/s. How much time was the torque applied for?​

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