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Initially, when a ballerina's arms are extended, she spins at 3.4 rad/sec. Then, her arms are pulled into her body and her moment of inertia becomes 0.61 kg m2. while her angular speed increases to 6.4 rad/sec. Calculate the ballerina's initial moment of inertia. li = kg . m Record your numerical answer below, assuming three significant figures. Remember to include a negative ("-") when necessary