A person pulls on a 9.4 kg crate as it slides across a level floor with coefficient of kinetic friction 0.5 using a rope attached to the center of the crate. The crate began with a speed of 1.9 m/s and speeded up to 2.4 m/s while being pulled a horizontal distance of 2.0 meters. What is the net change in the kinetic energy in J of this crate during that period?

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