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4. Two balls with masses of 1.80 kg and 5.90 kg travel toward each other at speeds of 9.0 m/s and 4.00 m/s, respectively. If the balls have a head-on inelastic collision and the 1.80-kilogram ball recoils with a speed of 8.00 m/s, how much kinetic energy is lost in the collision?

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