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Two identical blocks of mass 4kg are on a frictionless surface, one stationary, and the other...

Two identical blocks of mass 4kg are on a frictionless surface, one stationary, and the other moves towards it at a speed of 4m/s. Afterwards, the previously moving block moves in its same direction but with 1m/s. How much kinetic energy is "lost" in this collision? _____J

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