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22. A 5.20 kg block sliding at 9.40 rm's across a horizontal frictionless surface collides head on with a stationary 8.60 kg block. The 5.20

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22. A 5.20 kg block sliding at 9.40 rm's across a horizontal frictionless surface collides head on with a stationary 8.60 kg block. The 5.20 kg block rebounds at 1.80 rm's. How much kinetic energy islost during this collision? [A 1' marks, C 2 marks]

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