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A bullet strikes a stationary wooden block and gets embedded into it and after which both the bullet and the block move together. Which one

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A bullet strikes a stationary wooden block and gets embedded into it and after which both the bullet and the block move together. Which one of the following is true for the kinetic energy of the system before and after the collision: (hint: E) is the kinetic energy of the system after collision and Ex is the kinetic energy of the system before collision. ) O EK ' EK O EK = EK ONone of the above

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