In a ballistic pendulum demonstration gone bad a 054g, Ask an Expert

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In a ballistic pendulum demonstration gone bad, a 0.54g pellet, fired horizontally with kinetic energy 3.40J, passes straight through the 400g Styrofoam pendulum block. If the pendulum rises a maximum height of 0.55mm, how much kinetic energy did the pellet have after emerging from the Styrofoam?

K_final= ___J

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