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A 18-g bullet is fired into a 1100-g block of wood which is suspended as a ballistic pendulum. The combined mass swings up to a

 A 18-g bullet is fired into a 1100-g block of wood which is suspended as a ballistic pendulum. The combined mass swings up to a height of 6.8 cm above where it originally was. What was the kinetic energy of the combined mass immediately after the collision?

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