A ballistic pendulum is a device for measuring bullet speeds. One of the simplest versions consists of a block of wood hanging from two long cords. (Two cords are used so that the bottom face of the block remains parallel to the floor as the block swings upward.) A 9.7-g bullet is fired into a ballistic pendulum in which the block has an inertia of 4.5 kg, and the block rises 60 mm above its initial position. What is the speed of the bullet just before it hits the block? Express your answer with the appropriate units.

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