Novice piano movers have pushed a 1000 kg piano to a second-story window.  They plan to open the window, then lower the piano 3.0 m into their truck.  They pile up 500 kg of furniture, tie a rope between the piano and the furniture, and place the rope over a pulley.  They then push the piano out the window.  What is the piano's speed when it hits the truck?  The coefficient of kinetic friction between the furniture and the floor is 0.50.

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