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A 2.0 kg box of running shoes slides on a horizontal frictionless table and collides with a 1.0 kg box of ballet slippers initially at rest on the edge of the table, at height h = 0.41 m. The speed of the 2.0 kg box is 4.4 m/s just before the collision. If the two boxes stick together because of packing tape on their sides, what is their kinetic energy just before they strike the floor?

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