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A horizontal spring with spring constant 250 N/mis compressed by 20 cmand then used to launch a 250 gbox across the floor. The coefficient of

A horizontal spring with spring constant 250 N/mis compressed by 20 cmand then used to launch a 250 gbox across the floor. The coefficient of kinetic friction between the box and the floor is 0.23.

What is the box's launch speed? Express your answer with the appropriate units.

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