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A backpack full of books weighing 50.0 N rests on a table in a physics laboratory...

A backpack full of books weighing 50.0 N rests on a table in a physics laboratory classroom. A spring with a force constant of 130 N/m is attached to the backpack and pulled horizontally.

If the backpack begins to slide when the spring (k = 130 N/m ) stretches by 2.30 cm , what is the coefficient of static friction between the backpack and the table?

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