If the spring stretches by 2.4cm what is the coefficient of, Ask an Expert

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Q. A backpack full of books weighing 59N rests on a table in a physics laboratory classroom. A spring with a force steady of 150-N/m is attached to the backpack and pulled horizontally, as indicated. If the spring stretches by 2.4cm, what is the coefficient of static friction between the backpack and the table?

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