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QUESTION
A backpack full of books weighing 58.0 rests on a table in a physics laboratory classroom.
A backpack full of books weighing 58.0 rests on a table in a physics laboratory classroom. A spring with a force constant of 140 is attached to the backpack and pulled horizontally. If the backpack begins to slide when the spring ( = 140 ) stretches by 2.40 , what is the coefficient of static friction between the backpack and the table?
