If the spring is pulled until it stretches 240cm and the


A backpack full of books weighing 51.4N rests on a table in a physics laboratory classroom. A spring with a force constant of 140N/m is attached to the backpack and pulled horizontally.

Part A If the spring is pulled until it stretches 2.40cm and the pack remains at rest, what is the force of friction exerted on the backpack by the table? (N)

Part B Does your answer to part A change if the mass of the backpack is doubled? Explain

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Physics: If the spring is pulled until it stretches 240cm and the
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