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20cm long spring is used in a tug-of-war. Two people pull on each end with a...

20cm long spring is used in a tug-of-war. Two people pull on each end with a force of 100N. Initially 20cm long spring with k=5000N/m. How long is the stretched spring?What is the work done by the spring?How much work is done if the spring is released?How much potential energy does the stretched and un-stretched spring have?

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