A spring of force constant 285.0 N/mN/m and unstretched length 0.220 mm is stretched by two forces, pulling in opposite directions at opposite ends of the spring, that increase to 19.0 NN. How long will the spring now be? Express your answer in meters. How much work was required to stretch it that distance? Express your answer in joules.

Principles of Physics: A Calculus-Based Text
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Chapter6: Energy Of A System
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A spring of force constant 285.0 N/mN/m and unstretched length 0.220 mm is stretched by two forces, pulling in opposite directions at opposite ends of the spring, that increase to 19.0 NN.

How long will the spring now be?
Express your answer in meters.
How much work was required to stretch it that distance?
Express your answer in joules.
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