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You start with spring that's already been stretched an unknown amount from equilibrium. After stretching it...

You start with spring that's already been stretched an unknown amount from equilibrium. After stretching it an additional 2.5 cm, you find that the total potential energy associated with the spring is 18 J. You stretch it another 2.5 cm, and now the potential energy rises to 25 J.

Find the spring constant.

Find the initial stretch.

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=c) . 5 le (0.2256) 0-5 Cc-2256) o 11 26 62.06

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