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A spring with a spring constant of 1200 N/m has a 55-gball at its end. The...

A spring with a spring constant of 1200 N/m has a 55-gball at its end. The energy of the system is 3.0 J . Max speed of the ball is 10 m/s. What is the speed when the ball is at a position x=+A/2?

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