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Find the total energy at the equilibrium position

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A 0.50-kg mass is attached to a spring with a spring constant of 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position. What is the total energy of the system?

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The solution provides detailed explanation how to find the total energy at the equilibrium position.

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m = 0.5kg
k = 20 N/m
v = 1.5m/s

At the equilibrium place the spring ...

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