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A spring is compressed 1.5m by a a 4kg mass, which isn't attached, and the spring...

A spring is compressed 1.5m by a a 4kg mass, which isn't attached, and the spring has a force constant of 300N/m. Assume the surface has no friction

How fast is the mass moving when it returns to equilibrium after release?

How long does it take in seconds for the mass to return to the equilibrium position after release?

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