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A 250 g object on a frictionless, horizontal lab table is pushed against a spring of force constant 40.0 N/cm and then released. Just before

A 250 g object on a frictionless, horizontal lab table is pushed against a spring of force constant 40.0 N/cm and then released. Just before the object is released, the spring is compressed 14.0 cm . (A)How fast is the object moving when it has gained half of the spring's original stored energy?

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