A baby rejoices in the day by crowing and jumping up and down in her crib....

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A baby rejoices in the day by crowing and jumping up and down in her crib....

A baby rejoices in the day by crowing and jumping up and down in her crib. Her mass is 12.5 kg, and the crib mattress can be modeled as a light spring with a force constant of 4.30 kN/m. The baby soon learns to bounce with maximum amplitude and minimum eﬀort by bending her knees at what frequency?

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A baby rejoices in the day by crowing and jumping up and down in her crib....

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