A baby rejoices by crowing and bouncing up and down in her crib. He...

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A baby rejoices by crowing and bouncing up and down in her crib. Her mass is \( 12.5 \mathrm{~kg} \) and the crib
\( \mathrm{P} \) mattress can be modelled as a light spring with force constant \( 4300 \mathrm{Nm}^{-1} \). The baby soon learns to bounce with maximum amplitude and minimum effort by bending her knees at what frequency?
(1) \( 1.95 \mathrm{~Hz} \)
(2) \( 3.95 \mathrm{~Hz} \)
(3) \( 4.95 \mathrm{~Hz} \)
(4) \( 2.95 \mathrm{~Hz} \)
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