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# A baby bounces up and down in her crib. Her mass is 12.0 kg, and the crib mattress can be modeled as a light spring with force constant 680 N/m.

A baby bounces up and down in her crib. Her mass is 12.0 kg, and the crib mattress can be modeled as a light spring with force constant 680 N/m.
(a) The baby soon learns to bounce with maximum amplitude and minimum effort by bending her knees at what frequency?
Enter a number.1 Hz

(b) If she were to use the mattress as a trampoline—losing contact with it for part of each cycle—what minimum amplitude of oscillation does she require?
Enter a number.2 cm

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