baby bounces Up and down in her crib: Her mass is 11.0 kg and the crib mattress can be modeled as light spring with force constant 514 N/m The baby soon earns to bounce with maximum amplitude and minimum effort by bending her knees at what frequency?
(b) If she were to use the mattress as trampoline- losing contact with it for part of each cycle what minimum amplitude of oscillation does she require?