(Answered) The springs of an automobile trailer are compressed 1016 cm

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The springs of an automobile trailer are compressed 10.16 cm under its weight.

Find the critical speed when the trailer is traveling over a road with a profile approximated by a sine wave of amplitude 7.62 cm and wavelength of 14.63 m.

What will be the amplitude of vibration at 64.4 km/h? (Neglect damping.)

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