However, here is only need the amplitude of driving oscillation. If you drive a car, you spring compresses 20cm due to car weight and you face bump(20cm*20cm) periodic, your car is running 20km/h
But we are told, counter-factually, that the resulting oscillation is different. Either I am missing something or the problem statement is. [And we still have the problem that the driving oscillation is not specified in the problem statement]However, here is only need the amplitude of driving oscillation.