The amplitude of vibration of the spring would be 24 cm.
It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.
It is the total length of the wave for which it completes one cycle.
The wavelength is inversely proportional to the frequency of the wave as from the following relation.
Due to the fact that the length between the highest and the lowest locations and the mean position is equal. As a result, the distance between the lowest and highest points must be twice the wave's amplitude.
Thus, The amplitude of vibration of the spring would be 24 cm.
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