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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Dr suman 1 Best Answer
see the attached file.
when we take ideal spring mass system in which the spring density is uniform through out its length then mass of the spring is taken as its effecive mass which is one third of its actual mass. https://en.wikipedia.org/wiki/Effective_mass_(spring-mass_system)#Vertical_spring-mass_system