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Q.

An elastic spring, suspended vertically gets extended in length by i, when a mass M is attached at other end. What will be the period of vibration of the spring when a mass m is attached at the lower end ?

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a

2πlg

b

2πMlmg

c

2π(Mg/ml)

d

2π(ml/Mg)

answer is D.

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Detailed Solution

kl=Mg  or  k=Mg/l  Now T=2πmk=2πm(Mg/l) =2πmlMg
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