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Question

A body of mass m hangs from three springs, each of spring constant K, as shown. If the mass is slightly displaced and released, the system will oscillate with time period of

A
2πm3K
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B
2π3m2K
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C
2π2m3K
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D
2π3Km
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Solution

The correct option is B 2π3m2K
Let K2 be equivalent resistance of two springs in parallel
K2=K+K=2K
As K2 is in series with third spring of spring constant K

Keq=K×K2K+K2=K×2KK+2K=23K

Using T=2πmKeq

T=2πm2K3

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