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Question

On a smooth inclined surface a body of mass M is attached between two spring. The other ends of the springs are fixed to firm supports. If each spring ahs force constant k, the period of oscillation of the body is
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A
2π(2Mgk)1/2
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B
2π(M2K)1/2
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C
2π(2Mk)1/2
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D
2π(Mgsinθ2k)
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Solution

The correct option is B 2π(M2K)1/2
As we know,
T=2πMKeff

now as spring block system is inclinesd ,only initial equillibrium position is changed , after achieving equillibrium, if a small displacement is given then it will behave as a simple spring block system.
now
Keff=K+K=2K
so,
T=2πM2K

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