A mass $m$ is suspended by means of two coiled spring which have the same length in unstretched condition as in figure. Their force constant are $k_1$ and $k_2$ respectively. When set into vertical vibrations, the period will be
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(d) Given spring system has parallel combination, so
${k_{eq}} = {k_1} + {k_2}$ and time period $T = 2\pi \sqrt {\frac{m}{{({k_1} + {k_2})}}} $
${k_{eq}} = {k_1} + {k_2}$ and time period $T = 2\pi \sqrt {\frac{m}{{({k_1} + {k_2})}}} $
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