Let $T_1$ and $T_2$ be the time periods of two springs $A$ and $B$ when a mass $m$ is suspended from them separately. Now both the springs are connected in parallel  and same mass $m$ is suspended with them. Now let $T$ be the time period in this position. Then
  • A$T = T_1+ T_2$
  • B$T =  \frac{T_1T_2}{T_1+ T_2}$
  • C$T^2 = T_1^2 + T_2^2$
  • D$\frac{1}{T^2} =\frac{1}{T_1^2}+\frac{1}{T_2^2}$
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