In arrangement given in figure, if the block of mass m is displaced, the frequency is given by
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(b)With respect to the block the springs are connected in parallel combination.
$\therefore $ Combined stiffness $k = k_1+ k_2$ and $n = \frac{1}{{2\pi }}\sqrt {\frac{{{k_1} + {k_2}}}{m}} $
$\therefore $ Combined stiffness $k = k_1+ k_2$ and $n = \frac{1}{{2\pi }}\sqrt {\frac{{{k_1} + {k_2}}}{m}} $
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