For the spring-mass system shown in the given Fig.27, the frequency of oscillations of the block along the axis of the spring is

(a) \(\frac{1}{2 \pi} \sqrt{\frac{k_{1}-k_{2}}{m}}\)

(b) \(\frac{1}{2 \pi} \frac{\sqrt{k_{1} k_{2}}}{\left[\left(k_{1}+k_{2}\right) m\right]^{1 / 2}}\)

(c) \(\frac{1}{2 \pi} \sqrt{\frac{k_{1}+k_{2}}{m}}\)

(d) \(\frac{1}{2 \pi} \sqrt{\frac{m}{k_{1}+k_{2}}}\).

K www m www Fig.27