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Two identical springs are attached to a small block P. The other ends of the springs are fixed at A and B. When P is in equilibrium the extension of top spring is 20 cm and extension of bottom spring is 10 cm. The period of small vertical oscillations of P about its equilibrium position is (use g=9.8 m/s2

a
2π7sec
b
π7sec
c
2π5sec
d
none of these

detailed solution

Correct option is B

Mg=k×20−k×10⇒ k=mg10/100N/mT=2πMk =2π149×4=π7sec

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