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Q.

Mass less spring was suspended from rigid support and another end is attached to certain mass, it expands by 10 cm under equilibrium. Further it is pulled by 2 cm and released it makes an oscillations with a time period of (g= 10 m/s2)

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a

π2sec

b

π5sec

c

2π

d

πsec

answer is C.

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Detailed Solution

At equilibrium, 

mg=kx

⇒k=mgx=100m

Time period is

T = 2πmk=2π1100

T=π5sec

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