A spring of force constant k is cut into two parts whose lengths are in the ratio 1:2. The two parts are now connected in parallel and a block of mass m is suspended at the end of the combined spring. The period of oscillation of the block is:
A
2π√2m9k
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B
2π√m9k
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C
2π√2m5k
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D
2π√m5k
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