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On a frictionless horizontal plane , a b...

On a frictionless horizontal plane , a bob of mass m = 0.1 kg is attached to a spring with natural length `l_(0) = 0.1 ` m . The spring constant is `k_(1) = 0.009 Nm^(-1)` when the length of the spring `l gt l_(0)` and is `k_(2) = 0.016 Nm^(-1)` when `l lt l_(0)` .Initially the bob is released from l = 0.15 m .Assume that Hooke's law remains valid throughout the motion . If the time period of the full oscillation is T =`(n pi)` s, then the integer closest to n is _____.

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