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On a frictionless horizontal plane, a bob of mass 0.1kg is attached to a spring with natural length l0=0.1mm. The spring constant is k1=0.009N/m when the length of the spring l (greater than) l0 and is k2=0.016N/m when l (less than) l0. Initially the bob is released from l=0.15m. Assume that Hooke’s Law remains valid throughout the motion. If the time period of one full oscillation is T=n(pi) seconds, then the integer closest to n is _______.

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