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A body of mass 12 kg is suspended by a coil spring of natural length 50 cm and force constant 2.0 x 103 N/m. What is the stretched length of the spring? If the body is pulled down further stretching the spring to a length of 5.9 cm and then released. What is the frequency of oscillation of the suspended mass? (Neglect the mass of the spring). 

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Here, m = 12 kg, original length l = 50 cm 

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