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A body mass m is attached to the lower and of a spring whose upper end is fixed. The spring has neglible mass. When the mass m is slightly pulled down and released, it osocillates with a time period of 3.s When the mass m is increased by 1 kg. the time period of oscillations becomes 5.s The value of m in kg is

(a) 34                (b)43

(c) 169               (d) 916

 

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