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When a mass m attached to a spring it oscillates with period 4s. When an additional mass of 2 kg is attached to a spring, time period increases by 1s.

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When a mass m attached to a spring it oscillates with period 4s. When an additional mass of 2 kg is attached to a spring, time period increases by 1s. The value of m is :-
A. 3.5 kg
B. 8.2 kg
C. 4.7 kg
D. 2.6 kg
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Correct Answer - A
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