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A mass M, attached to a spring oscillates with a period of 2 s. If the mass is increase by 4 kg,

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A mass M, attached to a spring oscillates with a period of 2 s. If the mass is increase by 4 kg, the time period increases by one second . Assuming that Hooke's law is obeyed, the initial mass M was 

(a) 3.2 kg

(b) 1 kg

(c) 2 kg

(d) 8 kg

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Correct option (a) 3.2 kg

Explanation :

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