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Question

In figure shown, the spring constant is k. The mass of the upper block is m and that of the lower back is 3m. The upper block is depressed down from its equilibrium position by a distance δ and released at t = 0.

The value of δ for which the minimum normal reaction on 3m from ground is less than mg is


A

3mg/2k

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B

5 mg/2k

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C

3mg/k

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D

mg/2k

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Solution

The correct option is C

3mg/k


mg+k(δmgk)=3mg or δ=3mgk


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