$A$ spring executes $S.H.M.$ with a mass of $1 \,kg$ attached to it. The force constant of the spring is $4 \,N/m$. If at any instant its velocity is $20 \,cm/s$, the displacement at that instant is (Amplitude of $S.H.M.$ is $0.4 \,m$)
- A$\sqrt{0.11} \,m$
- B$\sqrt{0.15} \,m$
- C$\sqrt{0.17} \,m$
- D$\sqrt{0.19} \,m$
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