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

  • A

    $3.5$

  • B

    $8.2$

  • C

    $4.7$

  • D

    $2.6$

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