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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