A mass $m$ attached to a spring oscillates with a period of $3\,s$. If the mass is increased by $1\,kg$ the period increases by $1\,s$. The initial mass $m$ is
  • A$\frac{7}{9}\,kg$
  • B$\frac{9}{7}\,kg$
  • C$\frac{14}{7}\,kg$
  • D$\frac{18}{7}\,kg$
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