A mass $M$ is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes $S.H.M.$ of time period $T$. If the mass is increased by m, the time period becomes $5T/3$. Then the ratio of $m/M$ is
  • A$\frac{5}{3}$
  • B$\frac{3}{5}$
  • C$\frac{{25}}{9}$
  • D$\frac{{16}}{9}$
AIEEE 2003,AIIMS 2016, Medium
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