A force of $6.4\  N$ stretches a vertical spring by $0.1\ m$. The mass that must be suspended  from the spring so that it oscillates with a time period of $\pi/4\  second$ is .... $kg$
  • A$\frac{\pi }{4}$
  • B$\frac{4 }{\pi}$
  • C$1$
  • D$10$
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