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 period of $\left( {\frac{\pi }{4}} \right)sec$. is  ... $kg$
  • A$\left( {\frac{\pi }{4}} \right)$
  • B$1$
  • C$\left( {\frac{1}{\pi }} \right)$
  • D$10$
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