What is the period of small oscillations of the block of mass $m$ if the springs are ideal and pulleys are massless ?
  • A$\frac{\pi }{2}\sqrt {\frac{m}{k}}$
  • B$\frac{\pi }{2}\sqrt {\frac{m}{2k}}$
  • C$\frac{\pi }{2}\sqrt {\frac{2m}{k}}$
  • D$\pi \sqrt {\frac{m}{{2k}}}$
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