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In the adjacent figure, if the incline plane is smooth and the springs are identical, then the period of oscillation of this body is
  • A$2 \pi \sqrt{\frac{M}{2 k}}$
  • B$2 \pi \sqrt{\frac{2 M}{k}}$
  • C$2 \pi \sqrt{\frac{M}{k \sin \theta}}$
  • D$2 \pi \sqrt{\frac{M \sin \theta}{k}}$
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