Astone is swinging in a horizontal circle $0.8\, m$ in diameter at $30 \,rev / min.$ Adistant horizontal light beam causes a shadow of the stone to be formed on a nearly vertical wall. The amplitude and period of the simple harmonic motion for the shadow of the stone are
  • A$0.4\ m, 4\ s$
  • B$0.2\ m. 2\ s$
  • C$0.4\ m, 2\ s$
  • D$0.8\ m, 2\ s$
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