A thin ring, a disk and an annular cylinder, of same mass $M$, are released from a point 3.6 m from the ground up an inclined plane of $30^{\circ}$ inclination. The ring and the disk have the same radius $R$. For the annular cylinder, the outer radius is $R$ and the inner radius is $R / 2$. Times taken by the ring, disk and annular cylinder, respectively, to reach the ground are in the ratio,

• Correct answer
  A

  $\sqrt{2}: \sqrt{1.5}: \sqrt{1.6}$
• B

  $\sqrt{1.4}: \sqrt{1.5}: \sqrt{2}$.
• C

  $\sqrt{2}: \sqrt{1.5}: \sqrt{1.5}$
• D

  $\sqrt{1.4}: \sqrt{1.5}: \sqrt{1.6}$

Hence, the correct answer is option: 'A'.