A block of mass \( m \) is released from rest at a height \( R \) above a horizontal surface. Th...

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A block of mass \( m \) is released from rest at a height \( R \) above a horizontal surface. The acceleration due to gravity is \( g \). The block slides along the inside of a frictionless circular hoop of radius \( R \).

Which one of the following expressions gives the speed of the mass at the bottom of the hoop?
(A) zero \( \mathrm{m} / \mathrm{s}^{2} \)
(B) \( v=\frac{m g}{2 R} \)
(C) \( v^{2}=2 g R \)
(D) \( v=m g R \)
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