A small body is released from a height \( H \) of an inclined plane. At the bottom of the plane ...

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A small body is released from a height \( H \) of an inclined plane. At the bottom of the plane is a loop of radius \( R \) as shown: ignoring friction, the minimum \( H \) required for the body to just complete the loop (that is, reach the point \( O \) ) is
[KVPY 2009]
(a) \( 2 R \)
(b) \( \frac{5 R}{2} \)
(c) \( 3 R \)
(d) \( \frac{7 R}{2} \)
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