A body of mass \( m \mathrm{~kg} \). starts falling from a point \( 2 R \) above the Earth's sur...

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A body of mass \( m \mathrm{~kg} \). starts falling from a point \( 2 R \) above the Earth's surface. Its kinetic energy when it has fallen to a point ' \( R \) ' above the Earth's surface [R-Radius of Earth, \( M \) Mass of Earth, G-Gravitational Constant] [MP PMT 2002]
(a) \( \frac{1}{2} \frac{G M m}{R} \)
(b) \( \frac{1}{6} \frac{G M m}{R} \)
(c) \( \frac{2}{3} \frac{G M m}{R} \)
(d) \( \frac{1}{3} \frac{G M m}{R} \)
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