A body of mass m kg. starts falling from a point 2R 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]
(a) 1/4 (GMm /R) (b) 1/6 ( (GMm /R)
(c) 2/3 (GMm /R) (d) 1/3 (GMm /R)
Answer: b
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