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NEET 2006 Physics question

PhysicsGravitationNEET 2006

The Earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the Earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The value of f is:-

Answer: (2)

Solution

Escape speed from the surface: . From the platform the distance from the centre is . By conservation of energy: . $f =

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Question ID VK-089568