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

Q: 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

(a) 1/3

(b) 1/2

(c) √2

(d) 1/√2

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Ans: (d)