The kinetic energy given to a body is K so that it moves from the surface of earth to infinity. If only 20 % of this kinetic energy is given to the same body on the surface of earth, it rises to height nR , where R is the radius of the earth. Then n is equal to

Q: The kinetic energy given to a body is K so that it moves from the surface of earth to infinity. If only 20 % of this kinetic energy is given to the same body on the surface of earth, it rises to height nR , where R is the radius of the earth. Then n is equal to

(a) 1

(b) 3/4

(c) 1/2

(d) 1/4

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Ans: (d)