Questions

A body attains a height equal to the radius of the earth. The velocity of the body with which it was projected is

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3GMR

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detailed solution

Correct option is A

Applying the law of conservation of energy,, we have12mu2−GMmR=12m(0)2−GMmR+Ror u2=2GMR−2GM2R=GMR∴ u=(GM/R)

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