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NEET Physics · Hard

Gravitation: Gravitation Mixed MCQ

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Gravitation MixedHardQuestion 6298

Question

Energy needed to lift 1 kg from surface to infinity (g=10 m/s², R=6.4×10⁶ m):
  1. A
    6.4×10⁷ J
    Correct
  2. B
    3.2×10⁷ J
  3. C
    9.8×10⁷ J
  4. D
    1.28×10⁸ J

Correct answer

6.4×10⁷ J

Explanation

E = GMm/R = mgR = 1×10×6.4×10⁶ = 6.4×10⁷ J.

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