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Question 30436
JEE Physics · Hard

Work, Power and Energy: Escape KE MCQ

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Escape KEHardQuestion 30436

Question

The minimum kinetic energy needed to project a body of mass m from Earth's surface to infinity (escape) is:
  1. A
    mgh
  2. B
    ½mgR
  3. C
    mgR
    Correct
  4. D
    2mgR

Correct answer

mgR

Explanation

Escape velocity v_e = √(2gR). KE = ½mv_e² = ½m×2gR = mgR.

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