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Question 30710
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Gravitation: Kepler's Second Law MCQ

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Kepler's Second LawEasyQuestion 30710

Question

Kepler's second law (equal areas in equal times) implies that a planet:
  1. A
    Moves fastest at aphelion
  2. B
    Moves fastest at perihelion
    Correct
  3. C
    Moves at constant speed
  4. D
    Has constant angular acceleration

Correct answer

Moves fastest at perihelion

Explanation

Equal areas → conservation of angular momentum (L = mvr = constant). At perihelion (closest), r is smallest, so v must be largest. At aphelion (farthest), v is smallest.

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