15. A moon has an elliptical orbit about the planet as shown above. At point A, the moon has speed VA and is at a distance rA from the planet. At point B, the moon has a speed of vg. Which of the following correctly explains the method for determining the distance of the moon from the planet at point B in the given quantities? (A) Conservation of angular momentum, because the gravitational force exerted by the moon on the planet is the same as that exerted by the planet on the moon I (B) Conservation of angular momentum, because the gravitational force exerted on the moon is always directed toward the planet (C) Conservation of energy, because the gravitational force exerted on the moon is always directed toward the planet (D) Conservation of energy, because the gravitational force exerted by the moon on the planet is the
15. A moon has an elliptical orbit about the planet as shown above. At point A, the moon has speed VA and is at a distance rA from the planet. At point B, the moon has a speed of vg. Which of the following correctly explains the method for determining the distance of the moon from the planet at point B in the given quantities? (A) Conservation of angular momentum, because the gravitational force exerted by the moon on the planet is the same as that exerted by the planet on the moon I (B) Conservation of angular momentum, because the gravitational force exerted on the moon is always directed toward the planet (C) Conservation of energy, because the gravitational force exerted on the moon is always directed toward the planet (D) Conservation of energy, because the gravitational force exerted by the moon on the planet is the
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