Based on fundamental laws of motion and gravity, which of the following best explains why Kepler's second law (planets move faster in the parts of their orbit that are closer to the Sun and slower when they are farther from the Sun) is true?
A) A planet's angular momentum must be conserved as it moves around its orbit.
B) The speed of a planet at any point in its orbit depends on its temperature, which varies with distance from the Sun.
C) The strength of gravity is inversely proportional to the square of the distance between two objects.
D) The gravitational influence of other planets determines the speed of any particular planet's orbit.
A) A planet's angular momentum must be conserved as it moves around its orbit.
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