Which of the following quantities remain constant in a planetary motion, when seen from the surface of the sun?
Speed
Angular speed
Kinetic energy
Angular momentum
A
Angular speed
B
Kinetic energy
C
Speed
D
Angular momentum
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Solution
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When viewed from the inertial frame of the sun, the planets seem to execute elliptical orbital motion with changing (K.E) (Kepler's first law) but constant angular momentum (due to the force being central).
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