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Physics Question on Gravitation

The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are KA, KB and KC, respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then

A

KB > KA > KC

B

KA < KB < KC

C

KB < KA < KC

D

KA > KB > KC

Answer

KA > KB > KC

Explanation

Solution

As per, Kepler's Law - dAdtdA \over dt = constant

As dA/dt is constant, point A is perihelion and C is aphelion.

So, KA > KB > KC

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