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For a planet moving around the sun in an...

For a planet moving around the sun in an elliptical orbit of semi-major and semi-minor axes a and b respectively and period T

A

the torque acting on the planet about the sun is non zero

B

the angular momentum of the planet about the sun is constant.

C

the planet moves with a constant speed around sun.

D

the areal velocity is a `pi ab/T`

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