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A planet is moving in an elliptic orbit....

A planet is moving in an elliptic orbit. If `T,V,E` and `L` stand, respectively, for its kinetic energy, gravitational potential energy, total energy and angular momentum about the centre of force, then

A

`T` is conserved

B

`U` is always positive

C

`E` is always negative

D

`L` is conserved but direction of vector `L` changes continuously

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The correct Answer is:
C
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