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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 the direction of vector `vec(L)` will continuously change

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The correct Answer is:
C
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