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A planet is moving in an elliptic orbit. If {T},{V},{E} and {L
Question

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