A planet is moving in an elliptical orbit. If \( T, U, E \) and \( L \) are its kinetic energy, ...

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A planet is moving in an elliptical orbit. If \( T, U, E \) and \( L \) are its kinetic energy, potential energy, total energy and magnitude of angular momentum respectively, then which of the following statement is true :-
(1) \( T \) is conserved
(2) \( U \) is always positive
(3) \( E \) is always negative
(4) L is conserved but the direction of vector \( \vec{L} \) will continuously change
\( \mathrm{P} \)
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