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Let the speed of the planet at the perihelion \( P \) in above figure be \( v_{P} \) and the sun planet distance \( S P \) be \( r_{P} \). The corresponding quantity at the aphelion \( A \) is \( \left(r_{A}, v_{A}\right) \). The mass of the planet is \( m_{p} \).
The magnitude of the angular momentum at \( P \) is
(a) \( L_{P}=\frac{m_{P} r_{P}}{v_{P}} \)
(b) \( L_{P}=\frac{m_{P} v_{P}}{r_{P}} \)
(c) \( L_{P}=m_{P} r_{P} v_{P} \)
(d) \( L_{P}=m_{P} v_{P} \)
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