A planet orbits a star. The perigee,
namely the shortest distance between the planet and the star is P.
The apogee, namely the longest distance between the planet and the
star is A. When
the planet is on the distance R
from the star (P ≤R≤A),
the speed of the planet is V.
What is its speed VP
when the planet passes the perigee? Find an expression for VP
in terms of P, A,
V,
R.
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