OrbitVel2D:

Path: Orbit/OrbitMechanics

% Compute (VF,gammaF) at hF from (v0,gamma0) at h0. 
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   Form:
   [VF, gammaF, a, e, H] = OrbitVel2D( v0, gamma0, h0, hF, rE, mu )
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   ------
   Inputs
   ------
   v0         (1,:)     Initial velocity (km/s)
   gamma0     (1,:)     Initial flight path angle (rad)
   h0         (1,:)     Initial altitude (km)
   hF         (1,:)     Final altitude for orbit (km)
   rE         (1,1)     Planet radius (km) (earth is the default)
   mu         (1,1)     Gravitational potential (km^3/s^2) (earth is the default)

   -------
   Outputs
   -------
   vF         (1,:)     Velocity at hF (km/s)
   gammaF     (1,:)     Flight path angle at hF (rad)
   a          (1,:)     Orbit semi major axis (km)
   e          (1,:)     Orbit eccentricity
   H          (1,:)     Orbit angular momentum, (km^2/s)

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