A satellite is revolving around a planet of mass M in an elliptical orbit of semi-major axis a. The orbital velocity of the satellite at a distance r from the focus will be

Options :

1. [GM(2/r - 1/a)]⁰.⁵

2. [GM(1/r - 2/a)]⁰.⁵

3. [GM(2/r² - 1/a²)]⁰.⁵

4. [GM(1/r² - 2/a²)]⁰.⁵