If a satellite is revolving around a planet of mass m in an elliptical orbit of semi major axis .a. the orbitral speed of the satellite when it is at a distance r from the focus is

If a satellite is revolving around a planet of mass m in an elliptical

1.	If a satellite is revolving around a planet of mass m in an elliptical orbit of semi major axis .a. the orbitral speed of the satellite when it is at a distance r from the focus is
Answer» `sqrt(GM[(2)/(R)-(1)/(a)])` `sqrt(Gm[(2)/(r^(2))-(1)/(a)])` `sqrt(Gm[(2)/(r^(3))-(1)/(a)])` `sqrt(Gm[(2)/(r)-(1)/(a)])` Answer :A