P-1 Space Missions — Science STD 10 — Question

where,
m: mass of the satellite
υ_c: critical velocity of the satellite
h: height of the satellite from the surface of the earth
M: mass of the earth
R: radius of the earth
G: gravitational constant
$\begin{aligned} & \therefore v_{ c }^2=\frac{G M}{R+h} \\ & \therefore v_{ c }=\sqrt{\frac{G M}{R+h}}\end{aligned}$
Thus, if the value of h changes, the value of υ_c also changes. It means a satellite needs to be given a specific velocity (in the tangential direction) to keep it revolving in a specific orbit.