Question

two satellites s1 and s2 are orbiting around a planet of radius R. s1 moves just above the surface and s2 is an orbit of radius 4R. the value of the orbital speed of s1/orbital speed of s2 is?

Answer 1

The orbital speed for a circular orbit is given by\[v = \sqrt{GM/r}\]
M= mass of the planet.
r= radius of orbit

For s1 , r=R
For s2 ,r=4R