Posted by Sanjna on .
Two satellites are in circular orbits around the earth. The orbit for satellite A is at a height of 360 km above the earth's surface, while that for satellite B is at a height of 720 km. Find the orbital speed for each satellite.

Physics 
bobpursley,
Kepler's laws related period to radius. Another way, ...
g(re/(re+alt))^2=v^2/(re+ alt) and you can solve for v. 
Physics 
Sanjna,
thank you