An artificial satellite revolves it’s orbit around the earth without using any fuel. But an aeroplane requires fuel to fly off at a certain height, Why so ?

Explanation

It is given that `V_0=1//2V_e sqrt((GM)/(R+h)=1//2sqrt((2GM)/R)therefore(GM)/(R+h)=^1//4 (2GM)/R=(GM)/(2R)therefore 2R=R+h`