Question

a satellite doesnot need any energy to revolve around the earth, why?​

Answer 1

Answer:

because there is no gravity to over come and the rotation is provided by the attraction between earth and sattilite it intuen provide centripetal force

Answer 2

Answer:

Satellites do need energy in order to get to the point where they can orbit, but do not need additionally energy when they get there for a good reason. ... The air molecules hit the molecules of the ball, taking away energy and slowing the ball down to a stop.