Correct Option: A

K.E. of satellite moving in an orbit around the earth  is

K =	1	mv2 =	1	m		√GM / r		2	=	GMm
	2		2							2r

P.E. of satellite and earth system is

U =	GMm	⇒	K	=	GMm
					2r			=	1
	r		U		GMm		2
					r