Two satellites of same mass m are revolving round of earth (mass M) in the same orbit of radius r. Rotational directions of the two are opposite therefore, they can collide. Total mechanical energy of the system (both satallites and earths) is `(m lt lt M)` :-

Options

A. `-("GMm")/( r )`
B. `-(2"GMm")/( r )`
C. `-("GMm")/(2r)`
D. Zero

Answer

A