Physics

Problem

A satellite of mass

m

revolves in a stable circular orbit of radius

r

around a planet of mass

M

. Which of the following gives its total mechanical energy

E

? a)

-\dfrac{G M m}{4 r}

+\dfrac{G M m}{2 r}

-\dfrac{G M m}{2 r}

-\dfrac{G M m}{r}