A

$25.$ A satellite revolves around the Earth in a circular orbit with a mechanical energy of $-2{10}^{12}J.$ What is its kinetic energy?

a$)-5{10}^{11}J$

b$)+10{10}^{11}J$

$($c$)+20{10}^{11}J$

d$)+5{10}^{11}J$

e$)-20{10}^{11}J$