Calculating Energy in Orbital Motion

[justinh8]

Homework Statement

A 5.00 x10^2-kg satellite is in circular orbit 2.00 x 10^2 km above Earth’s surface.
Determine the gravitational potential energy of the satellite
Determine kinetic energy
Determine The Binding Energy

The Attempt at a Solution

I solved for gravitational potential and kinetic energy but for the binding energy i get a positive number when the answer is negative. Doesnt Binding energy = -Total energy and because the total energy will be negative, the negative times a negative will make it positive Please give me some insight

 

[jbsteele]

. Gravitational potential energy = -3.9 x 10^10JKinetic Energy = 4.0 x 10^10JBinding Energy = 7.9 x 10^10J