1. The problem statement, all variables and given/known data a satellite of mass 200 kg is launched from a site on earth's equator into an orbit 200 km above the surface of earth. a) assuming a circular orbit , what is the orbital period of this satellite? b)what is the satellite's speed in it's orbit? c) what is the minimum energy necessary to place the satellite in orbit , assuming no air friction? 2. Relevant equations PE= -G*Me*m/r how does -γMm/(R+r) become GmR²/(R+r) 3. The attempt at a solution I did both parts a and b just 100% stuck on part c..no idea at all what to do :( ...This makes me frustrated...really!!!