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## Homework Statement

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?

## Homework Equations

PE= -G*Me*m/r

how does

-γMm/(R+r) become GmR²/(R+r)

## 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!!!

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