Algodoo

arrows = slight thrust in all directions
shift arrow up = full main thrust (it is impossible to take off and land without it)
o = open cargo hatch
c = close cargo hatch

Mission:
– take off
– bring rocket into a stable orbit
– open cargo hatch (hold c until it is open wide enough)
– release satellite (tip left arrow)
– close cargo hatch (hold c until it is in proper position)
– land on platform

It helps to adjust the zoom during the mission.

Enjoy!

For advanced user:
– try to bring back the satellite back to the green world
(never made it, maybe you have more patient)