1. The problem statement, all variables and given/known data I've thought about a problem that I invented but couldn't solve it. So I'd like a very little help, something that can push me in the good direction but not the full answer. Suppose we have a system that is composed of a planet and a body. The body is at an height h from the center of the planet (of course h is greater than r). Initially the body is at rest. What is the impulse we have to apply on this body in order to make it move in such a way so that it describes a circular path around the planet? Give the answer in terms of m (the mass of the body), R (distance between the center of the planet and the body), M the mass of the planet and so on. With the impulse, I can then calculate the velocity it must have to accomplish this task. Thank you! 2. Relevant equations 3. The attempt at a solution I've tried a few things, but I'm at a loss.