Question

So if I have a rocket going to a certain height - I know its mass, and I know its total impulse, and the height it reaches -how do I calculate for another height? For example, 50Ns is total impulse, mass is 550g, and height is 750m. How do I calculate the impulse needed to reach 850m? This problem isn't in my homework, so I'm not interested in the solution, just its pathway.