I think you allow us to make the context for you! This is even more fun!
You are on your routine work with a friend facing a (seemingly) difficult Physics problem, while preparing a successful expedition to Jupiter;
you need to define the temporary sequence of hydrazine engines thrusts for a quiet landing on those yet untouched landscapes;
you are more confident than your friend who is only a freshman at Las Vegas City college (nobody knows --- not even Nasa --- how he got a job for Nasa), so you say:
a) 'let's break it down',
b) 'let's break this computation down',
meaning: we try and we'll surely solve it, although we might have to struggle a little bit.
Within a few weeks, when everything seems ready, will you dare to step on that spaceship ?