is your animation keyframed, or is it a dynamic simulation in maya?
Dynamic sims in maya allow for a per frame attribute as it were, that will let you slow the simulation its self down
I.E. you can have frame 1=1....then frame 50=50...and if you need it to kick into slow motion there, have frame 51= frame 51 then say....frame 200=100, which will basically give you 149 frames in slow mo for the next 50 frames in real time. i think the setting is called "per frame" or somethign, been a while since i screwed with it. It you're doing a dyncami sim lemme know and i'll look it up for you.