Check the developer.roblox.com site: AlignPosition | Roblox Creator Documentation
As it states the value should be from 5 to 200, and the higher the number the quicker it snaps to the destination.
If your .magnitude is 1 then your Responsiveness will be 2.5.
If your .magnitude is 10 then your Responsiveness will be 25.
I’m pretty sure that changes to the Responsiveness when calculated and applied will not change during the coin’s movement though.