Calculate velocity with drag

I have a rigidbody, mass of 1, and a drag of .6. There is no gravity. A constant force of 1 is applied to the object…

How would I calculate what its velocity/magnitude would be?

Is there a reason you couldn’t use rigidbody.velocity? Are you trying to calculate it ahead of time?

Yes, I’d like to know ahead of time.

It;s actually quite difficult to get in a formula. You are better off building a table from a sim and looking up into it with a little interpolation.