What is the air bag deployment speed in a car accident for a 1995 Nissan altima?

Different OEs have different deployment command criteria, and 1995 was well before CFR T49 part 563 set forth some specifications. You probably would have to contact Nissan for an answer... Good luck with that! This is a case where consulting with a collision reconstructionist such as myself may be able to help you by looking for some actual crash tests with a 95 Altima