According to Saints Director of Sports Science, Alvin Kamara's acceleration is....

Well, you just had to bring it up...

https://simplifaster.com/articles/nfl-speed/
(I just skimmed that article and Acceleration as talked about here is measured going from one speed to another. That is, not necessarily from a stop to a certain distance.)

Fantastic article, and something I've known for a long, long time.....

Sometimes players are both straight line fast and quick, and sometimes they are straight line fast and not that quick.....straight line speed does not equal quickness, not by a long shot.....It's why so many of the great WRs weren't "burners".....40 time isn't a useless metric but it is the most overused, overhyped, overrated one.....10 yard acceleration and how quickly one can change direction is the absolute key....IMO....